JP7652630B2 - Work management device and radiation exposure dose calculation method - Google Patents

Description

The present invention relates to a work management device and a radiation exposure dose calculation method that support the creation of plans for work performed in a radiation environment.

There are several thousand workers engaged in decommissioning work at the Fukushima Daiichi Nuclear Power Plant, and the radiation exposure dose of each worker is managed individually. A maximum limit is set for the amount of radiation exposure each worker can receive per year, and once that limit is reached, they are no longer able to work. For this reason, it is necessary to create work plans that optimize the amount of radiation exposure and processes for each worker, and to manage radiation exposure doses in a meticulous manner.

According to the work planning support method described in Patent Document 1, a dose map is created by overlaying a two-dimensional dose rate distribution calculated based on actual dose rate measurement data onto a three-dimensional image, and the worker's actions and behavior are overlaid on the created dose map, making it possible to estimate the radiation exposure dose of workers in a radiation environment more accurately than ever before.

The work support device described in Patent Document 2 acquires the position of the worker within a radiation controlled area and the measurement value of the radiation dosimeter, and compares it with information relating the work location and the work item to collect the actual radiation exposure value for each work item. Based on the actual radiation exposure amount collected in this way, the work support device estimates the radiation exposure amount with high accuracy.

JP 2000-162368 A JP 2004-264161 A

The work plan support method described in Patent Document 1 takes into account the movements and behavior of workers, but does not take into account the physical characteristics and skill characteristics of individual workers, and there is room for improvement in estimating radiation exposure.The work support device described in Patent Document 2 estimates radiation exposure based on actual values when the work is performed, so it cannot estimate radiation exposure for unprecedented work.
The present invention has been made in consideration of the above background, and has an objective of providing a work management device and a radiation dose calculation method that enable to estimate with high accuracy the radiation dose of workers performing work.

In order to solve the above-mentioned problems, the work management device of the present invention includes a dose calculation unit that calculates the exposure dose of a three-dimensional model by accumulating the amount of radiation from a radiation source irradiated to each surface that constitutes the surface of the three-dimensional model that simulates the movements of a worker in a three-dimensional virtual space that reproduces a work space, and the amount of radiation irradiated from the radiation source to the surface of the three-dimensional model is calculated including attenuation due to the work clothes of the worker.
The work management device of the present invention includes a dose calculation unit that calculates the exposure dose of a three-dimensional model by accumulating the amount of radiation from a radiation source irradiated to each face that constitutes the surface of the three-dimensional model that simulates the movements of a worker in a three-dimensional virtual space that reproduces a work space, an operation unit that accepts operations including movement on the three-dimensional model, and a display control unit that displays an image that visualizes the dose in the work space as seen from the viewpoint of the three-dimensional model that operates in accordance with the operation .

The present invention provides a work management device and a radiation dose calculation method that enable highly accurate estimation of radiation doses of workers performing work. Problems, configurations, and effects other than those described above will become clear from the description of the embodiments below.

1 is a functional block diagram of a work management device according to an embodiment of the present invention; 4 is a procedure for using the work management device according to the present embodiment. 1 is an image in which the radiation amount in the working space according to the present embodiment is visualized using shading. 1 is a diagram showing a route from a start point to a work position according to the present embodiment; 10 is a flowchart of a dose calculation process according to the present embodiment.

<Overview of the Work Management Device>
The work management device in the form (embodiment) for carrying out the present invention will be described below. The work management device simulates work using a three-dimensional model (avatar) of a worker in a virtual three-dimensional work space. Through this simulation, the work management device estimates the worker's radiation exposure dose by accumulating the radiation dose irradiated on the surface of the three-dimensional model. The three-dimensional model is not simply a human-shaped three-dimensional model, but a model that reflects the physical characteristics, technical characteristics, and psychological characteristics of the worker, and the size of each worker is different, and the work time for the same work is different. Therefore, the radiation exposure dose can be estimated with higher accuracy than when the radiation dose is calculated by accumulating the radiation dose for each work place.

