JPH1010235A - Device for detecting multi-element radiation and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive, highly precise and high performance detec tor for X-ray CT (Computer Tomography). SOLUTION: A plurality of detection elements comprising scintillator elements 102 emitting fluorescence by making radiation incident and a photoelectric conversion element 106 for detecting fluorescence are arranged in a first direction to dispose a partition plate 104 between the scintillator elements. In this case, a substrate in which the photoelectric conversion element 106 is formed to be separated from an insensitive band has a groove 190 in which the partition plate 104 is inserted in the center part of the insensitive band. The substrate is larger than the second directional length orthogonal to the first direction of the scintillator elements 102, the edge of the partition plate 104 is inserted in the inside of the groove 190 to expose both the ends of the partition plate 104 in the outside in the second direction of the scintillator element 102. Therefore optical leakage can be extremely lessened between adjacent channels by a simple manufacturing process.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation detector, and more particularly to a whole-body X-ray computed tomography apparatus (hereinafter referred to as an X-ray CT).
X-ray detector).

2. Description of the Related Art Conventional X-ray CT X-ray detectors include, for example,
As described in Japanese Patent Publication No. 60-58429, an ionization chamber X-ray detector utilizing the ionizing action of a rare gas has been widely used, but a phosphor has been used for high resolution, miniaturization and cost reduction. Solid state detectors are being developed. As an example of such a solid state detector, JP-A-60-263456,
JP-A-59-81575, JP-A-59-141087
And U.S. Pat. No. 4,429,227.
A typical configuration of a solid state detector is disclosed in Japanese Patent Laid-Open No. 60-26345.
Explanation will be made based on the contents described in No. 6. The solid-state detector includes a light emitting portion by incident X-rays and a photoelectric conversion portion for receiving and detecting the light emission. FIG. 3 shows the structure of the light emitting portion. The scintillator element 141 is formed by dividing the light reflector with a partition plate 140 made of a heavy metal thin plate having a large X-ray absorption rate.
Through this, a multi-channel scintillator element body 145 bonded sequentially is manufactured. Various types of photoelectric conversion elements are used for the light receiving portion, and multi-channel photoelectric conversion elements are frequently used in order to correspond to a multi-channel scintillator element as shown in FIG. As a photoelectric conversion element, a PIN or PN type silicon photodiode is often used. FIG. 4 shows a configuration of a multi-channel photoelectric conversion element. On one semiconductor substrate 110, a plurality of photoelectric conversion elements 116 as photodetectors are formed, and the semiconductor substrate 110 is integrated with an insulating substrate 109. The solid state detector is manufactured by adhesively bonding the multi-channel type scintillator element body 145 shown in FIG. 3 to the multi-channel type photoelectric conversion element shown in FIG. 4 using an optically transparent adhesive so that each channel coincides. Is done.
As shown in FIG.
The dimensional accuracy of the multi-channel scintillator element body 145, particularly the pitch accuracy of the scintillator element and the accuracy of the width dimension of the above-mentioned element body are important, and the inconsistency of the channels causes variation in the detection sensitivity of each channel. An artifact (false image) is given to the X-ray CT image.
The adhesive bonding surface of the multi-channel scintillator element body 145 with the multi-channel photoelectric conversion element must be flat. The unevenness of the fluorescent output surface of the above-mentioned element body, the unevenness in the height direction of the scintillator when the partition is cut, and the unevenness of the light receiving surface of the photoelectric conversion element cause light leakage between channels, which also causes an artifact in the X-ray CT image. give. The production of the multi-channel scintillator element body 145 as shown in FIG. 3 requires a complicated process requiring high precision. FIG. 5 shows an outline of an improved method for manufacturing a multi-channel scintillator element body 145 described in Japanese Patent Application Laid-Open No. 59-81575. Scintillator thin plate 1 having predetermined dimensions
41 and the partition plate 140 are bonded and integrated by a predetermined number alternately with an adhesive, and after the adhesive is solidified, a diamond cutter,
Alternatively, this is a method of efficiently manufacturing a multi-channel type scintillator element body 145 using a multi-wire saw.
As described above, since the element body 145 is required to have high accuracy, a large number of the scintillator thin plates 141 and the partition plate 1 are required.
In connection with the bonding of 40, the thickness of the bonding layer on each bonding surface needs to be uniformly and accurately performed. In the above-described prior art example, the scintillator 141 and the partition plate 140 have the same height, and have low directivity for incident X-rays.
This type of detector has a large amount of scattered radiation incident. The prior art examples shown in FIGS. 6 and 7 are detectors of the type in which the amount of incident scattered radiation is reduced. FIG. 6 shows a U.S. Pat.
No. 27, a thin plate 150 made of tungsten or a high-density material that also serves as a collimator plate for reducing the amount of scattered radiation incident and a partition plate for preventing light leakage between adjacent channels is used as the scintillator 151. And maintain a constant positional relationship. The scintillator 151
It faces the light receiving surface 155 of the photodiode 153 on the substrate 154 via the optical grease 152. In this example, the thin plate 150 requires a complicated shape, and there is light leakage between adjacent channels via a gap between the thin plate 150 and the light receiving surface 155. FIG.
This is a prior art example described in No. 7, in which a cadmium tungstate crystal 162 is used as a scintillator material, and a partition plate between scintillator elements is omitted because of its large X-ray absorption. A light reflection layer 161 is formed on the surface of the scintillator 162 to prevent light from leaking to an adjacent channel. Collimator member 1
The jig 60 is used so as to be located at the joint of the scintillator member. The scintillator element faces the light receiving element 163 on the substrate 164 via the optical coupler. This example has the advantage that the manufacture of the collimator part and the manufacture of the X-ray detection element part are independent. However, as in the example shown in FIG. 6, the scintillators are processed one by one with the required accuracy and the surface of the scintillator is processed as necessary. Optical processing must be performed, and a number of steps are required. □

