JPS63225200A - Fluorescent film for X-ray photography - 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] [Industrial Application Field] The present invention provides a method for amplifying X-rays incident on an X-ray sensitive film. An X-ray intensifying plate used or a fluorescent film for X&ll imaging such as an X-ray image conversion plate itself used as an X-ray film, more specifically between a support film and a transparent window film. niX
The present invention relates to a fluorescent film for X-ray photography, which is provided with a layer of fluorescent material that reacts when exposed to radiation.

[Conventional technology]

As shown in FIG. 4, a conventional fluorescent film for X-ray photography of this type has a large number of fluorescent material layers C, which react when exposed to X-rays, between a support film a and a transparent window film b. A paste consisting of fine particulate phosphor d... is interposed therebetween. In the case of the above-mentioned X & 91 intensifying plate, a normal fluorescent substance that emits light when exposed to X-rays is used as the fine particulate phosphor d...; In the case of an image conversion plate, the fine particulate phosphor d... does not emit light when exposed to X-rays but is sensitive to light, and is exposed to a predetermined excitation light (for example, a helium neon red laser) during subsequent reading. A so-called volatile fluorescent substance is used which has a special property of emitting light from the photosensitive area when irradiated with the film (e.g.). d, a large number of fine particulate fluorophores that react when exposed to X-rays.
The structure itself is common in that a fluorescent substance layer C made of a paste of... is interposed therebetween.

[Problem that the invention seeks to solve]

However, in the conventional X-ray imaging fluorescent film described above, the fluorescent substance layer C that reacts upon receiving X-rays is composed of a paste consisting of a large number of fine particulate fluorescent substances d... Basically, the fluorescent light emitted by each fine particulate fluorophore d upon receiving X-rays (or excitation light) is diffusely reflected due to the presence of other fine particulate fluorophores d... In particular, when the thickness of the phosphor layer made of fine particulate phosphor d is increased to increase sensitivity, the degree of phosphor scattering is extremely high. There was a problem in that the size of the image became large and the image became significantly blurred (resolution deteriorated).

Therefore, in order to increase sensitivity while preventing such deterioration of resolution as much as possible, one fluorophore film for X-ray photography should be made thin so as not to cause problems in terms of resolution, and instead, the above-mentioned X-ray When used as a line sensitizing plate,
A fluorescent film for X and %I photography may be placed on both the front and back of a radiation-sensitive film, or when used as the X-ray image conversion plate, a large number of fluorescent films for XwA photography may be placed on top of one another at the same time. It was necessary to carry out cumbersome imaging work using a plurality of X&I imaging fluorescers, such as exposing the X-rays to light and adding the exposure results of each X-ray imaging fluorescer film during reading.

The present invention has been made in view of such conventional circumstances, and its purpose is to ensure sufficient resolution even if the fluorescent material layer is configured relatively thick so that a single layer has sufficient sensitivity. The objective is to develop and provide a fluorescent film for X-ray photography.

c. Means for Solving the Problem] In order to achieve the above object, the fluorescent film for X-ray photography according to the present invention has a supporting film as shown in the basic configuration diagram (diagram corresponding to claims) in FIG. The fluorescent substance layer C interposed between A and the transparent window film B is composed of a plurality of phosphor layers each having a height substantially extending from the inner surface of the support film A to the inner surface of the transparent window film B. Columnar transparent phosphor 1...
Things that are next to each other 1. It is characterized in that it is arranged in such a way that a predetermined gap 2 is formed between the two.

[Effect]

The effects achieved due to this characteristic configuration are as follows.

That is, in the fluorescent film for X-ray photography according to the present invention,
As schematically shown in FIG. 1, the fluorescent material layer C
However, since it has a single layer structure consisting of a large number of columnar transparent phosphors l... arranged with gaps 2..., X-rays (
The fluorescent light emitted by each columnar transparent phosphor 1 upon receiving the excitation light wA) is almost totally reflected at the interface between the circumferential surface of the columnar transparent phosphor 1 and the gap. Most of the light is emitted outward from the end face on the side of the transparent window film B, and therefore, in the case of a conventional structure having a phosphor layer made of a paste consisting of a large number of fine particulate phosphors, The scattering phenomenon of fluorescent light, which was easy to occur, almost never occurs in principle. Therefore, even if the fluorescent material layer C is made thicker (that is, the height of the columnar transparent fluorescent material L is increased), Due to the above-mentioned principle, the fluorescent light emitted by the columnar transparent phosphor 1 hardly diverges, and therefore the resolution determined by the cross-sectional area of the columnar transparent phosphor 1 hardly deteriorates further.

Thus, by making the fluorescent material layer C sufficiently thick,
This X-ray imaging fluorescent film can be configured to have sufficient sensitivity with just one piece, while still maintaining high resolution.

〔Example〕

Specific embodiments of the present invention are shown below in the drawings (Figures 2 and 3).
The explanation will be based on Figure).