<Configuration of the work management device>
1 is a functional block diagram of a work management apparatus 100 according to this embodiment. The work management apparatus 100 is a computer, and includes a control unit 110, a storage unit 130, and an input/output unit 180. User interface devices such as a display, a keyboard, and a mouse are connected to the input/output unit 180. The input/output unit 180 may include a communication device, and may be capable of transmitting and receiving data to and from other devices. A media drive may also be connected to the input/output unit 180, and data may be exchanged using a recording medium.

<Configuration of the Work Management Device: Memory Unit>
The storage unit 130 includes storage devices such as a read only memory (ROM), a random access memory (RAM), and a solid state drive (SSD), etc. The storage unit 130 stores a building database 131, a dose database 132, a worker database 133, a work content database 134, a work plan database 135, an actual work database 136, a shielding object database 137, and a waste database 138.

The building database 131 stores information on the building to be used as the work site and the positions, sizes (dimensions), materials, etc. of structures within the building. The building database 131 stores information on, for example, walls, floors, doors, facilities, equipment, piping, etc.
The dose database 132 stores information such as the position of radiation measurement points within a building and the radiation dose (dose rate) at the measurement points, as well as the position of the radiation source and the radiation dose.

The worker database 133 stores information such as the physical characteristics, technical characteristics, psychological characteristics, work history, and radiation exposure dose for each worker. Physical characteristics are information related to height, weight, bone structure, muscles, eyesight, hearing, etc. Technical characteristics are information related to work experience, qualifications, working hours, etc. Psychological characteristics are information related to personality, such as rashness/cautiousness/attention, hasty/relaxed, etc. Work history is information related to work performed in the past, and radiation exposure dose is the radiation exposure dose during the work and the cumulative radiation exposure dose (e.g., annual cumulative).

The work content database 134 stores details of the work content (work procedures, work items) for each task. For example, for the task of removing the main body of the control rod drive mechanism, information is stored such as the operation details on the control rod drive mechanism control panel, the mounting of the control rod drive mechanism attachment on the trolley, the work procedures such as the position of the trolley, and the standard work time required to perform each work procedure.

The work plan database 135 stores information such as the scheduled date and time of planned work, the worker in charge, the estimated work time, and the estimated radiation exposure dose.
The actual work database 136 stores information such as the date and time of the work performed, the worker in charge, the work time, and the radiation exposure dose.

The shielding object database 137 stores information such as the dimensions, weight, and material of radiation shielding objects.
The waste database 138 stores information such as the shape of the radioactive waste, the location before and after the disposal operation, the disposal date and time (date and time the waste was moved), and the radiation dose.
In addition to the above databases, the storage unit 130 also stores a wearable equipment database that includes the materials, dimensions, thickness, and wearing positions of safety equipment, helmets, protective clothing, and the like worn by workers.

<<Procedure for using the work management device>>
Before describing the functional units of the control unit 110, a procedure for using the work management device 100 by a work manager will be described. Fig. 2 shows the procedure for using the work management device 100 according to this embodiment. In the following description, it is assumed that information related to buildings and structures, actual radiation dose measurements, information related to workers, and work content are already stored in a building database 131, a radiation dose database 132, a worker database 133, and a work content database 134, respectively.

In step S11, the work manager inputs, as a work plan, into the work management device 100, information about which worker will be in charge of which work.
In step S12, the work manager instructs the work management device 100 to calculate the radiation exposure dose. Upon receiving the instruction, the work management device 100 calculates the radiation exposure dose (estimated radiation exposure dose) for each worker and displays it on a display connected to the input/output unit 180. The work management device 100 displays not only the radiation exposure dose during work, but also the cumulative radiation exposure dose for each worker.

