JPS5845584A - Honeycomb structure material for collimator - Google Patents

Abstract

PURPOSE:To make the dissolution treatment of core materials unnecessary, by coating core materials consisting of plastic materials, which are transparent to an objective radiation, with lead or lead alloy. CONSTITUTION:Core materials 1 consisting of plastic materials such as vinyl chloride and polyethylene which are difficult to absorb the radiation such as gamma rays are prepared, and thin walls 2 consisting of lead or lead alloy are formed properly on core materials 1, thus forming a honeycomb structure material for collimator. By the use of this material, the dissolution treatment of core materials required for conventional composite wires is not necessary at all.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a fine honeycomb structure of a collimator used, for example, with a scintillation camera, and in particular to a material used for manufacturing a honeycomb structure with a focal point.

A collimator for a scintillation camera is used to pass only radiation emitted from spatially distributed radioactive isotopes in a desired direction, and in general, the collimator is a collimator that is opaque to the radiation, such as specific gravity and atomic number. It is formed by using a large material, especially lead or lead alloy porcelain from the viewpoint of ease of processing and economy, and providing fine straight holes in it. It is extremely difficult to create fine holes uniformly and densely by machining, so they are formed by metallurgically joining corrugated lead or lead alloy plates of appropriate shapes, or Wire rods with a thin alloy plate as the outer sheath and a core made of, for example, aluminum material, which is more easily soluble in certain chemicals, etc., are cut into appropriate lengths, tied and aligned, and then appropriately connected to the adjacent wire rods. It is becoming common practice to properly melt and remove only the core material after joining the two. However, if a corrugated lead plate is used, for example, voids are likely to be formed at the joint, which causes a problem of radiation leakage, and because the lead plate is extremely thin, manufacturing itself is relatively difficult. On the other hand, the method using a composite wire is not only relatively expensive, but also requires the operation of melting the 'r5 material, which is relatively complicated and is accompanied by difficulties such as subsequent waste liquid treatment.

The purpose of the present invention is to manufacture a honeycomb structure that is inexpensive and has the same high precision as conventional composite wire, without the problem of radiation leakage and without the need to melt the core material. Our goal is to provide the materials we can.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a partial cross-sectional view of an example of a raw material for a honeycomb structure according to the present invention. In Fig. 1, a core material 1 made of a plastic material having a hexagonal cross section, such as vinyl chloride, polyethylene, etc., which is difficult to absorb radiation such as gamma rays, is prepared, and a thin lead material 1 is prepared. Alternatively, the material of the present invention is formed by appropriately forming the wall 2 of a lead alloy. In this example, the wall thickness of lead or lead alloy is approximately 0.2 ml, and is formed by extrusion coating lead or lead alloy onto a core material 1 made of hard vinyl chloride.

FIG. 2 is a top view of a portion of a honeycomb structure using this material. That is, after cutting the materials prepared according to the present invention into appropriate lengths, they are aligned and integrated using a suitable adhesive.

When the material of the present invention is used, there is no need for melting the core material, which is required when using conventional composite wires. Furthermore, since the core material itself is inexpensive, it is economically advantageous, and therefore a highly accurate collimator can be manufactured extremely easily. In addition,:
Materials used as R5 materials are not limited to vinyl chloride, polyethylene, etc.

Any material can be used as long as it is relatively transparent to the target radiation and has appropriate rigidity. Further, the cross-sectional shape of the material is not limited to a hexagonal shape, but may be arbitrary.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a material according to the present invention, and FIG. 2 is a top view of a portion of a honeycomb structure using the material of the present invention. 1... Core material 2... Lead or lead alloy coating 71
Mouth 2 figure

Claims (1)

[Claims] It has a cross-sectional shape that allows it to be arranged with relatively no gaps,
A honeycomb structure material for a collimator, consisting of a core material made of a plastic material that is relatively transparent to the target radiation, and a coating made of lead or a lead alloy that covers this core material.