JPS60149999A - Controller for exposure dose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an exposure dose management device for radiation workers working in a radiation controlled area.

[Technical background of the invention and its problems] To protect the health of radiation workers, permissible exposure doses are determined, but strict personal management is required to keep the exposure doses below the permissible values. .

Therefore, in the past, each person was issued a personal identification card, and when working in a radiation controlled area, they were given a dosimeter, and when they left the area, the cumulative dose for a certain period of time was calculated and memorized. Exposure doses for each area were managed by comparing them with allowable values.

However, with the above conventional method, individuals are not notified unless the cumulative H1 dose exceeds the allowable value, and entry is permitted even if the cumulative H1 dose is close to the allowable value, so it is often the case that the dose is exceeded during work. It was difficult to carry out work without exceeding the permissible dose.

[Purpose of the Invention] An object of the present invention is to provide an exposure dose management device that can prevent an excess of the permissible dose during work and more reliably suppress the individual exposure dose to a permissible value or less.

[Summary of the Invention] Therefore, the present invention predicts and calculates the exposure dose for scheduled work, adds this predicted value to daily personal dose information to calculate the exposure dose for each period, and calculates the exposure dose in advance by calculating the exposure dose for each period. The feature is that it compares it with a set tolerance value and notifies you whether the scheduled work is acceptable or not.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to one drawing.

FIG. 1 shows a block configuration diagram of an exposure dose management device according to an embodiment of the present invention, in which 1 is a calculation unit, and 2 is the cumulative dose for each period for each individual.

Individual dose information storage unit that stores daily cumulative dose, 2-week cumulative dose, February cumulative dose, 3-month cumulative dose, and 2-year cumulative dose; 3
is a dose management unit that stores allowable dose values for each of the above-mentioned periods specified by laws and regulations. Reference numeral 4 denotes a pre-exposure dose section, in which predicted exposure dose values for each work content in the work place 2 are stored in advance when working within the radiation controlled area. 5 is an alarm device that sounds by changing various frequencies, 6
is an entry/exit prevention information section for outputting entry/exit prevention information;
7 is a personal identification card with a personal identification number attached, 8
1 is a card reading device, 9 is a dosimeter, and 10 is a dose value reading device.

Next, the operation of the exposure control device configured as described above will be explained, but before going into detailed explanation, an outline will first be explained.

When the worker enters the controlled area, the worker causes the card reader 8 to read the personal identification card 1-7 to which is attached the identification number 1a given to each individual in order to identify the individual. Based on the read identification number, the computing device 1 collects the cumulative dose for each period from the individual dose information storage unit 2 that stores individual exposure doses over a long period of time, and calculates the cumulative dose for each period as shown in Fig. 2. The cumulative dose value for each period is compared with the allowable dose value stipulated by laws and regulations, which is stored in advance in the dose management unit 3, and an entry eligibility check is performed by the arithmetic unit 1 to determine whether it exceeds the allowable dose value. the result,
Prevention information is output to the entry/exit prevention information unit 6 for workers who are overstepping the limit, and the alarm 5-1 is sounded at a different frequency to prevent entry.

Further, as shown in FIG. 3, the predicted exposure dose value is calculated by the calculation device 1 by adding the exposure dose value for each work content of the work place 2 stored in advance in the predicted exposure dose unit 4 and the cumulative dose value. , it is determined whether or not the expected exposure dose value exceeds the allowable value for each period based on the previously extracted allowable &@amount value. As a result, when there is a risk of exceeding the limit, warning information is output to the entry/exit prevention information unit 6, and in order to warn of entry prevention,
Change the frequency and make the alarm 5-2 sound.

As a result, workers can decide whether to enter the area based on the entry prevention warning information and the alarm sound, and either request someone else to do the work or carry out the work, making it possible to prevent exceeding the allowable dose value.

