JPS5922915B2 - thermoluminescence dosimeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoluminescence dosimeter for reading the amount of radiation irradiated, and particularly to provide a thermoluminescence dosimeter that can accurately read the amount of radiation irradiated.

Recently, thermoluminescent dosimeters have been used to control radiation exposure of employees at nuclear power plants, etc., and many of these thermoluminescent dosimeters have the structure shown in Figures 1 and 2. It had been.

The conventional thermoluminescent dosimeter shown in FIG. A lid 6 is attached to the end of the card 5, which has an information hole 4 configured with a plurality of information holes 3 for recording information.
The card 5 is constructed by attaching a removable storage body 7 to the remaining portion of the card 5 having the element 1 and the information hole portion 4.

Furthermore, the conventional thermoluminescence dosimeter shown in Figure 2 is
This card 12 has a circular element 8 and an information hole section 10 configured by providing a plurality of information holes 9 for recording necessary information, and a protrusion 11 on one end side surface.
A storage body 14 having a through hole 13 in which is removably stored.
It is constructed by storing it in.

By the way, in the thermoluminescence dosimeter shown in FIGS. 1 and 2, the elements 1 and 8 and the information hole 4°10 are arranged on the same card 5 and 12, and therefore the information holes 3 and 9 are arranged on the same card 5 and 12.
The information recorded on the cards 5 and 12 is read in the storage body 7.
, 14, and as a result, the thermoluminescent phosphor, whose value changes depending on the amount of light it receives, will be exposed to external light, and the integrated dose of each element will change.

Moreover, since the cards 5 and 12 easily come off from the storage bodies 7 and 14, the cards 5 and 12 may inadvertently come off from the storage bodies 7 and 14 while an employee is installing them, causing the above-mentioned problem. This is likely to occur in the case of the thermoluminescent dosimeter shown in FIG.

Furthermore, in the case of the thermoluminescent dosimeter shown in FIG. 2, the card 12 is provided with a positioning protrusion 11 that protrudes from the card 12, which complicates the reading device and may lead to reading errors. Ta.

The present invention eliminates these conventional drawbacks, and embodiments of the thermoluminescence dosimeter of the present invention will be described below with reference to the drawings of FIGS. 3 to 10.

3 to 8 show a thermoluminescence dosimeter according to an embodiment of the present invention, and in the figures, 20 is a flat card having a plurality of elements 21 (four in the figure) arranged side by side in the longitudinal direction, One end of the card 20 is provided with a cut groove 22 cut in the longitudinal direction, and a hook portion 23 is provided at the tip of the piece separated by the cut groove 22. A locking piece 24 is provided.

25 is a storage body for storing this card 20, and this storage body 25 is composed of a lower frame body 26 and an upper frame body 2γ, and a vertical wall 28 provided on the lower frame body 26 and an upper frame body 27. A storage space 29 for storing the card 20 is formed,
An information hole section 31 is formed outside the storage space 29 on the lower frame body 26 and has a plurality of information holes 30 for recording necessary information such as numbers to distinguish employees. .

A standing wall 28 forming a storage space 29 with this storage body 25
One end is provided with a locking portion 32 and a locking groove 33 for locking the hook portion 23 of the locking piece 24 of the card 20, and the end surface on the side of the locking groove 33 is provided with a locking groove 33 that is wider than the width of the card 200. A narrow kerf 34 is provided.

In addition, shield bodies 35 and 36 are disposed on the lower frame body 26 of the storage body 25 to limit the amount of radiation received by the element 21, and an opaque shield body is provided near the end face on the side where the card 20 is inserted. A film 37 is provided.

Also, shield bodies 38 and 39 are disposed on the upper frame body 27 at positions facing the shield bodies 35 and 36, and opaque films 4 and 4 are disposed at positions facing the opaque film 37.
0 is placed.

The element 21 attached to the card 20 is constructed as shown in FIG. The thermoluminescent phosphor 21c is attached to the substrate 2.
The element 21 is constructed by disposing the thermoluminescent phosphor 21c firmly on the card 21a and covering the thermoluminescent phosphor 21c with a dome-shaped transparent cover 21d.
The element 21 is attached to the card 20 by making the element 21 come into contact with the protrusion 20b of the mounting hole 20a provided in the card 20, and fixing the element 21 by sandwiching its peripheral edge between the protrusion 20b and the annular fixing frame 20c.

Here, the card 2 is placed in the storage space 29 of the storage body 25.
0 is inserted and the hook portion 23 of the locking piece 24 of the card 20 is locked to the locking portion 32, the card 20 is stored in the storage space 29, and when the card 20 is taken out from the storage space 29, By inserting a pin or the like into the locking groove 33 and pushing the hook portion 23 of the locking piece 24 of the card 20, removing the hook portion 23 from the locking portion 32, and pushing the end surface of the card 20 through the cut groove 34, the card 20 is released. can be taken out from the storage space 29.