FIG. 2 shows the first embodiment, and as shown, the support is made of a material that is transparent to X-rays and hard to scatter X-rays, such as aluminum foil or acrylic film (which may be transparent or opaque). On one side (the top side in this figure) of the film A, there are many columnar transparent phosphors 1 that react when exposed to X-rays.
. . . are adhered to each other via an adhesive 3 such that a predetermined gap 2 . At the same time, the upper surface side of the fluorescent material layer C is covered with a transparent window film B (eg, polyester film, etc.) to constitute a fluorescent film for X-ray photography. In other words, this X! The phosphor film for shadow use includes a large number of columnar transparent phosphors 1 whose height is substantially equal to the distance between the support film A and the transparent window film B (excluding the thickness of the adhesive 3). The fluorescent material layer C is formed by arranging the fluorescent material layers C in a spaced manner from each other.

In addition, in the specific manufacture of this fluorescent film for X-ray photography, it is possible to individually attach the large number of columnar transparent phosphors 1 to the surface of the support film A. A simpler method is to use a screen printing method using a transparent fluorescent material, or to adhere a film made of a transparent fluorescent material onto the surface of the support film A and then use a dicing method to close the gap 2. As a result, a large number of columnar transparent phosphors l... may be arranged spaced apart from each other.

Further, the cross-sectional shape of each of the columnar transparent phosphors 1 can be formed into any arbitrary shape (for example, a square, a circle, a hexagon, etc.).

FIG. 3 shows a second embodiment as a further improvement. In this case, the columnar transparent phosphors 1.1...
By filling the gap 2 formed between them with, for example, a white opaque powder or paste reflective material or light-shielding material, scattering of the fluorescent light from the individual columnar transparent phosphors can be further reduced. This is to ensure that this can be prevented. Although the other configurations are similar to those of the above embodiment, members having the same functions are designated by the same reference numerals, and their explanations will be omitted.

By the way, when using the fluorescent film for X-ray photography according to each of the above-mentioned Examples as the above-mentioned X-ray intensifying plate,
The columnar transparent phosphor 1 may be composed of an ordinary fluorescent substance that emits light when exposed to XvA, and when used as an X-ray image conversion plate, the columnar transparent fluorophore 1... When the body 1... receives X-rays, it does not emit light but is photosensitive, and when it is irradiated with a predetermined excitation light wA (for example, a helium neon red laser) during subsequent reading, the photosensitive portion emits light. Needless to say, it may be made of a volatile transparent fluorescent substance.

〔Effect of the invention〕

As is clear from the detailed description above, according to the fluorescent film for X-ray photography according to the present invention, the fluorescent substance layer interposed between the support film and the transparent window film is It adopts a structure in which a large number of columnar transparent phosphors whose height extends from the inner surface of the film to the inner surface of the transparent window film are arranged so that a predetermined gap is formed between adjacent ones. Therefore, the fluorescent light emitted by each columnar transparent phosphor upon receiving X-rays (or excitation light) is hardly scattered, and most of the fluorescent light is transmitted to the end face of the columnar transparent phosphor on the side of the transparent window film. It can be made to emit outward from the
Therefore, by making the fluorescent substance layer sufficiently thick (in other words, increasing the height of the columnar transparent phosphor), it is possible to configure this X-ray photography fluorophore film to have sufficient sensitivity with just one piece. It is now possible to maintain high resolution,
Therefore, the preparation and work for photographing can be greatly simplified, and the amount of radiation exposure of the person being photographed can be reduced by increasing the sensitivity.Furthermore, resolution control and image quantization can be Various excellent effects have been achieved that can be easily achieved by adjusting the hard level of setting the cross-sectional area of the transparent phosphor.

[Brief explanation of drawings]

FIG. 1 shows a partially enlarged longitudinal sectional view (a view corresponding to the claims) for explaining the basic structure and operation of the fluorescent film for X-ray photography according to the present invention. Further, FIGS. 2 and 3 are for explaining the present invention in detail, and FIG. 2 shows a partial longitudinal cross-sectional view of the fluorescent film for X-ray photography according to the first embodiment, FIG. 3 shows a partial longitudinal sectional view of a fluorescent film for X-ray photography according to a second embodiment. FIG. 4 is for explaining the technical background of the present invention and the problems of the prior art, and shows a partially enlarged vertical sectional view of the conventional configuration. l......Columnar transparent phosphor, 2...
...Gap 2, A... Support film, B... Transparent window film, C...
...Fluorescent material layer, D...Reflective material or light-shielding material. Applicant Horiba Ltd. Representative Patent Attorney Hide Fujimoto Figure 1 Figure 2

Claims (1)

[Scope of Claims] [1] A fluorescent film for X-ray photography, in which a fluorescent substance layer that reacts upon receiving X-rays is interposed between a support film and a transparent window film, the fluorescent film comprising: The material layer is composed of a plurality of columnar transparent phosphors, each having a height substantially extending from the inner surface of the support film to the inner surface of the transparent window film, with a predetermined gap between adjacent ones. A fluorescent film for X-ray photography, characterized in that it is arranged in a state where it is formed. [2] The X-ray according to claim [1], wherein a reflective material or a light-shielding material is embedded in a gap formed between adjacent columnar transparent phosphors. Fluorescent film for photography.