JPH0161192B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radiation measuring device for measuring the radioactive contamination state and radioactive distribution state of a working space where radioactive materials may exist, such as a working room of a nuclear power plant. In particular, the present invention relates to a portable radiation measuring device that can simultaneously measure the air dose rate and simultaneously record the air dose rate, the measurement position, and the measurement time in correspondence with the measurement position.

Conventionally, when detecting the state of radioactive contamination and distribution in a work space, a person measuring the air dose rate in the work space carried around a radiation measuring device such as a GM tube survey meter and measured the air dose rate at each of numerous measurement points. , record the measurement location, air dose rate, measurement time, and other conditions on the memorandum paper you brought with you. Based on this recorded data, create the distribution of air dose rate in the work room. That's what I was doing. However, according to this measurement method, the work of measuring and filling out a record sheet is repeated for each measurement point, so when measuring over a wide area,
It takes a lot of time and makes the measurement work complicated, resulting in extremely low work efficiency.Moreover, it increases the radiation exposure of the person being measured, which is extremely unfavorable from a safety standpoint.

The present invention has been made to address these points,
A radiation measurement device for measuring radioactivity distribution in a work space, comprising: a radiation detector and a radiation signal processing circuit for measuring the air dose rate at any measurement point; and a measurement time circuit for providing the measurement time. a liquid crystal graphic display panel comprising a group of liquid crystal elements arranged in a dimensional matrix and displaying a floor plan of the work space; a display signal supply circuit and a graphic signal for supplying pre-stored floor plan graphic signals to the liquid crystal graphic display panel; a control circuit that performs conversion control for the measurement, an address circuit that transfers signals between the liquid crystal graphic display panel, a measurement position instruction signal input circuit that has a measurement position instruction switch and generates a measurement position instruction signal, and A liquid crystal element scanning drive circuit that receives a position instruction signal and puts the liquid crystal elements in a two-dimensional matrix into an operating state in the order of arrangement, and a measurement position decoding circuit that decodes the measurement position from the address of the liquid crystal element activated by the measurement position instruction signal. a data processing circuit that processes each signal from the radiation signal processing circuit, the measurement time circuit, and the measurement position decoding circuit; a storage device that stores data from the data processing circuit; and a trigger that specifies measurement timing. The present invention aims to provide a radiation measuring device that is equipped with a switch circuit and can simultaneously convert and record data on the air dose rate, measurement position, and measurement time.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 1 shows the external appearance of the portable radiation measuring device of the present invention. 1 is the measuring device main body, and the front side of this measuring device main body 1 has a device for measuring the air dose rate at each measurement point in the work space. radiation detector 2
are integrally installed. This radiation detector 2 includes a GM tube type survey meter, a scintillation survey meter, an ionization chamber survey meter,
A proportional counter survey meter or the like is used. On the top surface of the measuring device main body 1, an indicator meter 3 that displays the measured value of the air dose rate and a display section 4 of a measurement time circuit that indicates the time of measurement are provided, and furthermore, liquid crystal elements arranged in a two-dimensional matrix are provided. A liquid crystal graphic display panel 5 arranged in groups and displaying a floor plan of the work space is installed. A measurement position indicating switch 6 for indicating the measurement position on the display panel 5 is provided on the side surface of the measuring device main body 1. In addition, 7 is a recording device that stores each data of the measured value of the air dose rate, the measurement position, and the measurement time for each measurement operation, 8 is a handle for carrying the measuring device main body 1, and 9 is a command for measurement timing. This is a trigger switch.

FIG. 2 is a block diagram showing the circuit configuration of the apparatus shown in FIG. 1, and numeral 10 is a display for storing in advance a graphic signal of a workspace floor plan to be measured and inputting the signal to the liquid crystal graphic display panel 5. Signal supply circuit 11 is display signal supply circuit 10
12 is an address circuit that transfers signals from the control circuit 11 to the display panel 5. The measurement position indication signal input circuit 13 has a measurement position indication switch 6 and provides a measurement position indication signal to the liquid crystal element scanning drive circuit 14. This liquid crystal element scanning drive circuit 14 is connected to the liquid crystal graphic display panel 5.
gives scanning operation commands to the liquid crystal element.
The measurement position decoding circuit 15 detects that the measurement trigger switch 9
It operates when turned ON, decodes the address signal from the liquid crystal graphic display panel 5, and sends measurement position data to the data processing circuit 16. Further, the radiation signal obtained by the radiation detector 2 is input to the data processing circuit 16 after being converted into an air dose rate by the radiation signal processing circuit 17, and measurement time data from the measurement time circuit 18 is also input. .

Next, the operation of the radiation measuring device configured as above will be explained.

First, a graphic signal of a work space floor plan to be measured is stored in the display signal supply circuit 10, and the floor plan is displayed on the liquid crystal graphic display panel 5 based on this graphic signal. For example, before starting measurement, an IC memory in which graphic signals are stored may be set in the display signal supply circuit 10, or a graphic signal may be stored in the display signal supply circuit 10 from a large-scale computer via an interface. A graphic signal for a floor plan of the work space passes through a control circuit 11 and an address circuit 12 to operate a predetermined liquid crystal element in a liquid crystal graphic display panel 5, so that a floor plan is displayed on the liquid crystal graphic display panel 5.

