Patent ID: 8658980

Claim:
A radiation detector comprising: (A) a scintillator having scintillation crystals for converting radiation into fluorescence being arranged; (B) a light detector for detecting fluorescence; (C) an intensity-data acquiring device for acquiring intensity data representing intensity of the fluorescence outputted from the light detector for every temporally-constant sampling interval; (D) an intensity-data accumulating device for accumulating the intensity data acquired by the intensity-data acquiring device; (E1) a storing device for storing a plurality of event threshold values; (F) an event detecting device for comparing the intensity data to be acquired successively and an event threshold value for intensity data comparison and recognizing that, when the intensity data exceeds the event threshold value, the event that radiation enters into the scintillator occurs, thereby obtaining an event-occurrence time when the event occurs; (G1) a correction-value acquiring device for acquiring a correction value in accordance with intensity-data and double-event threshold value and multiple-event threshold value, the intensity data being detected prior to the event-occurrence time and the correction value being used for correcting variations in intensity data resulting from afterglow of the fluorescence; and (H) an integration device for calculating an integrated value by integrating the intensity data detected prior and subsequent to the event-occurrence time and performing correction using the correction value.