Moreover, when the card 20 is stored in the storage space 29, the element 21 of the card 20 is
and the opaque film 37°40.

As is clear from the above description, in the thermoluminescence dosimeter according to the present invention, the element 21 is arranged on the card 20,
The storage body 25 that stores the card 20 is provided with an information hole portion 31 having a plurality of information holes 30 for storing specific information, and the information content stored in the information holes 30 is stored in the card 20. It can be confirmed from the outside without taking it out from the storage body 25, and as a result, the integrated dose of the element 21 arranged in the card 20 is less likely to change due to external light.
Not only can the radiation dose be measured accurately, but also the reading of the information hole 30 and the reading of the radiation dose accumulated in the element 21 can be carried out simultaneously, and the time required for reading can be shortened.

Furthermore, when the card 20 is taken out from the storage body 25, the locking piece 24 has to be released from the locking portion 32, which may cause the card 20 to be inadvertently pulled out when the employee is holding it. It does not come out of the container 25, there is no problem that the integrated dose of the element 21 changes due to external light, and there is no fear of loss.

In addition, since the height of the card 20 protrudes from the card 20 and has a clean shape, the configuration of the reading device is not complicated, and errors in the position of the card 20 when reading the radiation dose are less likely to occur. Accuracy can be improved.

Furthermore, since the information hole portion 31 is provided outside the storage space 29 in which the card 20 is stored, there is no mechanical problem even if the portion where the information hole portion 31 is provided is made thin. 30 can be made shallow, light for reading information can be used effectively, and reading accuracy can be improved.

Further, the information hole portion 31 can also be used to regulate the direction of the storage body 25.

Further, if the information hole 30 is formed with a thin portion left, necessary information can be easily recorded by punching out the information.

9 and 10 show a thermoluminescence dosimeter according to another embodiment of the present invention, and the thermoluminescence dosimeter shown in FIGS. A notch 41 having an inclined surface is provided at the end of the standing wall 28 of 26 on the side where the card 20 is inserted, and the locking piece 24
are provided on both sides of the card 20.

Reference numeral 42 denotes a recessed portion provided to prevent the locking piece 24 of the card 20 from constantly bending and fridging and deteriorating its elasticity when the card 20 is stored in the storage space 29 of the storage body 25.

This recess 42 has an inclined surface 43, which allows the locking piece 24 to easily bend when the card 20 is pulled out, so that no problem occurs.

Therefore, in the embodiments shown in FIGS. 9 and 10, when the card 20 is taken out, the hook portion 23 is locked in the notch portion 41 and the card 20 can be prevented from coming off from the storage body 25, and the card 20 can be prevented from being lost. can be completely prevented.

As described above, the thermoluminescence dosimeter according to the present invention has
An information hole for storing necessary information is provided in a storage body having a storage space in which a card equipped with a thermoluminescence phosphor element is removably stored. The recorded contents can be read without removing the card from the storage body, which eliminates the problem of the integrated dose of the element changing due to external light, and allows accurate radiation exposure to be determined. It is now possible to simultaneously read the content recorded on the device and the radiation dose accumulated in the device, reducing the time required for reading.

As described above, the thermoluminescence dosimeter according to the present invention has excellent effects and greatly contributes to technological development in this field.

[Brief explanation of drawings]

1 and 2 are external perspective views showing a conventional thermoluminescence dosimeter, FIG. 3 is a partially cutaway perspective view of a thermoluminescence dosimeter according to an embodiment of the present invention, and FIGS. 4 and 5. Figure 6 is a front view of the dosimeter with the upper frame removed, and Figure 6 is a sectional view showing the main structure of the dosimeter.
7 and 8 are enlarged cross-sectional views showing the structure of the main parts of the dosimeter, and FIGS. 9 and 10 show the thermoluminescence dosimeter according to another embodiment of the present invention with the upper frame removed. FIG. 20... Card, 21... Element, 21c... Thermoluminescent phosphor, 23-... Hook portion, 24... Locking piece, 25... Storage body, 29... Storage space , 30...
- Information hole, 31... Information hole part, 32... Locking part.

Claims (1)

[Scope of Claims] 1. A card provided with an element having a thermoluminescent phosphor, and a storage space in which the card is detachably stored, and an information hole for recording necessary information, as described above. A thermoluminescence dosimeter characterized by a storage body provided outside a storage space. 2. According to claim 1, the card is housed and fixed in the storage space of the storage body by locking the hook portion of the locking piece provided on the card to the locking portion provided on a part of the storage body. thermoluminescent dosimeter. 3. The thermoluminescence dosimeter according to claim 1, wherein the thickness of the portion where the information hole is provided is thinner than other portions.