JPH0631439Y2 - Glove box for radioactive material analysis - Google Patents

Description

[Detailed Description of the Invention] [Industrial Technical Field] The present invention relates to a glove box for analyzing radioactive substances for analyzing radioactive substances such as plutonium.

[Conventional technology]

Conventionally, as a glove box for radioactive substance analysis as described above, an airtight structure made of acid-resistant synthetic resin having a plurality of glove ports on the front surface and a bag port and a tunnel port for connecting an analytical sample transfer pipe on the side surface. 49-4, which is equipped with a box body that allows internal observation, and a body decompression device that decompresses the inside of the box body to a negative pressure state.
The one disclosed in Japanese Patent No. 2558 is known.

In this conventional glove box, an analytical sample of a radioactive substance is transferred by a transfer pipe connected to a tunnel port and carried into the box main body. Performs the analysis work of the sample by inserting your hand into the glove. Insert the analytical instruments (tweezers, reagent bottles, etc.) necessary for this analysis into the box body and take it out after use. It is supposed to be done from the bag port.

[Problems to be solved by the device]

However, in the above-mentioned conventional glove box, when the analytical instrument is put in the box body and when the used instrument is taken out of the body, the elongated glove box is made of an acid resistant synthetic resin sheet such as polyvinyl chloride. Pulling the bag out of the box body or pushing it inside the box body, work of sealing the bag part to seal the analytical instrument in the bag, and cutting the instrument sealed bag There is a problem that the operation and the like are required, and that the loading and unloading of the instrument is troublesome and time consuming, and the bag is sequentially cut off when the analytical instrument is put in and taken out. There was also a problem that it became shorter immediately and the frequency of replacement increased.

This invention solves the above-mentioned conventional problems and improves it so that the instrument for analysis can be carried into the box body easily, quickly, and safely from a carry-in tube other than the bag port on the body side. An object of the present invention is to provide a glove box for analyzing radioactive substances.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the glove box of the present invention, a carrying-in cylinder for inserting an analytical instrument such as tweezers into the box body is attached to the upper part of the box body in an airtight state, and an upper opening of the carrying-in cylinder is provided. A detachable instrument carry-in lid sealed with an O-ring is provided, and an instrument carry-out lid that can be detached by being held by a hand-inserted glove is provided at the lower end opening of the carry-in cylinder that hangs in the box body. A ventilation hole is formed in a portion of the carry-in cylinder located in the box body so that the inside of the carry-in cylinder and the inside of the box body have the same negative pressure in a covered state in a normal state in which the analytical instrument is not put in and out. did.

[Action]

According to the glove box configured as described above, the instrument loading lid is removed, the analytical instrument is inserted into the loading tube from the upper end opening, and after the loading lid is tightly fitted, the instrument loading lid at the lower end of the loading tube is held by the manually inserted glove. By removing the device from the inside of the box body, it is possible to easily and quickly carry the device into the box body. Further, the carry-in cylinder has a vent hole that opens into the box body, and the inside of the carry-in cylinder and the inside of the box body are in the same negative pressure state (decompressed state) in a covered state in a normal state where the analytical instrument is not put in and out. Therefore, even if the carry-in lid is removed when carrying in the equipment, there is no risk that the contaminated air in the box body will blow out, even if the carry-in lid is removed, only the outside air is sucked in by negative pressure. Work can be done safely.

The used analytical instruments contaminated with radioactivity are taken out of the box body by sealing and sealing with a bag on the side of the main body as in the conventional case, but this bag is used only when the instrument is taken out. Compared with the prior art which is used both when putting in and taking out, the working time is shortened, the number of times the bag is used can be doubled, and the frequency of replacement can be reduced.