In the above prior art, the fluorescent output surface of the multi-channel scintillator element, which is one of the causes of light leakage between adjacent channels, and the light reception of the multi-channel photoelectric conversion element. Regarding the surface irregularities, no consideration has been given to the manufacture of the X-ray detector, and there has been a problem that there is a limit in reducing the light leakage.
Further, the above-mentioned prior art requires a complicated manufacturing process and has a problem in manufacturing cost and yield of a multi-channel scintillator element having high accuracy. It is an object of the present invention to provide an inexpensive and high-performance X-ray CT detector that can extremely reduce light leakage between adjacent channels with high accuracy by a simple manufacturing process.

The object of the present invention is to provide a multi-channel type of scintillator thin plate having a predetermined thickness adhered to the light receiving surface of a multi-channel type photoelectric conversion element with an optically transparent adhesive. A groove for inserting a partition plate at a center position of a dead zone separating each channel on the photoelectric conversion element is provided inside the semiconductor substrate forming the multi-channel type photoelectric conversion element from the surface of the scintillator, or the semiconductor substrate or the thin-film photoelectric conversion element is formed. The problem can be solved by forming the substrate up to the inside of the electrically insulating substrate to be supported or mounted, and inserting and fixing a partition plate into this groove.

The partition plate is inserted up to the bottom of the groove formed up to the scintillator portion, the inside of the semiconductor substrate forming the photoelectric conversion element, or the inside of the electrically insulating substrate supporting or mounting the semiconductor substrate or the thin-film photoelectric conversion element. So that
Light leakage between adjacent channels can be extremely reduced without being affected by the unevenness of the fluorescent light output surface of the multi-channel type scintillator element body and the light receiving surface of the multi-channel type photoelectric conversion element.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. Each scintillator 102 faces the light receiving surface of the multi-channel type photoelectric conversion element via an optically transparent adhesive layer 105. The photoelectric conversion element shown in FIG.
1 shows an IN type silicon photodiode. It comprises a P + layer 106, an I layer 107 and an N + layer 108 and is on an electrically insulating substrate 109. The light receiving surface corresponds to a portion of the semiconductor substrate surface where the P + layer 106 is formed in an elongated island shape. X-ray incident side 10 of scintillator 102
The light reflecting layer 103 is formed on the surface 103 and two side surfaces in the longitudinal direction of the scintillator element, that is, on both side surfaces having a small area among the surfaces orthogonal to the X-ray incident surface 103. The outermost layer has an optically transparent thin electrically insulating layer to prevent light leakage between adjacent channels and to improve the light collection efficiency of the fluorescent light generated inside the scintillator to the photoelectric conversion element. A groove for inserting a partition plate 104 having a thickness of 0.1 to 0.2 mm, which is made of molybdenum, tantalum, tungsten, lead or an alloy containing these elements as a main component, is located between adjacent light receiving surfaces 106. It is located at the center of the dead zone, is formed by means such as a diamond cutter, passes through the scintillator 102, the adhesive layer 105, and
It reaches a part of the layer 107. Such a structure can be manufactured by the method described below. FIG. 8 shows a powder phosphor, for example, ZnS: Ag, Ba ₂ GdSbO ₄ ,
Ba ₂ BiInO ₆ , Ba ₂ BiYO ₆ , GdPb ₂ WO ₆ ,
La ₂ O ₂ S: Tb, ZnCdS: Ag, LaOBr: D
y, CdS, etc., a phosphor sphere manufactured by hot isostatic pressing or the like, or a single crystal such as Zn ₂ SiO ₄ , C
_{aWO 4, CdWO 4, ZnWO 4} , CsI: Na, Cs
I: Tl, NaI: Tl, Gd ₂ SiO ₄ : Ce, Bi ₄
Ge ₃ O ₁₂ , CaF ₂ : manufactured by cutting out from Eu or the like,
5 shows a phosphor block 200 having dimensions L, W, H.
The two surfaces 203 defined by W × H finally become surfaces corresponding to the longitudinal direction of the scintillator element.
A light reflecting layer containing barium sulfate, titanium dioxide, or the like is applied to the surface of No. 03, or an aluminum vapor deposition layer or the like is formed. The dimension L may be equal to the length of the scintillator element, and the dimension W may be slightly larger than the width in the channel direction of the multi-channel photoelectric conversion element. The dimension H may be a dimension such that an appropriate number of scintillator thin plates 102 having a predetermined thickness t as shown in FIG. 9 can be obtained. FIG. 9 shows a scintillator thin plate 102 having a thickness t cut out from the phosphor block 200 shown in FIG. 8, and a light reflecting layer is formed on one of the surfaces having the maximum area in the same manner as the surface 203. Is done. The surface of the scintillator thin plate 102 having the largest area without the light reflection layer is connected to the multi-channel photoelectric conversion element 110.
