JPH0537266Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Field of Application of the Present Invention> The present invention relates to a portable radiation exposure measuring device equipped with identification means used in nuclear facilities.

<Conventional technology> (Fig. 3) Conventionally, in nuclear power plants and other facilities that handle various radioactive sources, it has been difficult to accurately grasp the radiation exposure dose of each individual worker working in the facility. In order to ensure that workers carry direct-reading radiation dosimeters and film badges, the dosimeters and film badges are managed by linking them to the specific individuals using them to prevent individual workers from being exposed to radiation exceeding the permissible limit. Was.

The simplest method of such management is to number each dosimeter, assign a specific number to each user, and ensure that the user always uses the dosimeter with that specific number. This type of management has been in place for quite a long time, with records being kept according to the numbers.

The disadvantage of this method is that the carrying of the dosimeter can only be fully controlled by the awareness of the worker using it, who may forget to carry it or refrain from carrying it for reasons of inconvenience. Since it is conceivable that the method may be abandoned, it must be said that it is inappropriate as a method for long-term exposure control.

In order to eliminate this situation, an automatic control method will be developed to ensure that people who do not carry a dosimeter are not allowed to enter an area where radiation exposure needs to be controlled. It was devised. Various methods have been used for this purpose, but as shown in Figure 3, the general method is to affix a barcode label B to the dosimeter (film badge in the illustrated example) 1, and then This barcode label B is used as a key, and a barcode reader (not shown) is installed at the entrance to the managed area, and the person carrying dosimeter 1 must scan the barcode label B when entering the area. Code label B is placed on a barcode reading device, the reading results are identified by a computer, and the accuracy of the code is confirmed, the wearer is identified, and the total amount of radiation exposure during a certain period of time is calculated, etc. Ensuring that the entrance/exit is unlocked only when all results are deemed appropriate;
Dosimeters are now required to be carried when entering and exiting controlled areas.

According to this method, workers who do not carry appropriate dosimeters are not allowed to enter or leave the controlled area, so it is possible to reliably manage the confirmation of workers' exposure doses, dramatically improving safety and certainty of management. Since contact between the barcode label 2 and the barcode reader is unavoidable, in the worst case, contamination due to contact may occur and be transmitted via the barcode reader.

<Purpose of the present invention> The purpose of the present invention is to eliminate the above-mentioned drawbacks, to provide a portable radiation dosimeter that can be reliably managed by a computer and is free from contact contamination.

<Embodiments of the present invention> (FIGS. 1 and 2) Hereinafter, embodiments of the present invention will be described based on the drawings.

What is shown in FIGS. 1 and 2 is a conventionally used film badge 1, in which a main body 3 and one side of a lid 4 are connected to each other by a hinge 5 so as to be openable and closable. Reference numeral 6 denotes a film accommodating portion recessed inside the main body 3, and 7 a film support provided protruding inside the lid 4 and recessed into the film accommodating portion 6 when the lid 4 is overlapped with the main body 3. Department. A transparent window 8 is formed in the film storage section 6 toward the outside, one half of which is closed by a synthetic resin plate 9, and a filter 1 made of various metals is formed.
0, 11, 12, and 13 are buried. The filter 1 of the film storage section 6 is also attached to the film support section 7.
Filters 10, 11, 12, and 13 of the same quality are buried corresponding to filters 0, 11, 12, and 13.

Reference numeral 14 designates a recess installed above the film accommodating portion 6 of the main body portion 3, and reference numeral 15 designates a fixing protrusion protruding from the center of the aforementioned recess 14, which is used when the main body portion 3 and the lid body 4 are overlapped. . When the two are superimposed, the fixing protrusion 15 is recessed into a fixing recess 16 provided above the film support portion 7 of the lid 4, and the two are superimposed and fixed to each other.

17 is a recess for separation formed in the side surface of the main body 3; 18 is a slit formed parallel to each other on the surfaces of the ends of the main body 3 and the lid 4 facing the hinge 5; Insert the clip 19 shown in the figure,
The clip 19 allows the film badge 1 to be attached to the user's body. Reference numeral 20 denotes a passive remote identification element inserted into the recess 14 of the main body 3, and 21 in FIG. be.