〔Example〕

An embodiment of the present invention will be specifically described below with reference to the drawings. In the figure, reference numeral 1 is a box body made of an acid-resistant synthetic resin, for example, polyvinyl chloride, which is mounted and fixed on a pedestal 2. In addition to the conventional multiple (eg 4
Individual) and a bag port 4 and tunnel ports 5 and 6 for connecting analytical sample transfer tubes on the side surface, but the inside of the front surface 1a and the left and right side surfaces 1b and 1c of the main body can be easily observed. Use a transparent plate made of polyvinyl chloride, and use opaque ivory color plates made of polyvinyl chloride on the top and bottom surfaces 1d and 1e of the main body and the rear surface 1f of the main body to increase these lighting effects. By integrally fusion-bonding, the fusion-bonding corner portion is formed into a closed box structure in which an R curved surface is easily decontaminated.

An inspection port 7 is provided on the rear surface of the box body 1 with a minimum opening size so as to be located at the uppermost position in order to prevent dust from accumulating on the adhesive surface. The inspection port 7 is made of polychlorinated acid-resistant synthetic resin. It is closed with a transparent vinyl cover plate 8 and is kept airtight by a double seal and fastened and fixed with a large number of bolts 9. Further, the front surface 1a of the box body 1 having the glove port 3 has a tilt angle of 70 ° to 75 ° with respect to the horizontal plane in order to avoid collision with a face or the like when performing analysis work and facilitate visual work. It is inclined as shown in Figure 2.

10 is a stop valve as a main body pressure reducing device for reducing the pressure inside the box body 1 to a negative pressure state (for example, about -5 atm).
Exhaust filter chamber with 11, 12 is an air supply filter chamber for ventilation, this air supply filter chamber 12
The air supply pipe 13 has an air supply valve 14 and penetrates the upper surface 1d of the main body and hangs down inside the box main body 1. The lower end of the air supply pipe 13 is opened near the inner bottom surface of the main body, for example, at a position of about 10 cm on the bottom surface. ing. This is to improve ventilation efficiency. When the air supply / exhaust ports are opened in the upper part of the main body, the airflow flowing from the air supply ports to the exhaust ports takes the maximum distance, and Exhaust filter chamber as it becomes impossible to ventilate
The air supply pipe 13 having a diameter smaller than that of the exhaust port 10 is opened at the lower end near the inner bottom surface of the main body to relatively promote ventilation.

Reference numeral 15 denotes a carry-in cylinder, which is attached to the upper part of the box body 1 by welding in an airtight state, for inserting an analytical instrument such as tweezers necessary for the radioactive substance analysis work into the box body 1. A removable instrument carrying lid 17 sealed by an O-ring 16 is tightly fitted in the upper end opening as shown in FIG. 4, and a manual insertion is made in the lower opening of the carrying-in cylinder 15 that hangs inside the box body 1. An instrument carry-out lid 18 that can be held and removed by a glove (not shown) is sealed by an O-ring 19 and is tightly fitted in a detachable manner. Further, a small-diameter vent hole 15a is formed in the lower outer peripheral portion of the carry-in cylinder 15 located in the box body 1 so that the analytical instrument is not put in or taken out and the lid is in a normal state (state shown in FIG. 4). Thus, the inside of the carry-in cylinder 15 and the inside of the box body 1 are configured to have the same negative pressure.

Reference numeral 20 denotes a light window provided in the central portion of the upper surface of the box body 1. A transparent plate 21 made of polyvinyl chloride, which is an acid-resistant synthetic resin, is fitted into the light window 20, and its peripheral portion is welded in an airtight state. A fluorescent lamp 22, which is a lighting device, is installed on the transparent plate 21 so that the inside of the box body 1 can be illuminated in every corner. Reference numeral 23 is an upper panel which is erected and fixed at a position on the upper front side of the box body 1, and a water supply valve 24, a reagent valve 25, a differential pressure gauge 26, and an internal pressure alarm panel 27 are mounted on the upper panel 23 as shown in FIG. Has been done. In the figure, 28 is a drain trap, 29 is a lower panel, 30 is a power connection box, and 31 is an outlet.

