JPS60129249A - Honeycomb structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a honeycomb structure used as a collimator for a scintillation camera.

(B) Prior art A conventional honeycomb structure is, for example, disclosed in Japanese Patent Application Laid-Open No. 52-1338.
72, JP-A-53-1.2C179, JP-A-55-7f
As shown by i72, it has a structure made of a bundle of small diameter pipes made of lead alloy. - Such a honeycomb structure is formed by bundling aluminum cores coated with lead alloy, adhesively fixing them by applying pressure to the direction 1ii44 perpendicular to the axial direction, and then melting the core material. It is something.

However, in this type of honeycomb structure, the pressure applied when adhering the core wires is likely to be concentrated on the outer peripheral portion, so that the core wires in the said portions are likely to shift, and the transmission holes are likely to be misaligned.

As a result, even if uniform gamma rays are incident on the structure, the detection outputs of the gamma ray detectors installed opposite to the gamma rays will be positionally non-uniform. As described above, the conventional honeycomb structure has the disadvantage that the radiation detection output tends to be uneven due to the deviation of the transmission holes.

Conventional honeycomb structures also require a die to draw the core wire and deposit the lead alloy.

Since these dies are relatively expensive, there is a problem in that the unit price of the product increases when producing in small quantities.

(c) Purpose This invention aims to provide a honeycomb structure in which pitch deviation of transmission holes is difficult to occur (and is suitable for relatively small quantity production).

B) Structure The honeycomb structure according to the present invention has a plurality of shielding plates formed by etching a plurality of transparent holes and made of a material that easily absorbs radiation, which are stacked so that the transparent holes of each shielding plate are in communication with each other. It is characterized by being stuck together.

(B) Embodiment Disaster Prevention Block FIG. 1 is a partially cutaway perspective view showing a first embodiment of the honeycomb structure according to the present invention.

In the figure, 10 is a honeycomb structure for a parallel hole type collimator according to this embodiment.

11 is 0.1-0. ．． A shielding plate having a thickness of 5+n+n and made of a lead alloy that absorbs radiation such as γ-rays well. For example, hexagonal transmission holes 12 are formed in the shielding plate 11 by etching with the same diameter and the same pinch. The semicircular spark 13 formed on the outer periphery of the shielding plate 11 is
It is used for positioning each shielding plate 11 as described later.

The honeycomb structure IO is formed by overlapping and fixing a predetermined number of shielding plates 11 so that the respective transmission holes 12 are vertically aligned in an orderly manner.

Next, a method for molding the honeycomb structure 10 shown in FIG. 1 will be explained in detail based on FIG. 2.

Reference numeral 20 denotes an assembly jig having four pins 21 erected around its periphery. Note that one of the pins 21 is 'yj! L
In order to prevent incorrect insertion of the drawing board 11, etc., the pins are slightly biased relative to the opposing pins.

30.30'' is a cover made of a stainless steel plate or the like. This cover 30.301 is formed in the same shape as the shielding plate 11. The cover 30° is fitted into the pin 21 of the assembly jig 2O.Next, , a predetermined number of shielding plates 11,
Furthermore, the covers 30 are fitted onto the pins 21 from above.

40 is a cylindrical body 4 having an inner diameter slightly larger than that of the shielding plate 11.
This is a holder in which a flange 42 is provided around the periphery of the holder 1. The inner surface of the cylindrical body 41 has a semicircular groove 4 in contact with the pin 21.
3 has been deleted. The boulder 40 is fitted into the pin 21 of the assembly jig 2O to hold the shielding plate 11. Therefore, the cylinder 41 includes the shielding plate 11 and the cover 30.31.
“It is formed to a height approximately equal to that of a stack of “.

50 is a presser plate that is attached from above the cover 30. The holding plate 50 has a gas hole 51 corresponding to the transmission hole 12 of the shielding plate 11 and an insertion hole 5 into which the pin 21 is inserted.
2 have been established.

A mold release agent is applied to the assembly jig 20, cover 30.3O'' holder 40, and presser plate 50.

Although not shown schematically in FIG.
2 etc. are formed entirely within the chain line area of each part.

FIG. 3 is a sectional view showing a state in which the shielding plate 11 is assembled into the assembly jig 20.

Therefore, the assembly jig 20 in which the shielding plate 11 etc. are incorporated
is placed in a vacuum chamber (not shown). Then, while pressing the pressing plate 50 more and more each time it is attached to the assembly jig 20, the stacked shields J) Mll are vacuum impregnated with a highly adhesive epoxy varnish or the like.

After vacuum impregnation, excess varnish in the transparent holes 12 of the shielding plate 11 is removed by blowing air, etc.
Each shielding plate 11 is bonded by heat curing.

After curing, press plate 50, boulder 40, cover 30.30
', pin 21 is removed. It is desirable to apply adhesive to the end surface of the notch 13 of the shielding plate 11 from which the pin 21 has been removed.

The shielding plates 11 may be bonded to each other by metallurgical bonding using heat and pressure.

In addition, if the dimensions of the partition walls between the through holes 12 are small and there is a risk that the through holes may deform when pressurized, a hollow or solid aluminum wire may be attached to an assembly jig or the like so as to be inscribed in the through holes. After impregnation and curing of the varnish and varnish, it is also possible to dissolve it.

Furthermore, without removing the pin 21 from the shielding plate 11,
This may be cut from the root and left attached to the shielding plate 11.

Further, when there is a density difference in the incident radiation, a honeycomb structure may be considered in which the opening area of the transmission hole or the arrangement pinch is set appropriately in accordance with the density difference. In other words, by making the ratio of the opening area of the transmission hole in the region where low-density radiation enters larger than in other parts, the difference in density of the incident radiation can be corrected, making it possible to detect radiation with extremely high accuracy. .

In addition, in the above description of the embodiment, the transmission hole has been explained as being hexagonal, but it goes without saying that this may be of other shapes such as a triangle or a quadrangle.

(F) Effect The honeycomb structure according to the present invention has a plurality of shielding plates made of a material that easily absorbs radiation, each of which has a plurality of transparent holes opened by etching, so that the transparent holes of each shielding plate communicate with each other. Since they are tied together and fixed, it is possible to prevent the pitching of the permeation holes that would occur due to pressure applied during fixation.

In addition, this invention does not require relatively expensive equipment such as dies for depositing lead alloy on the core wire, unlike conventional Hanekatsu and +111 constructions, so it is suitable for small room production. It is something that

[Brief explanation of the drawing]

FIG. 1 is a partially broken W1 perspective view showing a first embodiment of the honeycomb structure according to the present invention, and FIGS. 2 and 3 show a method for manufacturing the honeycomb 4111 structure shown in FIG. 1. It is an explanatory diagram. 1O1...Honeycomb structure, 11,...1 shielding,
20... Assembly jig, 30... Cover, 4O... Boulder, 50... Holding plate. Patent applicant Shimajiru Seisakusho Co., Ltd. Agent Patent attorney Takaharu Ohnishi

Claims (3)

[Claims] (1) A honeycomb characterized by having a plurality of shielding plates formed by etching a plurality of transparent holes and made of a material that easily absorbs radiation, which are stacked and fixed together so that the transparent holes of each shielding plate communicate with each other. Structure. (2) The plurality of shielding plates have transmission holes of the same size formed with the same pinch.1. The honeycomb structure according to claim 1, wherein the honeycomb structure is stacked two-dimensionally. (3) The plurality of shielding plates are arranged so that uniform detection output can be obtained when radiation having different density is incident on the plurality of shielding plates.
2. The honeycomb structure according to claim 1, wherein transmission holes are formed with different diameters and pitches depending on the density difference.