JP2583765Y2 - Fluorescent glass dosimeter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A fluorescent glass dosimeter (hereinafter referred to as a dosimeter) of the present invention relates to a dosimeter suitable for use in small-scale facilities.

[0002]

2. Description of the Related Art The structure of a conventional dosimeter will be described with reference to FIG. The dosimeter described here is for detecting γ-rays, X-rays, and thermal neutrons.

A plastic filter 204 having an opening in the same direction as the filter case 206 is provided inside the filter case 206 having one end opened. On the outer periphery of the plastic filter 204, three different types of metal filters, Sn filters 205a, and Al filters 205
b, Cd filter 205c, plastic filter 2
04 is buried and wound in the plastic filter 204 flush with the surface. On the other hand, the glass element 201 is sandwiched between two types of metal supporting frames 202 having different shapes to form a reading card 203. The reading card 203 is inserted into the opening of the plastic filter 204 and fitted to the plastic filter 204 to form a dosimeter.

In order to mount the dosimeter on a human body or the like, dust or the like which may cause an error in exposure dose enters the inside of the dosimeter in a holder 208 provided with a mounting clip 207 on an arbitrary side surface. It was housed with the opening facing down so that there was no opening.

[0005] In the above-described configuration, when the exposure dose is detected, the method of taking out the dose is as follows. The dosimeters taken out of the holder 208 are aligned in a certain direction, set in a jig dedicated to the reading device, and set in a metal support frame. The L-shaped portion protruding from the opening side of the filter case 206 of the body 202 is read by the reading card 20.
3 Pull out with a drawer jig. The method of taking out the reading card 203 of the dosimeter other than the detection of the exposure dose is as follows.
First, the dosimeter is removed from the holder 208, and the L-shaped portion of the metal support frame 202 protruding toward the opening of the filter case is hooked with a fingertip to pull out the reading card.

This dosimeter has been used to measure the exposure of hundreds and thousands of people and places in large-scale facilities. At the time of exposure dose reading, the filter case 206 is used to collect dosimeters from people and places all at once, and to compare dosimeters with people, etc. The bar code was read and managed by providing a hole code on the card 203. In other words, this dosimeter is based on the premise that after the dosimeter is set in the dedicated reading device, the reading operation of the reading card 203 is automatically performed as described above. The structure made it difficult to take out the card 203.

[0007]

[Problems to be Solved by the Invention] There is a need for radiation measurement not only in large-scale facilities such as a nuclear power plant, but also in small and medium-sized facilities such as hospitals and research laboratories that require the control of exposure of several to tens of people. However, the above dosimeter has a structure suitable for reading the exposure dose of a large number of dosimeters in a large-scale facility at a time, and the total number of dosimeters used in a small-scale facility or a limited area is limited. If the above dosimeter was used in a small place, a large-sized reading device with a built-in reading card take-out mechanism would be required, which would cause considerable unreasonability in terms of installation space and installation costs, and demands for increased reading frequency and It has not been possible to meet the demand for timely information on the dose of each work. For this, only the reading card dose reading mechanism is installed,
It is conceivable that the reading card is taken out and set in the reading device manually.However, the above dosimeter is difficult to take out the reading card due to its structure, so it takes time and effort to handle the reading card itself. There is a possibility that accurate measurement of exposure dose cannot be performed due to contamination of the glass element. Also, since the dosimeter must be set on the above jig when measuring the exposure dose, a filter case without clips is required to simplify the structure of the above jig. The number of parts required and forming the dosimeter was large.

Accordingly, the present invention has been made in view of the above circumstances, and has as its object to provide a dosimeter which has a simple structure and can easily measure the dose.

[0009]

Means for Solving the Problems A box-shaped case having one end opened and a notch provided on each of the opposing surfaces on the opening side, and a clip provided on an arbitrary outer surface of the box-shaped case A filter is buried so as to make the surface height equal to a surface in contact with the inner surface of the box-shaped case, has an opening in the same direction as the box-shaped case, and is longer than a surface facing the opening of the box-shaped case. An inner case having a length not to be caught by the notch, a glass element capable of being inserted into an opening of the inner case and capable of detecting an exposure dose, an inner surface of the box-shaped case holding one end of the glass element, and the inner case. And a glass element holder in contact with the end on the opening side.

[0010]

By providing a notch in the box-shaped case, the glass element holder fitted in the box-shaped case can be picked up by a finger and pulled out. By providing the clip on the outer surface of the box-shaped case, it can be mounted on a human body or the like. By setting the length of the inner case in the glass element insertion direction to a length that cannot be seen from the notch of the box-shaped case, the glass element in contact with the opening side end of the inner case is not exposed from the notch, and the glass element is removed. It can protect against direct external impact and fouling.

