JPS6016588B2 - Thermoluminescence dose reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoluminescence dose reading device for measuring the radiation exposure dose, and a thermoluminescence dose reading device that can quickly read the identification numbers of a large number of thermoluminescent elements and read the exposure dose. The present invention provides a dose collection device.

When the exposed thermal crab material (for example, CaS04:Tm, etc.) is heated, thermal crab rays are generated depending on the radiation exposure dose.

Therefore, by measuring this heat crab ray, it is possible to determine the radiation exposure dose. Generally, this type of device is called a thermoluminescence dose measurement device, and is used to manage radiation exposure of workers at nuclear power plants and the like. This thermoluminescence dose measuring device consists of a thermoluminescent light element carried by a worker and a measuring device.The thermoluminescent light element is set in the measuring device, the thermoluminescent light element is heated, and this The radiation exposure dose is measured by measuring the thermal phosphorescence emitted from the
Measured values are recorded as necessary.

An embodiment of the present invention will be described below.

Figures 1 to 3 show the thermal crab optical element S. Figures 1 to 3 show the thermal crab optical element S.
In FIG. 3, reference numeral 1 denotes a rectangular cylindrical case. A protruding plate portion 2 is integrally formed on one side of the case 1, and a large number of holes 3 are formed in this protruding slope portion 2. An identification number is coded by blocking any part of the code. Reference numerals 4 and 4' denote engagement grooves formed at the end of the side wall inside the hole of the rectangular cylindrical case 1, and reference numerals 5 and 5' denote engagement grooves formed at the other end of the side wall inside the hole of the case 1. They are a hole and an engagement groove.

Reference numeral 6 denotes a card inserted into the case, and one end of the card 6 has grooves 7, 7' formed therein, and claws 8, 8' bent inward.

Protrusions 9, 9' that engage with the engagement grooves 5' of the engagement holes 5 are formed at the tips of the claws 8, 8'. Reference numeral 10 denotes a thermal radiation material supported by the card 6, and thermal radiation materials 10 of the same or different types are arranged vertically so that exposure doses of various radiations can be measured.

When a plate or the like is inserted from the bottom end of the case 1 and the card 6 is pushed upward from the state shown in FIG.
, 9' can be slid upward until they engage with the engagement grooves 4, 4'.

The hot pot optical elements shown in FIGS. 1 to 3 are normally carried by workers at nuclear power plants and the like.

Next, a device for measuring the exposure dose of the thermal crab optical element will be explained.

First, a device for arranging a large number of thermal crab optical elements and feeding them to a measurement location will be described with reference to FIGS. 4 to 6.

In FIGS. 4 to 6, reference numeral 11 denotes a container 12 into which a large number of the hot crab optical elements are placed, and a feeding device that aligns the hot crab optical elements and supplies them to a rotary table 14 via a chute 13. A central shaft 15 of the rotary table 14 is rotatably supported by a substrate 17 by a bearing 16. On the outer circumference of the rotary table 14, four element storage holes 18 are provided at equal intervals into which the above-mentioned self-heating optical elements are inserted. It should be noted that the thermostatic light element inserted into the element storage hole 18 from above is prevented from coming off downward by a ring-shaped inner plate 19 fixed on the substrate 17. The hot optical elements S inserted into the element storage holes 18 of the rotary table 14 from the chute 13 are sequentially supplied by the intermittent rotation of the rotary table 14 by 1/4 rotation in the counterclockwise direction, and the exposure dose is measured by the measuring device section 20. After the measurement, the thermostatic light element is discharged from the discharge chute 2.
1 and is stored in a collection container 22. As shown in FIG. 5, the measuring device section 20 includes a thermal crab optical element sliding part 25 formed by combining substrates 23 and 24, and a thermal crab optical element that is heated by applying light to the thermal crab optical element. It is composed of a light emitting source 26 for detecting the thermal radiation, and a photomultiplier tube 27 for detecting the thermal radiation emitted from the thermal radiation element.

The thermal crab optical element supplied to the measuring device section 201 by the rotary table 14 is first moved upward in its entirety, optically reads the opening and closing of the numerous holes 3 of the protruding slope part 2 of the thermal crab optical element,
Next, move only the card 6 inside the thermal optical element further upwards,
Each thermal crab optical material 10 is sequentially sent to a measurement position and each thermal crab optical material 10 is measured.

When the measurement of all the thermal optical materials 10 is completed, the card 6 is moved downward and stored in the thermal crab optical element, and the entire thermal optical element is lowered and stored in the hole 18 of the rotary table 14. It is something that Next, the mechanism and operation of the measuring device section 20 will be explained with reference to FIGS. 7 to 12.

In FIGS. 7 to 12, reference numeral 23 represents the substrate, and two parallel grooves 28 and 29 are formed in this substrate 23.

30 is a main slider that moves up and down within the groove 28;
The upper and lower parts of this main slider 30 are provided with rollers 31 and 3.
2 and 33 are rotatably supported, and these rollers 31 and 32
, 33, the main slider 30 moves up and down smoothly within the groove 28.