Is fixed to the surface with a light-transmitting adhesive. FIG. 10 shows the completed bonding state obtained in this way, and FIG. 11 shows its cross section. The presence of the adhesive layer 105 is 30 to 40% as compared with the case where the light detection unit and the light emitting unit are opposed to each other via an air layer.
The advantage is that the output can be improved. As shown in FIG. 10, the length of the multi-channel type photoelectric conversion element is longer than the element length L, and the light receiving surface 106 of the adjacent photoelectric conversion element.
The position of the dead zone between them can be observed at both ends in the longitudinal direction of the element without being interrupted by the scintillator thin plate. FIG. 12 shows a groove 190 formed at the center position of the dead zone. The depth of the groove 190 is set to prevent mixing of electric noise and maintain mechanical strength of the semiconductor substrate forming the photoelectric conversion element. Are stopped in the middle of the I layer 107 and do not reach the N + layer 108. The width of the groove 190 is smaller than the width of the dead zone, and
It is sufficient that the width is slightly larger than the thickness of, for example, 10 to 20 microns, and in order to increase the area of the scintillator 102, the means for imparting light reflectivity to the surface of the partition plate is more than the means for applying light-reflective paint. Rather, it is more desirable to form a thin aluminum layer by vapor deposition or the like. Such a partition plate 104 is inserted to the bottom of the groove 190. The height of the partition plate 104 is at least the same as that of the light reflection layer 103 in FIG. 1 or slightly convex.
The length of the partition plate 104 is longer than the length of the scintillator element 102, as shown in FIG. 14, to prevent light leakage between adjacent channels at both ends in the element longitudinal direction. The inserted partition plate 104 is firmly adhered and fixed to the surface of the substrate 109 on which the multi-channel photoelectric conversion element 110 is mounted together with the entire side surface of the scintillator element 103 with an adhesive 120 at both ends in the element longitudinal direction. The advantages of using a partition plate longer than the length of the scintillator element as described above will be described in further detail below. If a partition plate having the same length as the scintillator element is used, as shown in FIG. 16, the partition plate 203 is drawn into the scintillator element 205 at one end due to a slight error in their arrangement. That is, a portion (distance d) where the partition plate 203 is not interposed is formed near the end, and the fluorescence 302 leaks between the adjacent scintillator elements 205, resulting in crosstalk. In FIG. 16, 201 indicates an incident X-ray, and 301 indicates an X-ray collimator. The amount of crosstalk is determined by the distance d, the X-ray absorption coefficient and light absorption coefficient of the scintillator element 205, the X-ray energy spectrum, the collimator aperture t, and the shape and size of the scintillator element 205. FIG. 17 shows an example of the relationship between the distance d and the amount of crosstalk. In this way, light crosstalk occurs between the scintillator elements, and between the elements,
If there is a difference in the amount of crosstalk, this causes ring-shaped artifacts and radial artifacts. The limit crosstalk amount at which artifacts do not occur varies depending on the shooting conditions, but must be suppressed to 0.05% or less under severe conditions. In the example of FIG. 17, in order to suppress the crosstalk amount to 0.05% or less, the deviation amount d needs to be about 20 μm or less. Depending on the characteristics and shape of the scintillator element, the restriction on the deviation d becomes more severe. With the conventional method shown in FIG. 3, it is not easy to secure such accuracy with a good yield. Therefore,
By making the length of the partition plate (the length in the slice thickness direction of the tomographic image) longer than the length of the scintillator element as in the embodiment of FIG. 14, dimensional errors and arrangement errors are absorbed, and the end of the partition plate becomes It can be prevented from entering inside the scintillator end. As a result, it is possible to prevent the occurrence of crosstalk which causes an artifact. According to the embodiment of FIG. 14, since the corresponding positional accuracy of the scintillator element 102 and the light receiving surface 106 is determined only by the mechanical accuracy of the processing machine for forming the groove 190, a high-performance multi-channel detecting element is required. The multi-channel scintillator element body shown in FIG.