The passive remote identification element 20 is a silicon chip encapsulated in a polyurethane capsule that has been programmed in advance at the manufacturing stage in the factory, and the programmed code can be identified by applying a low frequency electromagnetic wave. It's getting old,
Since it has a data amount of 35 bits + 5 parity codes, it is theoretically possible to secure a series of 34 billion identification codes.

Such products are called passive integrated transponders (PASSIVE
It is sold under the name INTEGRATED TRANSPONDER by IDENTIFICATION DEVICES, INC. in the United States as an identification device for livestock, various mechanical products, etc.

<How to use and function of the above embodiment> A specific film badge shown in the embodiment is lent to a specific individual, and that individual always uses the film badge.

When in use, as shown in FIG.
1, close the lid 4, insert the clip 19 into the slit 18, and store it in a fixed storage location.

When the user of the film badge 1 enters the managed area, he or she must take his or her film badge 1 from the storage area and carry it with him to the managed area.
Passing in front of an excitation device that emits low-frequency electromagnetic waves installed at the entrance to the controlled area. The passive remote identification element 20, which is placed on the film badge 1 by means of an excitation device, emits its unique code;
Once the transmitted code is read, the subsequent processing is calculated by a computer, which determines the owner of the code, the total amount of radiation the owner has been exposed to up to that point, the amount of radiation the owner can tolerate over a certain period of time, etc. is immediately calculated, and if entry is permitted, the door to the managed area is unlocked; if entry is not allowed, the door remains locked and a warning signal is generated.

The computer operation during this time can be freely selected by determining the program according to the needs of each workplace.

Next, when leaving the managed area, the same procedure as when entering the area is followed, and the activity time, etc. in the managed area of the owner of the film badge 1 related to the code is quickly recorded.

After leaving the area, the user of the film badge 1 stores the film badge 1 in a predetermined storage location and stores it there until the next use.

In the meantime, in order to measure the exposure dose, the operator reads the code on the film badge 1, removes the contained exposure measurement film 21 from the film badge 1, and loads a new exposure measurement film 21 into the film badge 1. and return it to its original storage location.

The measurer performs phenomena and measurements while ensuring that the exposure measurement film 21 corresponds to the unique code of the film badge 1, and inputs the results into the computer. In this way, all the necessary data can be classified and classified according to the code provided by the passive remote identification element 20 attached to the film badge 1.
The past information regarding film badge 1 is calculated.
This will allow you to quickly and reliably utilize the current exposure situation, tolerable limits for future exposure, etc.

In the above explanation, an example was shown in which the passive remote identification element 20 was applied to a film badge, but the present invention can be applied to all portable radiation dose measurement devices and can be used in general. If applied to both direct-reading radiation dosimeters and film badges, which are used together, the control status will be almost perfect.

<Effects of the present invention> As explained above, according to the present invention, (a) it is possible to easily obtain a portable radiation exposure measurement device that can be used as a key when entering and exiting a controlled area; ) Entry/entry by persons who do not carry radiation exposure measuring devices
(c) It is possible to provide a portable radiation exposure measurement device that can easily control all aspects of radiation exposure, such as monitoring, confirmation, and management.

[Brief explanation of the drawing]

Fig. 1 is a perspective view for explaining the interior of an embodiment of a film badge to which the present invention is applied, Fig. 2 is a vertical sectional view of the central part in use, and Fig. 3 is an exploded slope view of a conventional film badge. It is a diagram. 1... Film badge, B... Barcode label, 3... Main body, 4... Lid, 5... Hinge, 6
...Film storage section, 7...Film support section, 8
... Transparent window, 9 ... Synthetic resin plate, 10, 11, 1
2, 13...metallic filter, 14...concavity,
15...Fixing protrusion, 16...Fixing recess, 17
... separation recess, 18 ... slit, 19 ... clip, 20 ... passive remote identification element, 21 ...
Film for radiation exposure measurement.

Claims (1)

[Scope of utility model registration request] A portable radiation exposure measuring device comprising an identification means having a passive remote identification element.