34 is a rack formed on the main slider 30, 35 is a pulse motor fixed to the substrate 23, 36 is a pinion fixed to the rotating shaft of the pulse motor 35, and this pinion 36 and the rack 34 of the main slider 30 are connected. They are in mesh with each other, and when the pulse motor 35 rotates, the main slider 30 moves upward or downward.

37 is a holding plate in which long holes 38 and 39 are formed and a protruding holding piece 40 is formed;
is vertically slidably supported by the main slider 30 by pins 41 and 42 provided on the main slider 3.

43 has one end attached to the holding plate 37 and the other end attached to the main slider 3.
This spring 43 is engaged with the spring 43.
The retaining plate 37 is urged downward by the elastic force.

Reference numeral 44 denotes an L-shaped push-up plate to which the three main sliders are fixed, and a case push-up rod 46 is supported on this push-up plate 44 so as to be vertically slidable.

Note that this case push-up rod 45 is inserted into the groove 29 of the board 23.
It is something that slides inside. 46 is a long hole formed in the case push-up rod 45, and the protrusion 47 of the push-up plate 44 is inserted into this hole 46, and the case push-up rod 45
can move up and down with respect to the push-up plate 44 within the length range of the elongated hole 46. 48 has one end connected to the push-up plate 4
4 and the other end of which is engaged with a case push-up rod 45. Due to the elastic force of this spring 48, the case push-up rod 45 is urged upward with respect to the push-up plate 44.

Reference numeral 49 denotes a shark plate fixed to the main slider 30, and this shark plate 49 is provided with a shark plate filter 50 and a shark plate light emitting substance 51.

When the calibration filter 50 comes in front of the photoprint 27, the light emitting source 26 is adjusted so that the output of the photoprint 27 becomes a specified value, and the light emitting source 26 is calibrated. When it is placed in front of the photo mark 27, the photo mark 27 is aligned. Reference numeral 52 denotes a lever rotatably supported by a pin 53 on the board 23;
Reference numeral 4 indicates a spring that urges the bar 52 counterclockwise, and 55 indicates a solenoid fixed to the board 23.
They are connected by 7.

Assuming that the solenoid 55 operates, the bar 52 rotates,
The holding plate 37 is moved upward by the tip of the lever 52. Reference numeral 58 denotes a microswitch fixed to the substrate 23, which closes when the solenoid 55 is activated and the lever 52 is extended, and detects the operation of the solenoid 55.

A lever 59 is rotatably supported by a pin 60' on the substrate 23, one end of the lever 59 is connected to a movable piece 62 of a solenoid 61 with a pin 63, and the other end of the lever 59 has a collar 64. A needle 65 is supported. 66
67 is a microswitch that closes when the lever 59 rotates.

Next, the operation will be explained. When solenoid 55 operates,
As the holding plate 37 is moved upward as shown by the dotted line in FIG. 9, the microswitch 58 is activated, and the rotary table 14 is rotated. sent to. When the rotation of the rotary table 14 stops, the solenoid 55 becomes inactive, the holding plate 37 descends, and the holding piece 40 of the holding plate 37 supports the upper side of the card 6 in the thermal crab optical element. Next, the pulse motor 35
rotates, the main slider 30 and the case push-up rod 45 both move upward, and the entire thermal crab optical element is extracted from the rotary table 14. The thermal crab optical element is located in the wide part 2 of the groove 29.
9', the upward movement of the thermal crab optical element stops, and the identification number of the thermal crab optical element is detected by the reader (see Fig. 13), which will be described later.
Everything will be taken away. Next, when the solenoid 61 works and the lever 59 rotates, the tip of the needle 65 enters the engagement hole 5 of the case 1 of the thermoluminescent element, and the protrusion 9 of the card 6 and the engagement hole 5 of the case 1 enter.
The connection will be removed.

When the lever 59 rotates, the microswitch 67 operates, the pulse motor 35 rotates, and the main slider 30 moves upward together with the push-up plate 44 while the case push-up rod 45 remains stationary.

For this reason, only the card 6 in the case 1 of the thermal crab optical element is pulled out upward, and the topmost one of the plurality of thermal crab optical materials 10 provided on the card 6 is moved upward until it reaches the measurement point. be done. Here, the radiation exposure amount of the uppermost thermal crab material 10 is measured by a device (FIG. 14) to be described later.
When this measurement is completed, the pulse motor 35 rotates, and the thermal crab light materials are sequentially measured. When the measurement of all the hot crab light materials 10 is completed, the pulse motor 35 is reversely rotated, and the card 6 is transferred to the thermal crab light element. The thermal crab optical element is housed in a case S, and then the entire thermal crab optical element is lowered and housed in the hole 18 of the rotary table 14. After the measurement is completed as described above, turn the rotary table 1.
The thermal lighting elements S returned to No. 4 are collected into the collection container 22 via the discharge chute 21 after the rotary table 14 has mainly rotated in the counterclockwise direction.