It can be manufactured without being manufactured independently. FIG.
By using the arrangement jig 121 of the scintillator element and the partition plate as shown in (1), the position of the partition plate in the slice thickness direction can be accurately limited. Another embodiment is shown in FIG.
This will be described below. Similar to the first embodiment, the material of the partition plate 104 is such that light is reflected on a surface having a thickness of 0.1 to 0.2 mm made of molybdenum, tantalum, tungsten, lead, or an alloy containing these elements as a main component. The partition plate 104 is inserted from the surface of the scintillator element 102 to the bottom of the groove 190,
The projection is convex in the X-ray incident direction by at least five times the dimension of the width 2. Therefore, the difference from the embodiment of FIG.
This is a point that the amount of scattered X-rays is reduced by making the collimator 04 function as a collimator. The amount of scattered X-rays can be reduced and light leakage between adjacent channels can be minimized. In this case, since the height of the partition plate in the X-ray incident direction becomes large, it is necessary to hold the partition plate 104 sufficiently firmly. FIG. 15 shows an example of this holding method. Support 1 having groove 131
30 is integrated and fixed after the position is determined so that the pitch between the substrate 109 and the groove is accurately opposed by the jig.
After the partition plate 104 is inserted to the bottom of the groove formed up to the inside of the photoelectric conversion element 110 through the groove 131, the groove 1
31 are firmly adhered and fixed. The formation of the groove 131 is accurately performed by the same processing means as the formation of the groove 190 in FIG. As an example suitable as a scintillator material in the above two embodiments, it is one of the phosphors having a high conversion efficiency and a short afterglow time described in Japanese Patent Publication No. 60-4856 (Gd _1-xy). Pr _x Ce _y ) ₂ O ₂ S: F. This phosphor can be easily synthesized in powder form, and as described in JP-A-62-52481, this powder phosphor can be molded by a hot isostatic pressing method and has a thickness of 1 to 5.
1.5 mm has sufficient X-ray absorption and light transmittance, and a high-sensitivity and high-performance X-ray detector can be manufactured by the above two embodiments. When the X-ray absorptance of the scintillator material is not sufficiently large, a material having a high light transmittance and a high X-ray absorptivity is bonded to the surface of the scintillator thin plate having the maximum area having no light reflectivity as shown in FIG. Thus, the first and second embodiments can be applied as a modification. As a modification of the first embodiment, there is the following. In FIG. 9, a surface 203 having a light reflection layer,
The object of the present invention can be achieved without forming a light reflecting layer on the surface of the substrate 103. This is shown in FIG.
By using a black light-blocking adhesive, in other words, a non-light-transmitting adhesive, light leakage to adjacent channels at both ends in the longitudinal direction of the scintillator element can be minimized. This is because light leakage on the X-ray incidence surface can be prevented by adopting the structure of FIG. 3 of No. 57-156748. Next, the depth of the groove into which the partition plate 104 is inserted is deeper than the depth of the P layer of the photoelectric conversion element.
Although the case where the thickness of the light guide substrate on which the photoelectric conversion element is formed is set to 1/2 or less has been described, a third embodiment in which the depth of the groove reaches the inside of the substrate 109 is shown in FIG. . In this case, since the multi-channel type photoelectric conversion element is divided by the groove for each element at the dead zone position, the semiconductor substrate forming the photoelectric conversion element and the substrate 1 are separated.
09 is required to be adhered so as to make firm contact. On the other hand, if the multi-channel type photoelectric conversion element is formed in a thin film directly on the electrically insulating substrate 109, the above requirement becomes almost unnecessary. A method of forming a photoelectric conversion element in a thin film from amorphous silicon is well known.
It goes without saying that the third embodiment can be applied to the first and second embodiments and their modifications.
Although the first, second, and third embodiments and their modifications have been described, light leakage between adjacent channels can be extremely reduced by a simple manufacturing process by any of these methods. In the above description of the embodiment, the signal extraction path means are omitted because they are well known in many conventional examples. For multi-element photoelectric conversion elements,
Although the description is limited to the PIN type silicon photodiode, it is needless to say that the present invention is applicable to various types of photoelectric conversion elements.