In step S13, the work manager checks the calculated radiation dose, and if the plan is appropriate (step S13→YES), the process proceeds to step S14, and if the plan is inappropriate (step S13→NO), the process returns to step S11. If the plan is inappropriate, the work manager changes the worker or reviews the work content, and inputs the work plan again (see step S11).
In step S14, the work manager instructs the workers to carry out the work. The workers carry out the work assigned to them that was input in step S11.

In step S15, the work manager monitors the work of the workers and inputs the work time for each work item (work procedure). The work manager also inputs the radiation exposure dose of the workers. The input work time and radiation exposure dose are stored in the worker database 133 and the actual work database 136.
In step S16, the work manager checks whether the work procedures (work contents) are appropriate by comparing the work time of each work procedure in the actual work displayed by the work management device 100 with the planned work time stored in the work content database 134. If the work procedures are inappropriate, the work manager reviews the work in the work content database 134.

<Configuration of the work management device: control unit>
Returning to FIG. 1 , the control unit 110 is configured to include a CPU (Central Processing Unit), and has a registration unit 111, a virtual space generation unit 112, a radiation source estimation unit 113, an avatar control unit 114, a dose calculation unit 115, an actual work management unit 116, a display control unit 117, and a movement path calculation unit 118.

The registration unit 111 stores the input information in the memory unit 130. For example, the registration unit 111 stores the dose (dose rate) measured at various locations in the building in the dose database 132, and the worker in charge of the work in the work plan database 135. The registration unit 111 also stores the actual work time in the actual work database 136, and the radiation dose to which the worker was exposed while working in the worker database 133 and the actual work database 136. The registration unit 111 also stores information such as the shape and position of the radioactive waste, the disposal date and time, and the radiation dose in the waste database 138.

The virtual space generation unit 112 generates a three-dimensional virtual space model (three-dimensional virtual space) of the work location (work space) within the building based on the information stored in the building database 131.
The radiation source estimation unit 113 estimates the position of the radiation source and the radiation dose based on the information stored in the dose database 132, and stores the estimation result in the dose database 132. The radiation source estimation unit 113 calculates the position of the radiation source and the radiation dose by performing reverse calculations from the doses measured at various points in the working space.

In addition, when there is radioactive waste that has been moved after its dose has been measured and stored in the dose database 132, the radiation source estimation unit 113 may estimate the radiation source by referring to the information in the waste database 138. In detail, the radiation source estimation unit 113 may estimate the position and radiation dose of the radiation source by adding the radiation source that has moved as waste in the waste database 138 to the position and radiation dose of the radiation source estimated from the information in the dose database 132. For example, the radiation source estimation unit 113 subtracts the dose of the waste that was at the position from the radiation dose of the position of the radiation source estimated from the information in the dose database 132.

The avatar control unit 114 generates a three-dimensional model (avatar) of the worker and operates the three-dimensional model according to the work procedures in the work content database 134. When generating the avatar, the avatar control unit 114 determines the size and shape of the avatar by referring to the physical characteristics of the worker, such as the height, weight, and bone structure, in the worker database 133. The avatar control unit 114 also controls the actions of the avatar, such as moving, turning, and changing the posture of the avatar within the three-dimensional virtual space, based on the work procedures in the work content database 134.

The avatar control unit 114 controls the avatar's movements during work by referring to the physical, skill, and psychological characteristics of the worker. For example, for movements involving load, the avatar control unit 114 controls to increase the movement speed of the avatar of a worker with strong muscles, which is one of the physical characteristics, and ultimately to shorten the work time. For example, for work experience, which is one of the skill characteristics, the avatar control unit 114 controls to shorten the work time of the avatar of a worker with much work experience, and to lengthen the work time of the avatar of a worker with little work experience.

For example, for the psychological characteristic of haste/cautiousness, the avatar control unit 114 controls the avatar to work longer in anticipation of redoing a task made by a worker with a high degree of haste, and to work longer for the avatar of a worker with a high degree of caution. For example, for the psychological characteristic of haste/relaxation, the avatar control unit 114 controls the avatar to work longer by increasing the movement speed of the avatar of a worker with a high degree of haste, to shorten the work time, and to work longer by decreasing the movement speed of the avatar of a worker with a high degree of leisurelyness.