FIG. 13 shows a reading device for reading the identification number of the thermal crab optical element S.

In FIG. 13, 68 is a lamp holding case attached to the board 24, and a lamp 69 is provided inside this holding case 68.
is stored. 7. This is ground glass attached to the front of the holding case 68, and the light from the lamp 69 is diffused by this ground glass 70.

Reference numeral 71 denotes an optical fiber supported by the substrate 23 via a holding member 72. One end of this optical fiber 71 faces the hole 3 of the protruding slope 2 on the side of the thermal fluorescence element. The end faces the light receiving surface of the photo sensor 73.

The identification number is read by detecting whether or not the light from the lamp 69 hits the light receiving surface of the photo sensor 73 via the hole 3 and the optical fiber 71. FIG. 14 shows a measuring device that heats the thermoplastic material 10 and measures the radiation exposure dose.

In FIG. 14, 74 is a funnel-shaped heat ray collecting tube fixed to the substrate 24, and a reflecting mirror 75 and a filter 76 are fixed to the opening □ of this heat ray collecting tube 74. 77 is a heat source lamp attached to the reflector 75, and the light emitted from this lamp 77 passes only the heat rays through the filter 76, and the heat rays are condensed and hit the thermal light material 1, where it is heated. Emit thermoluminescence.

Reference numeral 78 denotes a housing fixed to the substrate 23, and a glass shank 79 is inserted into the interior of the housing 78, and a filter 80 is housed therein.

Reference numeral 81 denotes a photoprint housed in the housing 78, and thermoluminescence emitted from the thermoluminescent material 10 is incident on the photoprint 81 via the glass holder 79 and the filter 80 to obtain an electrical output.

The present invention has the above configuration, and according to the present invention, the following effects can be obtained.

1. A large amount of thermoplastic material is supplied one by one using a rotating tape, and at the measurement point, the identification number and exposure dose can be read automatically and quickly.

2. Since the thermal crab optical element is supplied with a rotary table, the thermal crab optical element can be positioned with high precision.

[Brief explanation of drawings]

FIG. 1 is a front view of an example of a thermoluminescence dose reading device of the present invention, FIG. 2 is a bottom view of the same, and FIG.
The figure is a sectional view taken along the line A-A' in FIG. 2, FIG. 4 is a schematic top view of a thermoluminescence dose collecting device according to an embodiment of the present invention, FIG. 5 is a schematic side sectional view of the same, and FIG. 6 is a schematic top view of the same. A top view of the rotary table of the device, FIG. 7 is a view showing the opened state at BB' in FIG. 6, FIG. 8 is a perspective view of the mechanism for moving the thermal crab optical element of the device, and FIG. 9 is an enlarged view of the main part of FIG. 7, FIG. 10 is a sectional view taken along line C-C' in FIG. 9, and FIG. 11 shows a state in which the thermal crab optical element S is moved upward from the state shown in FIG. An enlarged cross-sectional view, FIG. 12 is a cross-sectional view of main parts showing the state in which the card 6 is extracted from the thermal phosphorescent element S, FIG. 13 is a cross-sectional view taken along line D in FIG. 11, and FIG. 'It is a sectional view. 1...Case, 2...Protruding plate part, 3...Hole, 4, 4'・
...Engagement groove, 5...Engagement hole, 5'...
・Engagement groove, 6... Card, 7, 7'... Division groove, 8, 8'
...Claw, 9,9'...Protrusion, 10...Thermal Crab Light Material, Evening 14...Rotating Table, 18...
...Element storage hole, 23, 24...Substrate, 26.
...Light source, 27...Photomultiplier, 28, 29...Groove, 30...Main slider, 34...Rack, 35... ...Pulse motor, 36...Pinion, 37...Holding plate, 43...
... Spring, 44 ... Push-up plate, 45 ...
...Case push-up rod, 46...Long hole, 47...
...Protrusion, 48...Spring, 49...
Shark front plate, 50... Filter, 51... Luminescent substance, 52... Lever, 55... Solenoid, 5
9...lever, 61...solenoid, 65...needle. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] 1. A cylindrical case with an identification number hole formed on the side,
a rotating table that rotates intermittently and has a hole for accommodating a thermal fluorescent element that slidably houses a card holding a thermal fluorescent material; a pushing means for pushing up only the card from the case of the optical element; a reading device for reading the identification number of the thermofluorescent element at the position pushed up from the rotary table; A thermoluminescence dose reading device comprising a measuring means for detecting thermal fluorescence generated from a material. 2. In the thermoluminescence dosimetry device according to claim 1, the push-up means includes a main slider that is slid by a motor, a push-up plate fixed to the main slider, and a push-up plate that is slidable within a certain range. A thermoluminescence dose reading device comprising a case push-up rod supported by a case push-up rod, and a spring provided between the case push-up rod and the push-up plate.