As described above, according to the present invention, light leakage between adjacent channels can be extremely reduced, the manufacturing process is simple, and the performance of the multi-channel detecting element is improved only by the mechanical accuracy of the processing machine. As a result, a high-sensitivity, high-performance multi-channel detector can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention at a central position in an element longitudinal direction.

FIG. 2 is a cross-sectional view at a central position in a device length direction according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional example of a multi-channel scintillator element body.

FIG. 4 is a perspective view showing a multi-channel photoelectric conversion element.

FIG. 5 is a perspective view showing a conventional example of a method for manufacturing a multi-channel scintillator element body.

FIG. 6 is a cross-sectional view of a conventional example having a collimator at a central position in an element longitudinal direction.

FIG. 7 is a cross-sectional view of a conventional example having a collimator at a center position in an element longitudinal direction.

FIG. 8 is a view showing a phosphor block according to the embodiment of the present invention.

FIG. 9 is a view showing a scintillator thin plate according to the embodiment of the present invention.

FIG. 10 is a diagram showing a state in which a scintillator thin plate is bonded and fixed to a surface of a multi-channel type photoelectric conversion element with a light-transmitting adhesive in an embodiment of the present invention.

FIG. 11 is a cross-sectional view in a direction perpendicular to the device longitudinal direction, showing a state in which a scintillator thin plate is adhered and fixed to a surface of a multi-channel type photoelectric conversion device with a light-transmitting adhesive in an embodiment of the present invention.

FIG. 12 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the element, showing a groove formed at the center position of a dead zone in the embodiment of the present invention.

FIG. 13 is a cross-sectional view in a direction perpendicular to the element longitudinal direction showing a state where the depth of a groove reaches the inside of a substrate in a third embodiment of the present invention.

FIG. 14 is a cross-sectional view in a direction parallel to the device longitudinal direction, for describing prevention of light leakage between adjacent channels at both ends in the device longitudinal direction in the embodiment of the present invention.