The dose calculation unit 115 calculates the dose irradiated to the avatar. In detail, the dose calculation unit 115 calculates and integrates the dose irradiated to the avatar for each polygon (face) constituting the surface of the avatar (three-dimensional model) per unit time based on the position, orientation, and size of the polygon, the distance from the radiation source, attenuation due to structures, etc. to calculate the radiation exposure dose. The dose calculation unit 115 calculates the attenuation due to structures, etc. based on the position, size (thickness), and material of structures, shields, and worn clothing (work clothes) between the polygon and the radiation source.

Regarding the dose irradiated to the polygon, the dose decreases as the distance from the radiation source increases, and the dose also decreases if there is attenuation due to structures, etc. (i.e. the dose irradiated to the avatar decreases). Regarding the orientation of the polygon, if the polygon is not directly facing the radiation source (if it is at an angle), the dose is lower than if it is directly facing the source. Regarding the size of the polygon, if the polygon is small, the dose is lower than if it is large.

The actual work management unit 116 compares the work time in the work content database 134 before the work (at the time of work planning) with the work time and dose in the actual work database 136 after the work, and displays work procedures (work items) with a large discrepancy so that the work manager can easily recognize them.
The display control unit 117 generates an image in which the radiation amount in the working space is visualized in a three-dimensional virtual space, and displays the image on a display connected to the input/output unit 180. The display may be, for example, virtual reality (VR) goggles.

Figure 3 is an image 420 in which the dose (dose rate) in the work space according to this embodiment is visualized with shading. In detail, image 420 shows the dose on a vertical plane in the work space, and shows the dose on a cross section taken along line B-B in Figure 4 (a plane perpendicular to the floor) described below. The display control unit 117 may show the dose with color instead of shading. The radiation source is located behind pump 421 on the left side of image 420, and the dose decreases concentrically toward the outside. Furthermore, the doses of pump 421, piping 426, and valve 425 are slightly higher than those of the work space. It can be seen that radiation is blocked by shielding 422.

For avatars 423 and 424, the radiation dose of the avatar at the display position is shown. The left side of avatar 423 is hidden by shield 422 when viewed from the radiation source and has a low radiation dose, but the right side has a high radiation dose. Avatar 424 has a higher radiation dose overall than avatar 423. The display control unit 117 may additionally display the radiation dose (per unit time) of avatars 423 and 424 (see the numerical values "11.2" and "21.1").

Returning to FIG. 1, the movement path calculation unit 118 refers to the building database 131 and calculates the movement path of the worker (avatar) from the starting point to the work position. There is not necessarily one movement path, and there may be multiple movement paths. The avatar control unit 114 moves the avatar along the calculated path, and the dose calculation unit 115 calculates the radiation exposure dose during movement. The display control unit 117 displays the route with the lowest radiation exposure dose on the floor plan.

Figure 4 is a diagram showing a route 437 from a start point 432 to a work position 433 according to this embodiment. The location of the radiation source 431, the start point 432, the work position 433, and various structures are shown on the floor plan 430. The start point 432 is, for example, the entrance to the floor. There are three routes 435 to 437 as movement routes from the start point 432 to the work position 433. The route 436 is the shortest in terms of movement distance, but the radiation exposure dose during movement is the smallest for route 437, so the display control unit 117 does not display routes 435 and 436, but displays only route 437 on the display. The floor plan 430 shows the dose on the horizontal plane of the work space, and shows the dose on the A-A cross section in Figure 3 (a horizontal plane parallel to the floor). Ellipses 438 and 439 show the positions of the avatars 423 and 424 shown in Figure 3.

