JPH0850197A - Glove port shielding body for glove box - Google Patents

Abstract

PURPOSE:To provide an improve glove port shielding body for glove box in which the radiation leaked from a glove port can be surely shielded at glove work, and the glove need not be drawn to the outside of the glove port after the glove work is finished, so that the radiation from a radioactive material adhered to the glove can be effectively shielded. CONSTITUTION:This glove port shielding body is formed of a cylindrical part 1 to be inserted into a glove port, a glove port mounting collar part 12 formed on the outer circumference of the outside end opening pan-t of the cylindrical part 11, an inside shielding plate 13 for blocking an opening part formed on the inside end opening part of the cylindrical part 11, and an outside shielding plate 14 for blocking an opening part formed near the cylindrical pan-t outside end opening part with a space from the inside shielding plate 13. The cylindrical part 11, the collar part 12, and the inside and outside shielding plates 13, 14 are integrally molded from rubber or synthetic rubber, and the inside and outside shielding plates 13, 14 have a number of radial cut lines 15 from the center parts to the outside, the cut lines 15 are formed so that they can be freely cut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glove port shield for effectively shielding radiation leaking from a glove port to which a base end of a glove used in a glove box handling radioactive substances is attached. Is.

[0002]

2. Description of the Related Art Glove boxes are widely used for handling relatively small amounts of radioactive materials, and workers work in the boxes via rubber gloves attached to glove ports.

As shown in FIG. 5, such a glove box is provided with a large number of transparent front windows 1 on the front surface of the box so that an operator can visually recognize the inside of the box. A cylindrical globe port 2 for mounting is airtightly attached to a part of the front window. After the base end of the glove is attached to the outer circumference of the glove port, the operator pushes the finger-like part at the tip of the glove into the box and inserts the worker's arm into the glove to perform the work.

Nuclear fuel materials such as plutonium are exposed to radiation (γ
In order to emit the radiation, the front window 1 provided on the front surface of the glove box uses a lead-containing glass or an acrylic plate having a large shielding effect against radiation to prevent the worker from being exposed to the radiation. further,
In order to prevent radiation exposure from the glove port 2, workers wear lead aprons to perform their work.

It is also considered to attach the shield 3 to the glove port in order to reduce the leakage of radiation from the glove port 2 during the glove work, and a glove port shield for this purpose is proposed by the same applicant as the present application. It has been carried out (Actual Kaihei 2-99397). As shown in FIGS. 6 and 7, the shield 3 is composed of a peripheral body portion 4 to be attached to the outer peripheral portion of the glove port, and a top plate portion 5 formed in a loose conical shape that closes one end opening of the peripheral body portion 4. Part 5 includes
A large number of radial cut lines 6 are provided from the central portion toward the outside so that these cut lines can be freely separated. The shield 3 is made of rubber or synthetic rubber, and generally contains lead for effective shielding.

As shown in FIG. 5, the glove port shield 3 is attached to the glove port 2 of the glove box to prevent radiation from leaking from the glove port. At the time of work, when the worker's arm is pushed in from the outside of the glove port so as to pierce the top plate portion 5 of the shield 3, the cut line 6 of the top plate portion is expanded and the arm can be inserted into the glove 7. At the end of the glove work, pull out the glove 7 after the worker's arm is pulled out to the outside of the shield 3 as shown in FIG.
The left and right gloves are tied outside the shield so that the negative pressure in the glove box does not pull the glove 7 into the box.

[0007]

The glove port shield in the prior art of the earlier application as described above has an effect of preventing the leakage of radiation from the glove port to some extent. If the content is high (0.6 mm or more in lead equivalent), the flexibility of the shield will be reduced, which will hinder the glove work. Therefore, it is impossible to shield the glove box with a high dose equivalent rate. Becomes

After the glove work is completed, it is necessary to pull the glove out of the shield to prevent the glove from being pulled into the glove box by the negative pressure of the glove box. It is not possible to shield radiation from radioactive materials such as nuclear fuel materials.

Therefore, the present invention can be easily attached to the glove port of the glove box, can reliably shield the radiation leaking from the glove port during the glove work, and does not pull the glove out of the glove port after the glove work is completed. The present invention has been made for the purpose of providing an improved glove port shield for a glove box, which can effectively shield radiation from radioactive substances attached to the glove.

[0010]

That is, a glove box shield for a glove box according to the present invention is provided with a cylindrical portion to be inserted into the inside of the glove port and a glove port mounting member formed on the outer periphery of an outer end opening of the cylindrical portion. A collar, an inner shield plate that closes the opening formed in the inner end opening of the cylindrical portion, and a opening that is formed near the outer end opening of the cylindrical portion with a space from the inner shield plate An outer shield plate, wherein the cylindrical portion, the flange portion, and the inner and outer shield plates are integrally molded of rubber or synthetic rubber. It is characterized in that radial cut lines are provided and these cut lines can be freely separated.

It is desirable that the rubber or synthetic rubber as the material of the glove port shield contains lead having a radiation shielding effect.

[0012]

According to the glove port shield of the present invention, since the inner shield plate and the outer shield plate can perform double shielding,
More effective shielding of radiation can be achieved as compared with shielding by a single top plate in the prior art.

Further, the cylindrical portion between the inner shield plate and the outer shield plate can be used for accommodating the gloves. If the glove is stored in this storage part, the glove will not be drawn into the box due to the negative pressure inside the glove box. Therefore, it is not necessary to pull out the glove after the glove work to the outside of the glove port shield, so that the radiation from the radioactive substance attached to the glove can be effectively shielded.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a glove port shield 10 of the present invention.
1A is a left side view,
1B is a front view and FIG. 1C is a right side view. FIG. 1B also shows a cross section with a part cut away.

