JPS5812146Y2 - Heating device for thermoluminescent dosimeter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device for a thermoluminescence dosimeter that sub-determines the radiation exposure dose.

When a thermoluminescent element (hereinafter referred to as an element) exposed to radiation is heated, thermoluminescence is emitted from the element.

This thermoluminescence is converted into electric current using a photomultiplier tube,
By integrating this current and detecting this integrated value,
Radiation exposure dose can be known≧ The present invention relates to a heating device in the thermoluminescence dosimeter, and first the structure of the element will be explained with reference to FIG.

In FIG. 1, 1 is a card, and this card 1 is formed with a hole 2 having a stepped portion.

Reference numeral 3 denotes a sheet disposed at the stepped portion of the hole 2, and a thermoluminescent material 4 is fixed to the lower surface of the sheet 3.

5 is a cover having a spherical protrusion, and the thermoluminescent material 4 is covered with the cover 5.

6 is a ring plate. A plurality of holes 2 are formed in the card 1, and a thermoluminescent material 4 is similarly housed in the matching holes 2.

'FIG. 2 shows a heating device for a conventional thermoluminescent dosimeter.

Referring to Figure 2, γ and 8 are housings, and this housing? , 8 is formed with a groove 9 into which the card γ shown in FIG. 1 is transferred.

10 is a heat collecting pipe in which a conical through hole 11 is formed, and a screw groove 12 is formed in the upper inner surface of this heat collecting pipe 10.

13 is an infrared transmission filter that covers the upper surface of the through hole 11 of the heat collecting pipe 10, 14 is a hemispherical reflecting mirror, 15 is a heating lamp attached to this reflecting mirror 14, and 16 is a ring-down restraining device. The ring lowering restrainer 16 is screwed into the thread groove 12 of the heat collecting pipe 10, and the ring lowering restrainer 16 fixes the reflecting mirror 14 and the infrared transmission filter 13 together.

Numeral 17 is a screw for attaching the heat collecting pipe 10 to the housing 7.

18 is a light glass inserted into a hole in the housing 8.

In FIG. 2, only the infrared rays of the light emitted from the heating lamp 15 pass through the infrared transmission filter 13, and this infrared ray is converged by the heat collecting pipe 10 to emit thermoluminescent material 4 of the element.
is irradiated.

For this purpose, the thermoluminescent material 4 is heated and thermoluminescence is generated.This thermoluminescence is incident on a photomultiplier tube (not shown) through a light glass 18.

In the heating device described above, the element is heated by irradiating infrared rays. In this case, the sheet 3 of the element is also heated, the components of this sheet 3 are evaporated, and the inner button of the through hole 11 of the heat collection pipe 10 and the infrared transmission filter 13 are heated. or impurities may enter during heating and adhere to the heat collection pipe 10 and the infrared transmission filter 13, reducing the heat collection effect or changing the heating conditions.

Therefore, it is necessary to disassemble the heating device and clean the heat collecting pipe 10 and the infrared transmission filter 13.

However, in the conventional example, it is necessary to rotate and disassemble the ring lowering suppressor 16, and the heat collecting pipe 1
0. There was a drawback that removal of the infrared transmission filter 13 was complicated.

The present invention provides a heating device that does not allow impurities to enter the heat collecting pipe, and the following describes an embodiment of the present invention, with the same numbers assigned to the same parts as in Fig. 2 and shown in Fig. 3. explain.

In FIG. 3, 10' is a heat collecting pipe having a conical through hole 11'.
An infrared transmission filter 13' is attached to the lower end opening of the filter 1'.

Reference numeral 14 denotes a reflecting mirror holding a heating lamp 15, and this reflecting mirror 14 is arranged so as to cover the upper part of the through hole 11' of the heat collecting pipe 10'.

19 is a rubber ring disposed on the flange 14' of the reflecting mirror 14, and 20 is a ring plate. By screwing this ring plate 20 to the heat collecting pipe 10', the reflecting mirror 14 collects heat. It is airtightly attached to the upper part of the pipe 10'.

As described above, in the heating device of the present invention, the tapered side opening of the tapered through hole of the heat collecting pipe is closed by the infrared transmission filter, and the upper end opening of the through hole, that is, the tip opening. Because the reflector is airtightly installed, impurities do not enter the heat collecting pipe, and there is no need to clean the inside.

In addition, impurities attached to the outer surface of the infrared transmission filter,
It has the advantage that cleaning can be done easily and in a short time by removing the housing without removing the heat collecting pipe.

In order to increase the transmittance of infrared rays, it is necessary to polish both sides of the residual infrared transmitting filter and coat it with an anti-reflection film.For this reason, it is very difficult to create a large diameter filter, but this invention According to this method, the filter diameter can be reduced and the cost can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main parts of a thermoluminescent element, Fig. 2 is a sectional view of a heating device of a conventional thermoluminescent dosimeter, and Fig. 3 is a sectional view of a heating device of a thermoluminescent dosimeter according to an embodiment of the present invention. FIG. 1... Card, 2... Hole, 3...
... Sheet, 4 ... Thermoluminescent material, 5
...Cover, 6...Ring plate, 7.8
...Housing, 1σ ... Heat collection pipe, 11' ... Through hole, 13' ... Infrared transmission filter, 14 ... Reflection Mirror, 15...
... Heat lamp, 19 ... Rubber ring, 20
...Ring board.

Claims (1)

[Scope of utility model registration request] In a heating device for a thermoluminescent dosimeter that converges light from a heating lamp in a through hole of a heat collecting pipe and irradiates the thermoluminescent element, the through hole of the heat collecting pipe is arranged from a first opening to a second opening. It tapers toward the opening, the first opening is closed by a reflecting mirror to which the heating lamp is attached, the second opening is closed by an infrared transmission filter, and the area near the filter is closed. A heating device for a thermoluminescent dosimeter that heats a thermoluminescent element disposed outside the through hole of the dosimeter.