| 摘要 |
PURPOSE: To provide a radiation detector by which a radiation can be measured without a detection error and precisely. CONSTITUTION: An electric charge Q corresponding to energy of photons by X-rays which are incident on an X-ray sensor element is stored in respective capacitors 3a, 3b at Q/2 and -Q/2, and it is output as a voltage V across output terminals 1c, 1d for a differential amplifier 1. Then, switches 4a, 4b are turned on by a control means 6 in order to discharge the stored electric change, and both switches 4a, 4b are then turned off simultaneously. Then, electric charges which have been stored in parasitic capacitors of both switches are discharged simultaneously, and an influence on the voltage V across the output ends 1c, 1d by the changeover operation of the switches is removed. In addition, the capacitance Cp of a correction capacitor 5 is set in such a way that a capacitance across a negative voltage source 7 and an input terminal 1a becomes nearly equal to a capacitance across the negative voltage source 7 and an input end 1b. As a result, even when the potential of the negative voltage source 7 is changed, equal electric charge, amounts are injected into both signal lines for the differential amplifier 1, and an influence on the output voltage V is removed.
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