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Detector for radiation

A radiation detector, radiation technology, applied in the direction of cathode ray tube/electron beam tube, discharge tube, electric solid device, etc., can solve the problems of short circuit, light receiving surface unable to function, uneven electric field, etc.

Inactive Publication Date: 2008-12-24
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] In a light-receiving element using an avalanche multiplication film formed of amorphous selenium, a relatively high bias voltage (bias voltage), so that even if a protrusion of about 0.1 μm is formed on the transparent glass panel in the light-receiving surface, an uneven electric field will be generated at this time, and as a result, it will locally become a pinhole (pin-hole) defect and cause short circuit
When the light-receiving surface is formed of only a single pole, even if a part is short-circuited, the entire light-receiving surface cannot function

Method used

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  • Detector for radiation
  • Detector for radiation
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Embodiment Construction

[0096] (First Embodiment) Hereinafter, the configuration of the first embodiment of the radiation detector of the present invention is shown in the drawings, and will be described in detail based on the embodiment. figure 1 It is a cross-sectional view in the X direction viewed from the Y direction of the radiation detector 10 of the present invention. In this embodiment, the case of an isotropic voxel detector is shown, so the cross-sectional view (side view) in the Y direction obtained by viewing the radiation detector 10 from the X direction also forms the same figure 1 same shape. The radiation detector 10 includes: a scintillator group 12 which is divided by appropriately interposing a light reflective material 13 and two-dimensionally densely arranged with six scintillator groups 12 in the X direction and six in the Y direction; a scintillator 11; a light guide 14, which is optically combined with the scintillator group 12, and embedded with a lattice frame combined w...

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Abstract

To avoid the problem of local pinhole defect in avalanche multiplication.Before an anode and a cathode are assembled as a light receiving element, the position of a pinhole defect is specified by a defect position specifying vacuum container having a previously prepared field emission array for inspection. If the cathode is the field emission array when the anode and cathode are assembled as an actual light receiving element, they are assembled such that a field emission chip corresponding to the position of the pinhole defect does not perform electron beam discharge operation for the field emission array as an actual detector.

Description

technical field [0001] The present invention relates to a radiation detector, such as a medical diagnostic device for a Positron Emission Tomography (PET) device or a Single Photon Emission Computed Tomography (Single Photon Emission Computed Tomography, SPECT) device. The device is used to detect the radiation (gamma ray (gamma ray)) emitted by the radioactive isotope (Radioactive Isotope, RI) accumulated in the target part to obtain the tomographic image of the RI distribution of the target part (tomogram). Background technique [0002] This kind of radiation detector includes: a scintillator (scintillator), which injects gamma rays emitted by the measured part to emit light; and a photomultiplier (Photomultiplier), which converts the light emission of the scintillator into pulse (pulse) electrical signal. For this kind of radiation detector, in the past, scintillators and photomultiplier tubes were in one-to-one correspondence, but in recent years, the following method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/12H01J31/49H04N5/32H01L27/14H01L31/09
CPCH01J31/49H04N5/30
Inventor 户波宽道大井淳一
Owner SHIMADZU SEISAKUSHO CO LTD