FIG. 15 is a cross-sectional view in a direction parallel to the longitudinal direction of the element for explaining a partition plate that reduces the amount of scattered X-rays and minimizes light leakage between adjacent channels in the embodiment of the present invention.

FIG. 16 is a view for explaining a case where a partition plate having the same length as a scintillator element is used. Sectional view in a direction parallel to the direction.

FIG. 17 is a diagram illustrating an example of a relationship between a portion (distance d) where a partition plate does not intervene near an end portion and a crosstalk amount.

FIG. 18 is a view showing an arrangement jig for arranging a scintillator element and a partition plate according to the embodiment of the present invention.

[Explanation of symbols]

101: X-ray incident side, 102: Scintillator, 103 ...
Light reflecting layer, 104: partition plate, 105: adhesive layer, 106 ...
Light receiving surface, 107: I layer, 108: N + layer, 109: insulating substrate, 110: photoelectric conversion element, 116: photoelectric conversion element, 120: adhesive, 121: arrangement jig, 130: support, 131: groove , 141... Scintillator elements 141, 1
40: partition plates 140, 145: multi-channel scintillator element body, 150: thin plate, 151: scintillator, 1
52: Optical grease, 153: Photodiode, 15
4, a substrate, 155, a light receiving surface, 160, a collimator member,
161, a light reflecting layer, 162, a scintillator, 163, a light receiving element, 164, a substrate, 190, a groove for inserting a partition plate, 200
... Fluorescent substance block 201 201 incident X-ray 203 partition plate 205 scintillator element 301 X-ray collimator 302 302 fluorescence.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumio Kawaguchi 1-280, Higashi-Koikekubo, Kokubunji-shi, Tokyo Inside the Central Research Laboratory of Hitachi, Ltd. (72) Tetsuhiko Takahashi 1-280, Higashi-Koikekubo, Kokubunji-shi, Tokyo Hitachi Central Research Laboratories (72) Inventor Takayuki Hayakawa 2-1 Juyo Kashiwa-shi, Chiba Pref.

Claims (22)