The floor plan 430 is a dose map that shows the dose (dose rate) at each location on the floor in shades of gray. The dose is higher the closer to the location where the radiation source 431 is located, but the dose is lower in locations that are shaded from the radiation source 431 by structures or shielding. The dose at each location shown on the dose map is calculated from the position of the radiation source, the radiation dose of the radiation source, and the material and size (thickness) of the structure between the radiation source and the location, just like the dose irradiated to the avatar. The dose map may show not only the dose at a location on the floor, but also the dose irradiated to an avatar at that location, reflecting the characteristics of the worker.

<Dose calculation process>
5 is a flowchart of a dose calculation process according to the present embodiment. A process of calculating an exposure dose of an avatar during work by the work management apparatus 100 from when a dose calculation is instructed to be displayed (see step S12 in FIG. 2) will be described with reference to FIG.
In step S21, the virtual space generation unit 112 generates a three-dimensional virtual space model (three-dimensional virtual space) of a work location in a building based on the information stored in the building database 131.

In step S22, the radiation source estimation unit 113 estimates the position of the radiation source and the radiation dose based on the information stored in the dose database 132, and stores the estimation results in the dose database 132.
In step S23, the avatar control unit 114 generates an avatar by referring to the physical characteristics of the worker.
In step S24, the dose calculation unit 115 sets the work exposure dose of the avatar to 0. The work exposure dose is the exposure dose received during work.

In step S25, the dose calculation unit 115 divides the work performed by the avatar (worker) into unit times. A unit time is a time during which the position, orientation, and posture of the avatar during the work can be considered to be almost constant, and even if the unit time is not constant, the time is short and can be considered an error from the overall radiation exposure dose due to the work.
In step S26, the dose calculation unit 115 starts repeating steps S27 to S28 for each unit time. Hereinafter, the unit time to be processed in the repeating process will be referred to as a target unit time.

In step S27, the avatar control unit 114 controls the avatar's movements, such as moving the avatar, changing its orientation, and changing its posture, within the three-dimensional virtual space based on the work procedure for the work for which the dose is to be calculated, which is stored in the work content database 134, and calculates the position, orientation, and posture of the avatar for the target unit time.

In step S28, the dose calculation unit 115 calculates the dose (exposure dose) irradiated to each polygon (face) constituting the surface of the avatar within the target unit time based on the position, orientation, and size of the polygon, the distance from the radiation source, attenuation due to structures, etc. Next, the dose calculation unit 115 adds the sum of the calculated exposure doses for each polygon to the work exposure dose of the avatar.

In step S29, the dose calculation unit 115 stores the work exposure dose of the avatar in the work plan database 135 as an estimated exposure dose for the work of the worker corresponding to the avatar.
In the above explanation, there is one avatar, but if multiple workers are working, the radiation dose is calculated and estimated for each avatar (worker). Also, if there are multiple tasks, the radiation dose is calculated and estimated for each task.

<Features of the work management device>
The work management device estimates the radiation dose of workers by calculating the radiation dose irradiated to an avatar that simulates work in a three-dimensional virtual space. The radiation dose irradiated from a radiation source to the surface of the avatar is calculated taking into account the distance from the radiation source, any obstructions between the radiation source and the avatar, and the orientation and posture of the avatar. The size, shape, and movement of the avatar also reflect the worker's physical characteristics, such as height and weight, technical characteristics, such as work experience, and psychological characteristics, such as caution and hastiness. Since the radiation dose is calculated using an avatar that reflects the characteristics of each individual worker, the work management device can estimate the radiation dose with high accuracy.

The work management device visualizes and displays radiation doses within the work space (see Figures 3 and 4). By viewing this, workers can imagine where in the work area radiation levels are high before they begin work, and become conscious of actions that will reduce radiation exposure while working. The work management device also displays routes to the work area that will result in the lowest radiation exposure doses (see Figure 4). By following the displayed routes, workers can minimize their radiation exposure dose.

The work management device calculates the radiation dose including the attenuation caused by shields between the radiation source and the avatar. In other words, it becomes possible to predict the reduction in radiation dose by placing a shield with a specified material, width, height, and thickness in the work space. The work management device also displays a dose map (see floor plan 430 in Figure 4) including the attenuation caused by structures and shields.