When leaving the area, the personal identification card 7 and the dosimeter 9 that was brought in when entering the area are read by the cart reader 8 and the dose value reader 10. Based on the read identification number, the calculation device 1 stores the exposure dose value in the individual dose information storage unit 2 that stores individual exposure doses over a long period of time, and extracts the dose value for each period from there. As shown in FIG. 4, the cumulative dose over a certain period in the past from the present time is calculated. Next, the number of rays for a certain period of time is compared with the gamma ray value specified by laws and regulations, etc., and an evacuation eligibility test is performed using the computing device 1 to determine whether or not the number of rays exceeded. In response, prevention information is output to the entry/exit prevention information unit 6, and the alarm 5-3 is sounded at a different frequency to prevent the user from leaving the area, and appropriate processing is performed by the guard.

In addition, by adding the predicted exposure dose value, cumulative dose value, and dose value for each work content of each work place stored in the predicted exposure dose unit 4 in advance, the predicted exposure dose value is calculated by the calculation device as shown in FIG. 1, and the previously extracted allowable dose value and the expected exposure dose value for each period are the allowable values? The arithmetic unit 1 determines whether or not the threshold is exceeded, and if there is a risk of the threshold being exceeded, warning information is output to the entry/exit prevention information unit 6, and the alarm 5-4 is sounded by changing the frequency to correspond to each alarm type. and notify workers that the predicted exposure doses for each period may be exceeded.

As a result, it is possible to know in advance whether or not the employee will be able to engage in the next task, making it easier to plan by task.

Next, FIGS. 2 to 5, which are the processing contents of the arithmetic unit 1 outlined below, will be described in detail below.

FIG. 2 shows the inspection flowchart 1- at the time of entering the area. When the computing device receives the personal identification number from the personal identification card 7 via the card reading device 8, it performs the processing at the time of leaving the area, which will be described later. First, the daily cumulative dose is retrieved from the individual dose information storage unit 2 in which the cumulative dose for the past year is stored in units of [ ]. Next, the line! The daily allowable dose is taken out from the management unit 3 and compared in size (101). As a result, if the cumulative dose is larger, the alarm 5-1 is selected and sounded (1,06), and the process here ends (107).

However, as a result of the judgment in process 101, if the cumulative dose is equal to or smaller than the allowable dose, first, the dose for the past week is retrieved from the individual dose information storage unit 2, and this is added to calculate the cumulative dose for the week. calculate. Next, the weekly allowable dose is extracted from the dose y laboratory 3 and compared in magnitude (102). As a result, if the cumulative dose is higher, the dog alarm 5-1 is selectively sounded (], 06), and the processing here ends.

Hereafter, in the same manner, process 1.03 to 105 for 1 month, 3 months for 1
By sequentially comparing the cumulative dose and allowable dose in the year,
Check whether or not you can enter the area.

Next, FIG. 3 shows a flowchart of a predicted exposure test upon entering the area, in which the calculation device 1 extracts the exposure dose from the predicted exposure dose section 4 and predicts the amount of exposure that will be received by performing the work from now on. 1III Calculate the radiation dose. In other words, the intensity of radiation received according to the work content of work place 2 can be determined by measuring it in advance, and since the value does not change much, the exposure dose per unit time is calculated from that value and the intensity of radiation received according to the work content of work place 1 is determined. Accordingly, the predicted exposure FA amount group part 4 is stored. When the radiation worker inserts the personal recognition cart 7 into the cart reader 8, operates keys not shown, and inputs the work location, work content, and work time, the corresponding information is displayed! The predicted exposure dose is calculated by taking the exposure dose per social position time from the predicted exposure dose unit 4 and multiplying it by the working time (200).

Next, the arithmetic device 1 retrieves the daily cumulative dose from the individual dose information storage unit 2 and adds the calculated predicted exposure dose thereto to calculate the predicted daily exposure dose (201). That is, if you work in a controlled area in the morning today and try to re-enter the area for two hours in the afternoon, the calculation device 1 first adds 2 to the exposure dose per unit time taken out from the predicted exposure dose section 4. Calculate the predicted exposure dose for the work to be done over time. Next, the arithmetic device 1 adds the predicted exposure dose to the cumulative m views of today's l+ previous period retrieved from the individual dose information storage unit 2 to calculate the predicted exposure dose of IIE.