[Claims] 1. A plurality of detecting elements each comprising a scintillator element which emits fluorescence upon incidence of radiation and a photoelectric conversion element which detects the fluorescent light are arranged in a first direction, and a partition plate is arranged between the scintillator elements. In the multi-element radiation detector, the substrate on which the photoelectric conversion elements are formed separated by a dead zone has a groove in which the partition plate is inserted in a region of the dead zone, and the length of the partition plate is equal to the length of the scintillator. The length of the element is larger than the length in a second direction orthogonal to the first direction, and the tip of the partition plate is inserted into the inside of the groove, and the partition is provided outside the scintillator element in the second direction. A multi-element radiation detector characterized by exposing both ends of a plate. 2. A multi-element radiation in which a plurality of detection elements each including a scintillator element that emits fluorescence upon incidence of radiation and a PIN photodiode that detects the fluorescence are arranged, and a partition plate is arranged between the scintillator elements. In the detector, the substrate on which the PIN photodiode is formed separated by a dead zone has a groove in which the partition plate is inserted in a region of the dead zone, and the depth of the groove is の of the thickness of the substrate.
A multi-element radiation detector, wherein the partition plate is inserted into the groove. 3. A plurality of detecting elements, each of which includes a scintillator element that emits fluorescent light upon incidence of radiation and a PIN photodiode that detects the fluorescent light, are arranged in a first direction, and a partition plate is arranged between the scintillator elements. In the multi-element radiation detector described above, the substrate on which the PIN photodiode is formed with a dead zone has a groove in which the partition plate is inserted in a region of the dead zone, and the depth of the groove is equal to the thickness of the substrate. And the length of the partition plate is greater than the length of the scintillator element in a second direction orthogonal to the first direction, and the partition plate is inserted into the groove. A multi-element radiation detector, wherein both ends of the partition plate are exposed to the outside of the scintillator element in the second direction. 4. A plurality of detecting elements, each of which includes a scintillator element that emits fluorescence upon incidence of radiation and a photoelectric conversion element that detects the fluorescent light, are arranged in a first direction, and a partition plate is arranged between the scintillator elements. In the multi-element radiation detector, the scintillator element has a light reflection layer on a surface on which the radiation is incident, and the substrate on which the photoelectric conversion element is formed separated by a dead zone has a groove in which the partition plate is inserted. The length of the partition plate is greater than the length of the scintillator element in a second direction orthogonal to the first direction, and the tip of the partition plate extends to the inside of the groove. The partition plate is inserted to expose both ends of the partition plate to the outside in the second direction of the scintillator element, and the partition plate is moved forward by at least five times the width of the scintillator element in the first direction. Multi-element radiation detector, which is a convex than the planes of the light reflection layer. 5. A multi-element radiation in which a plurality of detection elements each comprising a scintillator element which emits fluorescence upon incidence of radiation and a PIN photodiode for detecting said fluorescence are arranged, and a partition plate is arranged between said scintillator elements. In the detector, the scintillator element has a light reflecting layer on a surface on which the radiation is incident, and the substrate on which the PIN photodiode is formed separated by a dead zone is provided with a groove in which the partition plate is inserted in an area of the dead zone. Wherein the depth of the groove is less than or equal to half the thickness of the substrate, the partition plate is inserted to the inside of the groove, and the partition plate has a width of the scintillator element in the first direction. A multi-element radiation detector which is convex from the surface of the light reflecting layer by 5 times or more of the above. 6. A plurality of detecting elements, each of which includes a scintillator element that emits fluorescence upon incidence of radiation and a PIN photodiode that detects the fluorescent light, are arranged in a first direction, and a partition plate is arranged between the scintillator elements. In the multi-element radiation detector described above, the scintillator element has a light reflection layer on a surface on which the radiation is incident, and the substrate on which the PIN photodiode is formed separated by a dead zone has a groove in which the partition plate is inserted. A second groove perpendicular to the first direction of the scintillator element, wherein the depth of the groove is not more than の of the thickness of the substrate, and the length of the partition plate is perpendicular to the first direction of the scintillator element. The length of the partition plate is inserted to the inside of the groove, and both ends of the partition plate are exposed to the outside of the scintillator element in the second direction.
The multi-element radiation detector according to claim 1, wherein the partition plate is convex from a surface of the light reflection layer by at least five times a width of the scintillator element in the first direction. 7. A multi-element radiation detector according to claim 4, wherein said light reflection layer is made of an aluminum vapor-deposited layer. 8. The multi-element radiation detector according to claim 5, wherein said light reflecting layer is made of an aluminum vapor-deposited layer. 9. A multi-element radiation detector according to claim 6, wherein said light reflection layer is made of an aluminum vapor-deposited layer. 10. A method according to claim 1, wherein the plurality of photoelectric conversion elements are separated by a dead zone.
The surface opposite to the surface on which the light reflection layer is formed of the scintillator thin plate having the light reflection layer formed on one surface is bonded to a substrate formed in a direction arranged in the direction by a light-transmitting adhesive. (1) having a length greater than a length of the scintillator thin plate in a second direction orthogonal to the first direction;
Forming a groove reaching the inside of the substrate in the area of the dead zone, and separating the scintillator thin plate by the groove.