Thus, in the glove box having the above-mentioned structure, the analytical sample of the radioactive substance is transferred by the transfer pipe (not shown) connected to the tunnel ports 5 and 6 and carried into the box body 1, and the inside of the box body 1 is transferred. While transparently observing the analysis sample from the front face 1a and the left and right side faces 1b, 1c, the analyst inserts his hand into the glove to perform the analysis work on the sample. , Reagent bottles, etc.) are carried into the box body 1 from the carry-in cylinder 15 described above. That is, the instrument carry-in lid 17 of the carry-in cylinder 15 is removed, an analytical instrument (not shown) is inserted into the carry-in cylinder 15 from the upper end opening, and the instrument at the lower end of the carry-in cylinder 15 is fitted after the carry-in lid 17 is tightly fitted. By holding the carry-out lid 18 with a manually inserted glove and removing it from the inside of the box body 1,
Bring it in. The used equipment is taken out by using the bag on the side surface of the main body as in the conventional case.

[Effect of device]

The glove box for analyzing radioactive substances of the present invention comprises the above-described carrying-in cylinder 15 and carrying-in / carrying-out lids 17, 18, so that the instrument carrying-in lid 17 is removed and the analytical instrument is placed in the carrying-in cylinder 15. Is inserted from the upper end opening, and after the carrying-in lid 17 is tightly fitted, the instrument carrying-out lid 18 at the lower end of the carrying-in cylinder 1 is held by a hand-inserted glove and removed from the inside of the box body 1. It can be carried in.

Further, the carry-in cylinder 15 has a vent hole 15a that opens into the box body 1, and the inside of the carry-in cylinder 15 and the inside of the box body 1 are in the same negative pressure state in a covered state in a normal state where the analytical instrument is not put in and taken out ( Since it is in a decompressed state, even if the carry-in lid 17 is removed when carrying in the equipment, the outside air is only sucked into the box body under negative pressure, and the contaminated air in the box body 1 may be blown out. Instead, the loading operation of the device can be performed safely.

In addition, used analytical instruments contaminated with radioactivity are sealed and taken out of the box body 1 by a bag on the side of the main body as in the conventional case, but this bag is used only when the instrument is taken out. Compared with the prior art which is used both when putting in and taking out the device, the working time is shortened, the number of times the bag is used can be doubled and the frequency of replacement can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a glove box for analyzing radioactive materials showing an embodiment of the present invention, FIG. 2 is a left side view of the same, FIG. 3 is a plan view of the same, and FIG. FIG. 1 ... Box body, 2 ... Stand, 3 ... Globe port, 4 ... Bag port, 5, 6 ... Tunnel port,
10 ... Exhaust filter chamber as the main body pressure reducing device,
15 …… carrying tube, 16,19 …… O-ring, 17 …… equipment carry-in lid, 18 …… equipment carry-out lid.

Claims (1)

[Scope of utility model registration request] 1. An internally observable box made of an acid-resistant synthetic resin in an airtight structure having a plurality of globe ports on the front surface and a bag port and a tunnel port for connecting an analytical sample transfer pipe on the side surface. In a glove box for radioactive material analysis, comprising a main body and a main body pressure reducing device for reducing the inside pressure of the box main body to a negative pressure state, an analytical instrument necessary for the radioactive substance analysis work is provided on the upper part of the box main body. A carrying-in cylinder for putting in the inside is attached in an airtight state, a removable instrument carrying-in lid sealed by an O-ring is provided at an upper end opening of the carrying-in cylinder, and a lower end opening hanging in the box body of the carrying-in cylinder. An instrument carry-out lid that can be attached and detached by holding it with a hand-inserted glove is provided, and a ventilation hole is made in the portion of the carry-in cylinder located inside the box body for analysis. Glove box for radioactive analysis, wherein the interior of the inner and the box body of the carrying tube at tegmental state of peacetime without out the instrument was set to the same negative pressure.