JPH0324498A - Lead shield for radiation shielding - Google Patents

Abstract

PURPOSE:To make installation, disassembling and recovering work easy by connecting and fixing a plurality of hollow shield boxes each other to the periphery of a piping, placing flange parts inbetween. CONSTITUTION:Shield boxes 12a to 12c are arranged so as to surround a piping 10 through which substances such as radioactive liquids, fors and the like, flow away, and a flange part 14 is formed at each end edge of the boxes and also, with the flange part 14, the shield boxed 12a to 12c are connected one another. In case of an installation, empty shielding boxes 12a to 12c not filled with lead particles 20,and an iron shielding plate 16, are fixed around the piping 10. A radiation monitoring detector 18 is attached to a predetermined position of the shield 16. After that, each outlet hole 24 of the shield boxes 12a to 12c is closed, the lead particles 20 is filled from each filling hole 22 and fills insides of the boxes. In this way, the same condition as a condition that a lead plate corresponding to a depth of the boxed is place, is configured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lead shield for radiation shielding, and is particularly used to reduce radiation exposure from piping through which radioactive liquids and mist flow, or to prevent background radiation. This invention relates to a lead shield for radiation shielding to reduce the effects of radiation.

[Conventional technology]

For example, when using a radiation monitor detector to measure the radiation dose inside piping through which radioactive liquid or mist flows, it is necessary to Shield piping with lead.

The conventional lead shield, for example, has two
It had a structure in which lead plates weighing approximately 0 kg were stacked in several tiers to obtain the necessary shielding effect.

[Problem to be solved by the invention]

However, in the conventional lead shield for radiation shielding described above, lead plates are stacked in many tiers, so during installation, disassembly after installation, and restoration work, it is necessary to remove gaps between the lead plates. There was a problem in that the adjustment work required a large amount of man-hours.

An object of the present invention, which has been made in view of the above-mentioned actual state of the prior art, is to provide a radiation shielding ship shield that is easy to install, disassemble, and restore.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a plurality of shield boxes whose interiors are hollow and sealed, and which can be filled and discharged with lead particles, in a circle around the outer periphery of piping through which radioactive objects flow. It is divided into a plurality of parts in the circumferential direction and arranged, and the parts are connected to each other by a flange part.

[Effect]

According to the above means, the plurality of internal hollow shield boxes are connected and fixed to each other around the pipe via the flange portion. By filling these shield boxes with lead grains, the entire shield box functions as a thick lead plate. Therefore, work such as installation, disassembly, and restoration can be performed in an empty and lightweight state, making the work easier.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of a lead shield for radiation shielding according to the present invention.

Piping 10 through which objects such as radioactive liquids and mist flow
Shield boxes l2a, 12b% to surround
12c is disposed, and a flange portion 14 is provided at each end edge of the flange portion 12c.
The shield boxes 12a, 12b, and 12C are connected to each other by the seven flange portions 14.

The shield boxes 12a and 12b have inner surfaces processed to have a concave shape along the pipe 10, and are arranged opposite to each other so as to sandwich the pipe 10, and a rectangular box-shaped shield box 1 is provided on the back.
2c is provided. A plurality of iron plate shields 16 are attached to the shield box 12C at opposing positions, and the radiation monitor detector 1 is attached to the iron plate shield l6.
8 is attached.

Each of the shield boxes 12a, 12b, and 12c is made of an iron plate to be hollow and sealed, and a loading port 22 for loading lead particles 20 into the box is provided at the top of each shield box. Moreover, in order to take out the loaded lead particles 20, a discharge port 24 is provided in each shield box.

In the above structure, when installing, lead particles 2
Empty shield boxes 12a, 12 that are not loaded with 0
b, 12c and the iron plate shield 16 are fixed around the pipe IO. This fixing is done using bolts (
Furthermore, it is done using a nut). Also, iron plate shield 16
The radiation monitor detector 18 is mounted at a predetermined position.

Next, the discharge ports 24 of each of the shield boxes 12a, 12b, and 12C are closed, and lead particles 20 are loaded from each loading port 22 to fill the boxes. This creates the same condition as installing a lead plate corresponding to the depth of the box.

Further, in order to disassemble the box, the discharge port 24 is opened, and the lead particles 20 in the shield boxes 12a, 12b, and 12c are allowed to fall naturally, and all the lead particles 20 in the box are discharged to empty the inside. After that, the radiation monitor detector 18 is removed from the iron plate shield 16, and then the shield box 12a,
12b, 12c and the iron plate shield l6 can be removed from the pipe 10.

Furthermore, for restoration work, the work shown in the above-mentioned installation or disassembly work process may be used as needed.

Note that in the above embodiment, the lead shield is formed into two shield boxes 12a and 12b each having a recess formed on the inner surface.
Although the present invention is made up of three blocks including the shield box 12C and the shield box 12C having a flat inner surface, the present invention is not limited thereto.

For example, the shapes shown in FIGS. 2 and 3 may be used.

The example shown in FIG. 2 uses shield boxes 26 and 28 that are divided into two parts in the circumferential direction, and the two parts are connected by a flange part 30. In this case, the radiation monitor detector 18 is attached to the flat surface of the shield box 28.

In addition, FIG. 3 shows shield boxes 32a, 32b, 32 each having a uniform width (depth) and a semi-cylindrical shape divided into three parts in the circumferential direction.
C are connected to each other by a flange portion.

Note that there is no limit to the number of divisions, and it can be any number depending on the diameter of the pipe 10. Moreover, its shape is not specified as long as it achieves a desired level of radiation shielding.

Furthermore, in the above embodiments, the structure of a lead shield was shown to avoid the influence of background radiation on the radiation monitor detector, but in addition, it is also possible to install a lead shield structure in order to avoid the influence of background radiation on the radiation monitor detector. The present invention can also be applied to a lead shield for radiation shielding aimed at reducing radiation exposure from.

C Effects of the Invention] As explained above, according to the present invention, a plurality of shield boxes each having a hollow and sealed interior and capable of being filled with and discharged lead particles are connected to a pipe through which a radioactive object flows. The structure is divided into multiple parts in the circumferential direction of the outer periphery, and they are connected by flanges, so installation, disassembly, and restoration work can be done in an empty, lightweight state and in blocks. and each task can be performed easily.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of a lead shield for radiation shielding according to the present invention, and FIGS. 2 and 3 are sectional views showing a second embodiment and a third embodiment of the present invention. 10... Piping, 12a, 12b, 12c, 2g, 32a, 32b, 32
C...Shield box, Fig. 1 20 10...Piping 12a, 12b, 12c-...Nold box 6゛...Iron plate notch 20...Lead level 22...Loading port 24...Discharge port flange part, iron plate shield, lead grain, loading port, discharge port.

Claims (1)

[Claims] (1) A plurality of shield boxes, each of which is hollow and airtight and capable of filling and discharging lead particles, are divided into a plurality of shield boxes in the circumferential direction of the piping through which radioactive objects flow. 1. A lead shield for radiation shielding, characterized in that the lead shield is provided with a flange portion and is connected to each other by a flange portion.