JPH0617092Y2 - Fluorescent glass dosimeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a fluorescent glass dosimeter for separately measuring radiation exposure dose of multi-ray quality, and particularly to a fluorescent dosimeter for insertion and removal. The present invention relates to a fluorescent glass dosimeter having an improved filter mounting structure for avoiding contact between a card holding a glass element for use with a filter.

(Prior Art) Generally, a fluorescent glass dosimeter uses a glass element for a fluorescent dosimeter made of phosphate glass containing silver ions. This glass element emits fluorescence when excited by ultraviolet rays having a wavelength of 300 to 400 nm after being activated by exposure to radiation, but the fluorescence intensity at this time is proportional to the radiation dose, so it is necessary to detect this fluorescence intensity. Can measure the radiation dose.

In this way, when measuring the radiation dose, the light projected from the ultraviolet excitation light source is passed through an optical filter to selectively extract the ultraviolet light of a predetermined wavelength, and then the light is incident almost vertically on one surface of the rectangular parallelepiped glass element. To do. Here, the glass element which receives the ultraviolet rays of a predetermined wavelength emits fluorescence, and the fluorescence emitted at this time is taken out from the direction perpendicular to the incident direction of the ultraviolet rays and the light in the predetermined wavelength range is passed through the optical filter. After that, photoelectric conversion is performed by a photomultiplier tube to obtain an electric signal having a level substantially proportional to the fluorescence intensity, and the fluorescence intensity, and thus the radiation dose, is measured from the level of this electric signal.

By the way, conventionally, two types of fluorescent glass dosimeters having the above-mentioned functions have been developed.

One of them is an upper side which is formed in a substantially reverse concave shape in cross section (see FIG. 5B) as shown in FIG. 5 and in which the slide receiving grooves 2 are provided inside both legs 1 of the reverse concave shape portion. Case 3
And a dish-shaped lower case 5 having slide ridges 4 that slide along the slide receiving groove 2 on both side surfaces form a box-shaped case. In this lower case 5, a card 7 holding a fluorescence dosimeter glass element 6 can be inserted and pulled out, and the energy dependence of the radiation irradiation dose on the inner surface portions of the upper case 3 and the lower case 5 at predetermined locations. A filter 8, which adjusts the sex, is implanted.

Therefore, in such a fluorescent glass dosimeter, after inserting the card 7 holding the glass element 6 into the lower case 5, the slide protrusion 4 is hooked on the slide receiving groove 2 to slide the lower case 5 into the slide receiving groove. When pushed in two directions, lower case 5
Moves along the slide receiving groove 2 and is fitted into the upper case 3.

The other one is a thermoluminescence dosimeter as shown in FIG. 6, which has a plurality of filters 13, ... Implanted on the outer upper and lower surfaces of a box-shaped case 12 having an opening 11 at one end. Further, the filter 1 is provided above these filters 13 ...
3, and a label 14 is attached to indicate the type of dosimeter and the measuring portion (JP-A-53-53).
77575).

(Problems to be solved by the invention) However, in the former fluorescent glass dosimeter, since the filters 8, ... Implanted on the inner surface of the lower case 5 serve as sliding surfaces, the card 7 at the time of insertion and removal Is often caught in the filter mounting groove of the lower case 5 or the filter itself, and may be peeled off when the filter 8 is not properly mounted.

Next, in the latter thermoluminescence dosimeter, it is difficult to arrange the filters 13, ... All over the outer circumference of the case 12, and when a certain filter 13 becomes defective, the filter groove must be filled with a spacer. Further, the filter 13 may be peeled off when the label 14 is replaced.

The present invention has been made in view of the above circumstances, and has a structure capable of avoiding contact between a card holding a glass element and a filter, eliminating peeling of the filter and other functional element damage, and improving the reliability of the measurement mechanism. An object is to provide a fluorescent glass dosimeter that can be improved.

[Means for Solving the Problems] (Means for Solving the Problems) In order to solve the above problems, the present invention provides a box-shaped outer case having an opening formed at one end, and an opening formed inside the outer case through the opening. A box-shaped inner case that is inserted and has an opening formed at an end portion in the same direction as the outer case; and a card that holds a fluorescence dosimeter glass element housed inside the inner case through the opening of the inner case. A filter embedded in the inner surface of the outer case or the outer surface of the inner case.

(Operation) Therefore, by taking the above-mentioned means, the present invention has the filter installed on the inner surface of the outer case or the outer surface of the inner case, and the card holding the glass element is housed in the inner case. Therefore, when the card is inserted or taken out, the card is not caught on the inner surface of the case, for example, the filter groove or the filter itself. Of course, since the filter is sandwiched between the outer case and the inner case, there is no fear of peeling the filter. Moreover, since the filter is not exposed to the outside, it can be attached to the entire inner surface of the outer case or the outer surface of the inner case.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. When the fluorescent glass dosimeter is disassembled, the outer case 2 is removed as shown in FIGS.
0, the inner case 30 and the card 40.

The outer case 20 has an opening 21 formed at one end, and is formed of resin as a whole into a rectangular parallelepiped box.