When the calculation process 20] is completed, the calculation device 1 calculates the expected exposure dose for one week (202). That is, process 201
11 expected exposure dose calculated in , and the daily cumulative dose for the past 6 days up to yesterday from the individual dose information storage unit 2,
By adding the amounts, the expected exposure amount a for the past week including today is calculated.

Thereafter, in the same manner, in steps 203 to 205, the expected exposure doses for a month, three months, and two years are calculated, respectively. After that, process 2
From 06 to 210, the expected exposure dose for each period is compared with each allowable value, and if the expected exposure dose is a dog,
In process 211, the f-alarm device 5-2 is activated.

FIG. 4 shows the inspection flowchart 1- when leaving the area, in which the computing device 1 is a cart reader @8. Line kite value reading device 10
When the personal identification number is read from the personal identification card 7 and the dosimeter 9 through the exposure dose value (300), the eye dose is calculated by adding it to the daily cumulative dose retrieved from the individual dose information storage unit 2 (301). , and is stored in the individual dose information storage unit 2 again as today's dose. At this time, the individual line information storage unit 2 has a capacity to store the oral dose for exactly 365B per year, and when the day is updated, in exchange for providing a storage location for the cumulative dose for that day - - Delete the cumulative dose storage location for the oldest date and update the memory.

Next, the arithmetic unit 1 processes; at ports 02-305, the weekly dose, monthly dose, and 3-monthly dose! Calculate i8 amount and annual line dragon. Furthermore.

In processes 306 to 310, the respective allowable values are compared, and if the exposure dose for each period exceeds the allowable value, the V alarm 5-3 is selected and activated lf+.

FIG. 5 shows the flowchart 1 of the expected exposure test when leaving the area. When leaving the area, the radiation worker carries the personal identification card 7 and the dose section 9 to the cart reader @ 8. Line claw value reading device 1
0 and at the same time operate a key (not shown) to enter the date and location of the scheduled work the next time you enter the area.

Enter the content, 2 hours, etc. The arithmetic unit 1 receives these schedule data, calculates the preliminary exposure dose value in the same manner as described above, and performs processes 401 to 405 for El, weekly, monthly, and 3 months.

Calculate the expected exposure dose for the year. Subsequently, processing 406~
410 and compares it with each allowable value, and if the expected exposure dose exceeds the allowable value, the alarm 5-4 is selected and sounded. This makes it possible to confirm the number of workers who will be available for the next task, and to carry out the task in accordance with the 31 strokes, with one worker in front and with a clear line of sight.

Note that the alarm device 5 may change not only the frequency but also the intermittent period. Furthermore, a verbal warning may be given using a voice synthesizer.

[Effects of the Invention] As described above, according to the present invention, the expected exposure dose for each period is calculated and compared with each allowable value to decide whether or not to work in a controlled area. The radiation dose to radiation workers can always be kept below the allowable value, and the number of workers can be known in advance, making it easier to plan work.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an exposure dose control device according to an embodiment of the present invention, FIGS. 2 to 5 are flowcharts 1 to 5 for explaining the operation of FIG. 1, and FIG. Figure 3 is the flowchart for the expected exposure test when entering the area, Figure 4 is the flowchart for the inspection when leaving the area, and Figure 5 is the flowchart for the inspection when leaving the area.
The figure is a flowchart 1 for a predicted exposure test at a time of retirement. 1. Arithmetic device, 2... Individual dose information storage section, 3.
・Dose field science department, 4... Predicted exposure dose department, 5... Alarm device, 6 Entry/exit prevention information department, 7. Personal recognition card, 8
...Card reader, 9.Dose analysis, 10.Dose control device. Figure 1 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] In the exposure dose control device installed at the entrance to the radiation control area to manage the exposure dose of radiation workers,
Means for updating and storing daily personal exposure dose information over a certain period of time, means for storing allowable exposure doses for each period, and means for storing data for calculating predicted exposure doses. a means for calculating a predicted exposure dose for the scheduled work based on the data; and a means for calculating the predicted exposure dose for each period by adding the calculated predicted exposure dose and the daily personal exposure dose information. , means for comparing the calculated expected exposure dose with the exposure dose tolerance value and notifying whether or not the scheduled work is acceptable.