Radiation detector
A radiation detector, three-dimensional technology, applied in the direction of radiation measurement, radiation intensity measurement, instruments, etc.
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no. 1 example
[0088] In the first embodiment, as Figure 5 As shown, a radiation detector in which scintillation blocks 13 are stacked in the z direction was fabricated. Figure 5 is a schematic sectional view of the radiation detector of the first embodiment.
[0089] The scintillation block 13 is Ce:GAGG (Ce:Gd 3 al 2 Ga 3 o 12 ) (hereinafter referred to as "Ce:GAGG") crystallization. The shape is a cube of 3 mm in length x 3 mm in width x 3 mm in height.
[0090] Five scintillator blocks 13 were stacked along the z direction with an air layer (interposer layer 15 ) having a thickness of 10 μm being sandwiched therebetween. Next, the entire outer periphery of the side surface of the laminated body was covered with a fluororesin film (light-shielding layer 14 ) having a thickness of 1 mm. Then, silicon photomultiplier tubes (light-receiving element 10 and light-receiving element 11 ) with a light-receiving surface of 3 mm×3 mm were optically coupled to both ends of the laminate in t...
no. 2 example
[0094] In the second embodiment, as Figure 7 As shown, a radiation detector in which scintillation blocks 13 are three-dimensionally arranged (4×4×4) was fabricated. Figure 7 is a schematic sectional view of the radiation detector of the second embodiment.
[0095] The scintillation block 13 is Ce:GAGG crystal. The shape is a cube of 3 mm in length x 3 mm in width x 3 mm in height. The interlayer 15 forms an air layer with a thickness of 10 μm. The light-shielding layer 14 has a thickness of 0.2 mm and contains barium sulfate. In addition, the light-shielding layer 14 is provided in the boundary surface of the scintillator block along the height direction H (in the Figure 7 , is the entire boundary surface extending in a direction parallel to the z direction). In addition, the entire outer peripheral side of the three-dimensional laminated scintillator 12 obtained by three-dimensionally arranging (4×4×4) scintillator blocks 13 is covered with the light-shielding layer ...
no. 3 example
[0098]In the third embodiment, as the scintillation block 13, LYSO doped with cerium (Ce: (Lu, Y) 2 SiO 5 ) (hereinafter referred to as "Ce:LYSO") crystallization. Other structures are the same as those of the radiation detector of the first embodiment.
[0099] Irradiate the gamma ray of 662keV from cesium 137 radiation source to above-mentioned radiation detector, after using formula (1) to analyze the voltage pulse signal output from each silicon photomultiplier tube, can obtain Figure 9 The position-resolved spectra are shown. The position resolution performance in the z direction reaches a performance capable of distinguishing the position of a scintillation block with a thickness of 3 mm at a resolution of FWHM=0.4 mm, and the energy resolution is 11.3%.
[0100] From the above, it can be seen that the radiation detector of the present embodiment obtained by arranging a plurality of radiation detectors of the third embodiment in parallel has excellent position resolu...
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