[0011]

EXAMPLES Examples of the present invention with reference to FIGS. 5 to FIG. 1-1 not be described in detail.

(Embodiment 1) The embodiment shown in FIGS. 1-1 to 1-3 relates to a dosimeter for detecting γ-rays, X-rays and thermal neutrons. The dosimeter of the present invention has a rectangular parallelepiped box-shaped case 101 made of plastic having one end opened and a notch provided on each of the opposing surfaces on the opening side,
A clip 102 that can be attached to a human body or the like is provided on an arbitrary outer surface of the box-shaped case 101, and the box-shaped case 1
An inner case 104 having an opening for inserting the glass element 103a on the same side as the opening of the box-shaped case 101 was brought into contact with the inner surface of the case 01. On the outer periphery of the inner case 104, a metal filter 112a, 1 of Sn, Al, or Cd is provided.
12b and 112c were fitted on the surface of the inner case 104 so that the surface height was the same as that of the inner case 104. On the other hand, the glass element 103a is formed by adhering a part of the glass element 103a to a glass element holder 105a made of resin by using an adhesive or the like and forming a reading card 106a. A projection 107 is provided on the surface of the glass element holder 105a in contact with the box-shaped case 101, and the box-shaped case 1 is provided.
01 is provided with a concave portion 108 corresponding to the convex portion 107,
When these two are combined, the convex 107 and the concave 108
And the box-shaped case 101 of the reading card 106a
From falling off. When the reading card 106a is fitted into the box-shaped case 101, the glass element 103a
In order to protect the glass element holder 105a from external impact, only the glass element holder 105a can be seen from the notch. Here, it is preferable that the arbitrary outer surface of the box-shaped case 101 provided with the clip 102 is a surface having the largest area on the outer surface of the box-shaped case 101 from the viewpoint of accurately measuring the exposure dose. Further, the box-shaped case 10 provided with the notch
It is preferable that the surface having the largest area on the outer surface of the box-shaped case 101 is also provided for any one of the opposing surfaces in order to easily take out the reading card 106a.

As described above, the dosimeter of the present invention simplifies the assembly structure of the reading card 106a and the box-shaped case 101, and the reading card 106a can be taken out of the box-shaped case 101 with the dosimeter mounted. With this configuration, an accurate dose can be easily measured without a risk of touching the glass element 103a. Since the clip 102 to be attached to a human body or the like can also be provided in the box-shaped case 101 for protecting the glass element 103a, a holder for attaching a dosimeter to a human body or the like as in the related art is not required.

By using the Sn filter 112a and the Al filter 112b as the metal filters of the inner case in the above configuration, a dosimeter capable of detecting γ-rays and X-rays can be obtained (FIG. 2). The metal filter of the inner case is S
n filter 112a and Al filter 112b and 38 μm
By using the PETP filter 112d and the 250 μm PETP filter 112c, a dosimeter capable of detecting γ-rays, X-rays, and β-rays can be obtained (FIG. 3).

(Embodiment 2) In the embodiment shown in FIG. 4 , the glass element 10 constituting the reading card 106a of Embodiment 1 is used.
This is a modification of the method of joining the glass element holder 3a and the glass element holder 105a. In this joining method, the glass element 103b is held by the glass element holder 105b without bonding the glass element 103b and the glass element holder 105b with an adhesive or the like.

The shape of the glass element 103b is perpendicular to the direction in which the reading card 106b is inserted into the box-shaped case 101 on the side where the glass element 103b is sandwiched.
b The groove 109b is provided over the entire width. The structure of the glass element holder 105b is such that a notch recess having a U-shaped surface facing the glass element 103b is provided on the side sandwiching the glass element 103b.
Has a peak portion 110b corresponding to the groove portion 109b provided in the groove. The glass element 103b and the glass element holder 105b are assembled by sliding the glass element 103b from an opening on the side surface of the glass element holder 105b facing the glass element 103b to obtain a reading card 106b. .

By changing the structure of the glass element 103b and the glass element holder 105b as described above, the glass element 103b exposed to a certain amount can be replaced with the glass element 103b not exposed, and the glass element exposed to a certain amount can be replaced. By subjecting 103b to a heat treatment, it can be used again as a glass element 103b for a dosimeter. Further, since the reading card 106b is of an assembling type, when the glass element 103b and the glass element holder 105b are damaged, it is only necessary to replace the parts alone.