And a step of exposing both ends of the partition plate to the outside of the scintillator thin plate in the second direction by exposing the partition plate having a length greater than the length of the scintillator thin plate in the second direction. And a third step of inserting the multi-element radiation detector into the inside of the groove. 11. A substrate on which a plurality of photoelectric conversion elements are formed separated by a dead zone, wherein the length of the substrate in a first direction formed by arranging the photoelectric conversion elements is equal to a light reflecting layer on one surface. The length of the dead zone in a second direction orthogonal to the first direction is smaller than the length of the scintillator thin plate on which the is formed in the first direction, and the length of the dead zone in the second direction is orthogonal to the first direction. The scintillator is formed such that a portion of the dead zone is exposed outside at least one end of the scintillator thin plate in the second direction on the substrate formed to be larger than the length of the scintillator thin plate. A first step of bonding a surface of the thin plate opposite to the surface on which the light reflection layer is formed with a light-transmitting adhesive, and exposing at least one end in the second direction to the outside. A second step of detecting the dead zone; A third step of forming a groove in the dead zone region having a length greater than a length of the scintillator thin plate in a second direction and reaching the inside of the substrate, and separating the scintillator thin plate by the groove; A partition having a length greater than a length of the scintillator thin plate in the second direction, exposing both ends of the partition to the outside in the second direction of the scintillator thin plate, And a fourth step of inserting the multi-element radiation detector into a multi-element radiation detector. 12. A method for manufacturing a multi-element radiation detector according to claim 11, wherein said first step comprises exposing said dead zone outside both ends of said scintillator thin plate in said second direction. Thus, the step of bonding the scintillator thin plate with the adhesive, the second step is a step of detecting the dead zone exposed outside both ends in the second direction, and the third step. Forming a groove in the center of the dead zone detected in the second step. 13. A scintillator thin plate having a light-reflecting layer formed on one surface of a substrate on which a plurality of PIN photodiodes are arranged in a first direction with a dead zone therebetween, and a surface on which the light-reflecting layer is formed. A first step of bonding the opposite surface with a light-transmitting adhesive, and a length greater than a length of the scintillator thin plate of the PIN photodiode in a second direction orthogonal to the first direction. Forming a groove in the dead zone region, separating the scintillator thin plate by the groove, and forming a partition plate having a length greater than a length of the scintillator thin plate in the second direction. A third step of exposing both ends of the partition plate to the outside of the scintillator thin plate in the second direction and inserting the partition plate into the groove. Manufacturing method . 14. A substrate on which a plurality of PIN photodiodes are formed with a dead zone therebetween, wherein the length of the substrate in a first direction in which the PIN photodiodes are arranged is equal to the length of a light reflecting layer on one surface. The length of the dead zone in a second direction orthogonal to the first direction is smaller than the length of the scintillator thin plate on which the is formed in the first direction, and the length of the dead zone in the second direction is orthogonal to the first direction. The scintillator is formed such that a portion of the dead zone is exposed outside at least one end of the scintillator thin plate in the second direction on the substrate formed to be longer than the length of the scintillator thin plate. The surface of the thin plate opposite to the surface on which the light reflection layer is formed is
A first step of bonding with a light transmissive adhesive; a second step of detecting the dead zone exposed outside at least one end of the scintillator thin plate in the second direction; A third step of forming a groove in the area of the dead zone having a length greater than the length of the scintillator thin plate in the direction 2 and reaching the inside of the substrate, and separating the scintillator thin plate by the groove; A partition plate having a length greater than the length of the scintillator thin plate in the second direction is exposed to both ends of the partition plate to the outside of the scintillator thin plate in the second direction. And a fourth step of inserting the radiation detector into the radiation detector. 15. The method of manufacturing a multi-element radiation detector according to claim 10, wherein said light reflection layer comprises an aluminum vapor-deposited layer. 16. The multi-element radiation detector according to claim 10, wherein said partition plate has a width of at least five times a width of said scintillator thin plate separated by said groove in said first direction. A method for manufacturing a multi-element radiation detector, characterized in that it has a dimension that is more convex than the surface. 17. A method for manufacturing a multi-element radiation detector according to claim 11, wherein said light reflecting layer is made of an aluminum vapor-deposited layer. 18. The multi-element radiation detector according to claim 11, wherein said partition plate has a thickness of at least five times a width of said scintillator thin plate separated by said groove in said first direction. A method for manufacturing a multi-element radiation detector, characterized in that it has a dimension that is more convex than the surface. 19. A method for manufacturing a multi-element radiation detector according to claim 13, wherein said light reflecting layer is made of an aluminum vapor-deposited layer. 20. The multi-element radiation detector according to claim 13, wherein the partition plate has a thickness of at least five times the width of the scintillator thin plate separated by the groove in the first direction. A method for manufacturing a multi-element radiation detector, characterized in that it has a dimension that is more convex than the surface. 21. The method for manufacturing a multi-element radiation detector according to claim 14, wherein said light reflecting layer is made of a vapor-deposited aluminum layer. 22. The multi-element radiation detector according to claim 14, wherein the partition plate has a thickness of at least five times the width of the scintillator thin plate separated by the groove in the first direction. A method for manufacturing a multi-element radiation detector, characterized in that it has a dimension that is more convex than the surface.