Next, the measurer turns on the measurement position instruction switch 6 while looking at the floor plan displayed on the liquid crystal graphic display panel 5 at the measurement location.
Scanning operation signals are measured from the position instruction signal input circuit 13 to the liquid crystal display scanning drive circuit 14
The liquid crystal elements in a two-dimensional matrix are put into an operating state in the order of arrangement as shown in FIG. If you turn off switch 6 when scanning to the measurement position,
The address of the liquid crystal element operating at that time will give the measurement position coordinates. Next, when the measurement trigger switch 9 is turned on, the measurement position decoding circuit 15 is activated to decode the address signal from the operating liquid crystal element, obtain the measurement position coordinates, convert them into data, and then the data processing circuit 16 send to Note that the designated liquid crystal element is kept in an operating state in order to confirm the duplication of measurements and the measurement position at which the measurement has been completed.

In addition, by turning on the measurement trigger switch 9, the radiation signal obtained by the radiation detector 2 is converted into an air dose rate by the radiation signal processing circuit 17 and sent to the data processing circuit 16, and the measurement time circuit Measurement time data is also input from 8 to the data processing circuit 16. Each data input to the data processing circuit 16 is converted into a digital signal or the like, organized into a predetermined format, and stored in the recording device 7. For example, it is converted into a data signal with a bit structure suitable for arithmetic processing by a general arithmetic device such as a microcomputer, organized in a predetermined order, and written into the storage device 7 through an interface attached to the data processing circuit 16. As the recording device 7, it is preferable to use one that is easy to take out and replace, such as a cassette magnetic tape (CMT).
In addition, IC memories, paper tapes, magnetic cards, magnetic disks, etc. can also be used.

After completing a series of measurement operations, each data measured and stored in this manner is read out by a computer or the like, subjected to corresponding processing such as a graphic signal, and used as distribution information of the air dose rate.

As is clear from the above description, according to the radiation measuring device of the present invention, a floor plan of the work space to be measured is displayed on a liquid crystal graphic display panel consisting of a group of liquid crystal elements arranged in a two-dimensional matrix; By instructing and operating the liquid crystal element corresponding to the measurement position while looking at the floor plan, and by decoding the address position of the liquid crystal element, measurement position data can be easily and quickly obtained, and air dose rate measurement data and Since it can be stored in the measuring device main body together with the measurement time data, it has the following effects.

(1) There is no need to read the data one by one from the meter as in the past, judge the measurement position from the floor plan in hand, and manually enter it on the recording paper, simplifying the work and significantly shortening the measurement time. Can be done.

(2) Errors in reading and writing measurement data are eliminated, and the determination of measurement positions is standardized and performed simply, quickly, and accurately, improving the reliability of the data.

(3) Since the measurement time is also recorded at the same time, it is possible to correct the measurement data and judge the reliability according to changes in the conditions of the work space, making it possible to accurately evaluate the air dose rate distribution.

(4) Data processing is facilitated because it can be organized and recorded in a signal format suitable for arithmetic processing by a computer or the like.

(5) By shortening the time required for measurement work, the amount of radiation exposure of the person being measured can be reduced, increasing safety.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a radiation measuring device showing an embodiment of the present invention, FIG. 2 is a block diagram showing the circuit configuration of the measuring device of FIG. 1, and FIG. 3 is a liquid crystal graphic display of the measuring device of the present invention. It is a schematic diagram of a panel. 1... Measuring device main body, 2... Radiation detector, 5
...Liquid crystal graphic display panel, 6...Measurement position instruction switch, 7...Recording device, 9...Trigger switch, 10...Display signal supply circuit, 14...
Liquid crystal element scanning drive circuit, 15... Measurement position decoding circuit, 16... Data processing circuit, 17...
Radiation signal processing circuit, 18...Measurement time circuit.

Claims (1)

[Claims] 1. A radiation measurement device for measuring radioactivity distribution in a work space, which includes a radiation detector and a radiation signal processing circuit for measuring the air dose rate at any measurement point, and a radiation signal processing circuit for measuring the measurement time. a liquid crystal graphic display panel comprising a group of liquid crystal elements arranged in a two-dimensional matrix and displaying a floor plan of the work space; and supplying a pre-stored floor plan graphic signal to the liquid crystal graphic display panel. A measurement position instruction circuit that includes a display signal supply circuit and a control circuit that performs conversion control of graphic signals, an address circuit that transfers signals to and from the liquid crystal graphic display panel, and a measurement position instruction switch that issues a measurement position instruction signal. a signal input circuit; a liquid crystal element scanning drive circuit that receives the measurement position instruction signal and puts the liquid crystal elements in a two-dimensional matrix into an operating state in the order in which they are arranged; a measurement position decoding circuit that decodes the measurement position decoding circuit; a data processing circuit that processes each signal from the radiation signal processing circuit, the measurement time circuit, and the measurement position decoding circuit; and a storage device that stores data from the data processing circuit. , and a trigger switch circuit for specifying measurement timing. 2. The radiation measuring device according to claim 1, wherein the radiation signal processing circuit and the measurement time circuit are each connected to a display section that digitally displays the air dose rate and the measurement time.