<<Variation: Simulation by operator operation>>
In the above embodiment, the radiation dose is calculated based on the position, orientation, and posture of the avatar as a result of the avatar control unit 114 controlling the avatar's movement. Instead of the avatar control unit 114, the worker may control (operate) the avatar using an operation device (operation unit) connected to the input/output unit 180. In this case, the operation of the worker is not necessarily reflected directly in the avatar's movement, and for example, the moving speed or the speed at which an object is moved may be limited according to the physical characteristics of the worker.

The display control unit 117 may calculate the position and posture of the avatar from the operation information for the avatar and physical characteristics obtained from the operation unit connected to the input/output unit 180, generate an image that visualizes the radiation dose in the work space seen from the viewpoint of the avatar, and output it to the VR goggles connected to the input/output unit 180. This image is not limited to an image overlooking the work space as shown in FIG. 3, but may be an image with a narrow field of view seen from the viewpoint of the avatar, for example, through VR goggles attached to protective clothing, or a field of view according to the eyesight, which is a physical characteristic.

The work management device may be configured to issue an alarm if the radiation dose is equal to or greater than a predetermined value. This radiation dose may be the radiation dose (dose rate) at the avatar's position, or the cumulative radiation exposure dose from the start of work. By simulating such work, workers can have a simulated experience of the work in advance, allowing them to carry out the actual work smoothly.

<<Variation: Navigation during work>>
The floor plan 430 (see FIG. 4 ) shows a route 437 from a start point 432 to a work position 433, which is displayed on a display connected to the work management device 100. The display control unit 117 may display the route 437 on a display of smart glasses or a head-mounted display worn by the worker so that the worker can check the route 437 during work. The displayed route may be a route displayed on the floor plan, or may be a route or a moving direction corresponding to the worker's field of view calculated from the position and orientation of the worker.

The display control unit 117 may display the dose (dose rate) at the worker's position along with the route. The dose may be calculated by the dose calculation unit 115, or may be measured by a dosimeter carried by the worker. The worker's position is calculated, for example, from measurements using an acceleration sensor or angular velocity sensor provided in smart glasses or a head-mounted display.

<<Variation: Acquiring information during actual work>>
In the above embodiment, the registration unit 111 acquires the work time and the radiation dose of the worker for each work procedure input by the work manager (see step S15). The registration unit 111 may acquire the work time and the radiation dose from an image of the work space acquired by a camera installed in the work space or from a dosimeter with a communication function carried by the worker.

In more detail, for example, the registration unit 111 may analyze the video of the work being performed using image recognition technology using machine learning technology, and obtain the work time for each work step from the worker's position, body orientation, posture, etc. In addition, at the same time as obtaining the work time, the dose sent from the dosimeter in real time or periodically may be integrated to calculate the dose for each work step. The position of the worker may be identified using positioning technology using GNSS (Global Navigation Satellite System) or beacons, rather than from the video.

Other Modifications
Although several embodiments of the present invention have been described above, these embodiments are merely illustrative and do not limit the technical scope of the present invention. The present invention can take various other embodiments, and various modifications such as omissions and substitutions can be made without departing from the gist of the present invention. These embodiments and modifications are included in the scope and gist of the invention described in this specification, etc., and are included in the scope of the invention described in the claims and their equivalents.