(Embodiment 3) In the embodiment shown in FIG. 5 , the glass element 103a and the glass element holder 105a constituting the reading card 106a of the first embodiment are similar to the second embodiment.
This is a modification of the joining method, this joining method,
The glass element 103c is held by a glass element clip 111 shaped like washing scissors.

The shape of the glass element 103c is a side surface in the insertion direction of the glass element 103c and the glass element 103c.
A groove 109c similar to that of the second embodiment is formed on both sides of the thin side surface of c. Glass element clip 1
The configuration of 11 is a configuration similar to a general washing scissors,
A glass element 10 is attached to one end of the glass element clip 111.
It has a pair of holding portions for holding 3c. The pair of holding portions are recessed into a concave shape in order to hold the glass element 103c.
A peak 110c corresponding to the groove 109c of 3c is provided to sandwich the glass element 103c. When the crest 110c and the groove 109c are fitted, the glass element 1 to be clamped is
The width 03c and the length between the recesses 112 (illustration A) were set to be the same length. At this time, the side surfaces of the glass element clip 111 are parallel, and the box-shaped case 1
01 without any gap. The length between the pair of knobs at the other end of the glass element clip 111 (shown in B) is shorter than the length between the recesses 112. This is because the reading card 106 is
This is because a large number of knobs are exposed from the cutouts of the box-shaped case 101 when taking out c, so that it can be easily taken out.

By changing the structure of the glass element 103c and the glass element clip 111 as described above, the glass element 103c exposed to a certain amount can be replaced with the glass element 103c not exposed, and the glass element exposed to a certain amount can be replaced. By subjecting 103c to heat treatment, it can be reused as a glass element 103c for a dosimeter. In addition, since the reading card 106c is of an assembling type, when parts of the glass element 103c or the glass element clip are damaged, it is sufficient to replace only the part.

Originally, a glass dosimeter has the property of accumulating the exposure dose and measuring the exposure dose as many times as possible. Even if the patient is taken out and measures the amount of exposure, the periodic measurement is not disturbed. Therefore, the dosimeter of the present invention has a structure that makes it difficult for the exposed person who is not used to handling the dosimeter to adhere the dirt to the glass element when taking out the reading card, so it can also respond to personal needs Becomes

[0022]

According to the present invention, the reading card can be taken out of the box-shaped case with the dosimeter mounted by simplifying the assembly structure of the reading card and the box-shaped case. Accurate exposure dose can be easily measured without danger of touching. Since a clip to be attached to a human body or the like can also be provided in a box-shaped case for protecting a glass element, a holder for attaching a conventional dosimeter to a human body or the like is not required. Since the cost can be reduced by reducing the number of parts, it can be easily introduced into a small-scale facility or the like, and the exposure dose can be accurately measured by the glass dosimeter. In addition, since the glass element is configured not to be seen from the cutout of the box-shaped case, the glass element can be protected from direct external impact and contamination.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view illustrating an embodiment of the present invention.

FIG. 1-2 is a conceptual diagram illustrating an embodiment of the present invention.

FIG. 1-3 is a conceptual diagram illustrating a reading card according to an embodiment of the present invention.

FIG. 2 is a conceptual sectional view illustrating another embodiment of the present invention.

FIG. 3 is a conceptual sectional view illustrating another embodiment of the present invention.

FIG. 4 is a conceptual view showing a glass element and a glass element holder according to another embodiment of the present invention.

FIG. 5 is a conceptual view showing a glass element and a glass element clip according to another embodiment of the present invention.

FIG. 6 is a conceptual sectional view showing a conventional fluorescent glass dosimeter.

[Explanation of symbols]

101: box-shaped case 102: clip 103a,
b, c: glass element 104: inner case 105a,
b: glass element holder 106a, b, c: read card 107: convex part 108: concave part 109b, c: groove part 110b, c: mountain part 111: glass element clip
112 ... hollow

Claims (1)

(57) [Scope of request for utility model registration] 1. A box-shaped case having an opening at one end and a cutout provided on each of opposing surfaces on the opening side, a clip provided on an arbitrary outer surface of the box-shaped case, and the box A filter is embedded in a surface in contact with the inner surface of the mold case so as to have the same surface height, and has an opening in the same direction as the box-shaped case. An inner case having a length that does not hang on the inner case; a glass element that can be inserted into the opening of the inner case to detect the amount of exposure; an inner surface of the box-shaped case holding one end of the glass element and the opening side of the inner case; A fluorescent glass dosimeter comprising a glass element holder in contact with an end of the fluorescent glass dosimeter.