The inner case 30 is inserted into the outer case from the opening 21 of the outer case 20.
Similarly, a plurality of filters 32a, 32b, 3b for forming a rectangular parallelepiped box made of resin having an opening 31 at one end and transmitting radiation of various wavelengths to the outer peripheral surface of the box.
2c and 32d are planted, and an engagement receiving portion 33 is formed inside the inner case 30 near the opening 31.

Next, the card 40 holds the fluorescence dosimeter glass element 41, which has an inverted concave shape so as to cover the glass element 41 from the upper side as shown in FIGS. 1 (c) and 2 (b). Metal inner frame 42 and glass element 41
From the side opposite to the inner frame 42 across the glass element 41
And a metal outer frame 43 formed so as to cover a part of the inner frame 42. The outer frame 43 is provided with a locking portion 44 that engages with the engagement receiving portion 33 of the inner case 30. There is.

FIG. 2 is a cross-sectional view when the inner case 30 and the card 40 are assembled inside the outer case 20 in this order. FIG. 2A is a side cross-sectional view, and FIG. 9 is a cross-sectional view in a direction orthogonal to the illustrated arrow A direction in FIG.

Therefore, with the above configuration, for example, when the inner case 30 is inserted through the opening 21 of the outer case 20,
The filters 32a, 32b, 32 on the inner case 30 side
Although c and 32d serve as sliding surfaces, once the inner case 30 is once housed in the outer case 20, it is not necessary to take it in and out so often, and there is no joint on the outside.
Since a, 32b, 32c and 32d are not exposed to the outside, it is useful for protection of the filters 32a, 32b, 32c and 32d and the appearance of the case, and since there is no contact with the card 41, there is no contact with the card 41 and the filter 32a. , 32b, 32c, 32d can be prevented in advance. In addition, the filters 32a, 32b, 32
Since c and 32d are sandwiched between the outer case 20 and the inner case 30, the filters 32a, 32b and 32
There is no fear of peeling off c and 32d. Further, the card 41 holding the glass element 41 is housed inside the inner case 30, but the card 41 does not come into contact with other functional elements, grooves, or the like, but only comes into contact with the inner surface of the inner case 30. So there is a functional element or card 41
Can be prevented, and the reliability of the radiation measurement system mechanism can be improved. Moreover, the glass element 4 is attached to the inner case 30.
When the card 40 holding 1 is inserted, the locking portion 44 of the card 40 engages with the engagement receiving portion 33 of the inner case 30, so that positioning at the time of card insertion can be performed, and It is possible to prevent the card 40 from coming out. Further, the filters 32a, 32b, 32c, 3
Even when one of the filters in 2d is no longer needed,
It is not necessary to fill the groove with a spacer or the like.

In the above embodiment, the outer case 20 and the inner case 30 are used.
The filter 32a, 32b, 32c, 32d may be arranged inside the case by insert molding when the outer case 20 and the inner case 30 are integrally molded instead of the combination of the two parts.

Further, as shown in FIG. 3, after the filters 32a, 32b, 32c, 32d are planted on the inner surface of the outer case 20, the inner case 30 may be inserted into the filter-equipped outer case 20. In addition, the filters 32a, 32
Although metal filters such as tin and aluminum are used as b, 32c, and 32d, a plastic film filter 32 'may be used. In this case, the outer case 20 and the inner case 30 corresponding to the filter 32 '
An opening 50 is formed in the. In addition, the present invention can be modified in various ways without departing from the scope of the invention.

[Effect of the Invention] As described above, according to the present invention, the filter is embedded in the inner surface of the outer case or the outer surface of the inner case, so that the filter is sandwiched between the two cases, so that the filter is peeled off. The card does not come into contact with the filter and other functional elements, so damage to the filter and other functional elements can be prevented, and the seam filter is not exposed, which is also aesthetically pleasing. A fluorescent glass dosimeter can be provided.

[Brief description of drawings]

1 and 2 are sectional views showing an embodiment of the fluorescent glass dosimeter according to the present invention, and FIG. 1 is an exploded sectional view of the fluorescent glass dosimeter, and FIG. 2 (a). Is a side sectional view, FIG. 2B is a sectional view in a direction orthogonal to the direction of arrow A in FIG. 3A, and FIGS. 3 and 4 are views showing other embodiments of the present invention. Sectional views, FIGS. 5 and 6
The figures are sectional views of a conventional fluorescent glass dosimeter, respectively, and FIGS. 5 (a) and 6 (a) are side sectional views, and FIGS. 5 (b) and 6 (b) are respectively. It is sectional drawing of the direction orthogonal to the illustrated arrow A direction of FIG. 5 (a) and FIG. 6 (a). 20 ... Outer case, 21 ... Opening part, 30 ... Inner case, 31 ... Opening part, 32a, 32b, 32c, 32
d ... Filter, 33 ... Engagement receiving part, 40 ... Card, 41 ... Fluorescence dosimeter glass element, 42 ... Inner frame, 43 ... Outer frame, 44 ... Locking part.

Claims (1)

[Scope of utility model registration request] 1. A box-shaped outer case having an opening at one end, and an inner case inserted through the opening.
A box-shaped inner case having an opening formed at an end portion in the same direction as the outer case; a card holding a fluorescence dosimeter glass element housed in the inner case through the opening of the inner case; A fluorescent glass dosimeter, comprising: a filter buried in the inner surface of the case or the outer surface of the inner case.