100 Work management device 111 Registration unit 112 Virtual space generation unit 113 Radiation source estimation unit 114 Avatar control unit 115 Dose calculation unit 116 Actual work management unit 117 Display control unit 118 Movement path calculation unit 180 Input/output unit (operation unit)
423, 424 Avatar (3D model)
430 Floor Plan (Radiation Dose Map)
431: radiation source 432: starting point 433: working position 435-437: path (movement path)

Claims (13)

a dose calculation unit that calculates an exposure dose of a three-dimensional model by integrating radiation doses from a radiation source irradiated onto each surface constituting a surface of the three-dimensional model that simulates the movement of a worker in a three-dimensional virtual space that reproduces a working space,
A work management device, comprising: a calculation unit that calculates a radiation amount irradiated from the radiation source to a surface of the three-dimensional model, the calculation including attenuation due to work clothes of the worker. a dose calculation unit that calculates an exposure dose of a three-dimensional model by integrating radiation doses from a radiation source irradiated onto each surface constituting a surface of the three-dimensional model that simulates the movement of a worker in a three-dimensional virtual space that reproduces a working space; and
an operation unit that receives an operation including a movement with respect to the three-dimensional model;
a display control unit that displays an image that visualizes a radiation dose in a work space seen from a viewpoint of the three-dimensional model that operates in accordance with the operation. The work management device according to claim 1 or 2, characterized in that the amount of radiation irradiated from the radiation source to the surface of the three-dimensional model is calculated including attenuation due to any of structures or obstructions that exist between the radiation source and the three-dimensional model within the three-dimensional virtual space. The work management device according to claim 1 , wherein the external shape of the three-dimensional model reflects physical characteristics of the worker. 3. The work management device according to claim 1, wherein the movement simulated by the three-dimensional model reflects at least one of a physical characteristic, a technical characteristic, and a psychological characteristic of the worker. The work management device according to claim 1 or 2, further comprising a radiation source estimation unit that estimates a position and a radiation dose of the radiation source from an actual measurement value of a dose in the work space. a display control unit that displays a dose map indicating a radiation dose at each position in the three-dimensional virtual space,
The work management device according to claim 1 , wherein the radiation amount is a radiation amount irradiated to the three-dimensional model at the position. A display control unit is further provided,
the dose calculation unit calculates a dose at each point in the three-dimensional virtual space, including attenuation due to any of a structure or a shield that exists in the three-dimensional virtual space and exists between the radiation source and the point;
The work management device according to claim 1 , wherein the display control unit displays a dose map of the work space including the dose. The work management device according to claim 2, characterized in that the display control unit issues an alarm when the radiation dose at the position to which the three-dimensional model is moved in accordance with the operation or the cumulative radiation dose from the start of the operation exceeds a predetermined value. Further comprising a travel route calculation unit and a display control unit,
the movement path calculation unit calculates a movement path of the three-dimensional model in the three-dimensional virtual space from a start point in the specified working space to a working position;
the dose calculation unit calculates an exposure dose of the three-dimensional model when the three-dimensional model moves along the movement path;
The work management device according to claim 1 , wherein the display control unit displays a travel route in which the radiation exposure dose is minimized among the travel routes. A movement path calculation unit is further provided,
the movement path calculation unit calculates a movement path of the three-dimensional model in the three-dimensional virtual space from a start point in the specified working space to a working position;
the dose calculation unit calculates an exposure dose of the three-dimensional model when the three-dimensional model moves along the movement path;
The work management device according to claim 2 , wherein the display control unit displays a travel route in which the radiation exposure dose is minimized among the travel routes. A radiation exposure dose calculation method executed by a work management device, comprising:
the work management device executes a step of accumulating radiation doses from a radiation source irradiated onto each surface constituting a surface of a three-dimensional model simulating the movement of a worker in a three-dimensional virtual space that reproduces a work space, and calculating an exposure dose of the three-dimensional model;
a radiation dose irradiated from the radiation source to a surface of the three-dimensional model is calculated taking into account attenuation due to work clothes of the worker. A radiation exposure dose calculation method executed by a work management device, comprising:
a step in which the work management device calculates an exposure dose of the three-dimensional model by integrating radiation doses from a radiation source irradiated onto each surface constituting a surface of the three-dimensional model simulating the movement of a worker in a three-dimensional virtual space that reproduces a work space;
receiving an operation including a movement with respect to the three-dimensional model;
and displaying an image that visualizes a dose in a working space seen from a viewpoint of the three-dimensional model operated in accordance with the operation.

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