Cylindrical portion 1 fitted inside the glove port
A flange portion 12 is formed on the outer periphery of the outer end (outside of the glove box) of 1 to be attached to the glove port, and is attached to the inner end of the cylindrical portion 11 (inside the glove box). An inner shield plate 13 that closes the inner wall is formed. Further, an outer shield plate 14 is formed near the outer end opening of the cylindrical portion 11 at a distance from the inner shield plate 13 to close the opening.

As shown in FIG. 1A, the inner shield plate 13 has a large number of radial cut lines 15 extending from the center to the outside.
1C is formed on the outer shield plate 14 as well.
A large number of radial cutting lines 15 are formed as shown in FIG. As shown in FIG. 6, when the operator's arm is pushed in so as to break through the shielding plates 13 and 14, these cut lines 15 are spread and the arm can be inserted into the glove. It is similar to the conventional globe port shield.

The cylindrical portion 11, the collar portion 12, the inner shield plate 13 and the outer shield plate 14 are integrally molded of synthetic rubber containing lead (lead equivalent of 1 mm).

When using this globe port shield 10, after attaching the base end portion 21a of the globe 21 to the globe port 20 as shown in FIG.
The cylindrical portion 11 of the glove port 2 from the inner shield plate side 13
Then, the flange portion 12 of the shield is attached to the globe port 20 from above the globe base end portion 21a.

Next, as shown in FIG. 3, the operator's arm 22 is inserted into the glove port 20, the cut lines 15 of the outer shield plate 14 are expanded, and the cut lines 15 of the inner shield plate 13 are further expanded to expand the glove. 21 Insert up to the finger part at the tip. Normal glove work can be performed in this state.

When the glove work is completed, the glove 21 after pulling out the arm is placed in the cylindrical portion 11 between the inner shield plate 13 and the outer shield plate 14 of the shield 10 as shown in FIG. It is desirable to tie the glove 21 in order to store it and prevent the glove 21 from being drawn into the box by the negative pressure inside the glove box.

[0021]

According to the glove port shield of the present invention having the above-mentioned structure, the following effects can be obtained.

(1) Due to the double structure of the inner and outer shield plates, it is possible to effectively shield the leakage of radiation from the globe port. When the conventional glove port shield (shielding with one top plate) shown in FIGS. 5 and 6 is used, a shield (lead equivalent 0.6 mm) is attached to the glove port in order to reduce the exposure dose to the worker. After mounting, the worker wears a lead apron (lead equivalent 0.35 mm) to carry out the work. This lead apron weighs 4 kg
There is a large physical burden on the worker.

On the other hand, the shield (lead equivalent 1.0 mm) of the double shield plate structure of the present invention has the above-mentioned conventional globe port shield (lead equivalent 0.6 mm) and the lead apron (lead equivalent 0. 35mm) and the above shielding effect, it is not necessary for workers to wear lead aprons.
The physical burden on the operator can be greatly reduced. Further, the dose equivalent rate from the glove port when there is no shield in the glove port section is 500 μSv / h, whereas the double-structure shield provided with the inner and outer shield plates of the present invention is attached. In this case, the dose equivalent rate from the glove port is significantly reduced to 8 μSv / h, and it becomes possible to effectively shield the radiation from the glove box that handles nuclear fuel materials such as plutonium.

(2) Since the glove can be housed in the shield after the work of the glove, the radiation from the radioactive substance attached to the glove can be effectively shielded. While the dose equivalent rate from the glove when the contaminated glove is pulled out to the outside of the glove port shield is 150 μSv / h, the gap between the inner shield plate and the outer shield plate in the glove port shield of the present invention is Dose equivalent rate from the glove port when stored in the storage section of 8μSv / h
Therefore, it is possible to effectively prevent the risk that the dose equivalent rate of the space outside the glove box increases due to the radiation emitted from the radioactive substance attached to the glove. Further, as a result of being able to store the glove in the shield, it is possible to prevent the glove from being deteriorated by ozone and being damaged by contact with an object.

[Brief description of drawings]

FIG. 1 is a left side view (A), a front view (B) and a right side view (C) showing an embodiment of a glove port shield of the present invention.
Is. The front view (A) also shows a sectional view with a part cut away.

FIG. 2 is a cross-sectional view showing a state in which the globe port shield is attached to the globe port.

FIG. 3 is a cross-sectional view showing a state where a glove port shield is attached to the glove port and a glove work is being performed.

FIG. 4 is a cross-sectional view showing a state in which the glove is housed in the glove port shield at the end of the glove work.

FIG. 5 is a perspective view showing a front part of the glove box.

FIG. 6 is a plan view showing an example of a conventional globe port shield.

7 is a cross-sectional view showing a state in which the conventional globe port shield of FIG. 6 is attached to a globe port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Globe port shield 11 ... Cylindrical part 12 ... Collar part 13 ... Inner shield plate 14 ... Outer shield plate 15 ... Cut line 20 ... Globe port 21 ... Globe

Claims (2)

[Claims] 1. A cylindrical portion to be inserted into the inside of the glove port, a glove port mounting collar formed on the outer periphery of the outer end opening of the cylindrical portion, and the opening formed in the inner end opening of the cylindrical portion. An inner shield plate for closing the opening, and an outer shield plate formed in the vicinity of the outer end opening of the cylindrical portion at a distance from the inner shield plate for closing the opening. The shield plate is integrally molded with rubber or synthetic rubber, and the inner and outer shield plates are provided with a large number of radial cut lines from the central portion to the outside so that these cut lines can be freely separated. A glove port shield for a glove box, which is configured as described above. 2. The glove port shield for a glove box according to claim 1, wherein lead is contained in a rubber or a synthetic rubber which is a material of the shield.