Radiation signal-processing unit and radiation detector provided with the same

A radiation detector for correcting detection signals of annihilation radiation-pairs, comprising:

• a scintillator having scintillation counter crystals for converting radiation into fluorescence arranged two-dimensionally;
• a light detector for detecting fluorescence;
• a position identifying device for receiving the detection data outputted from the radiation detector with the scintillator and identifying an incident radiation position in the radiation detector based on the data;
• a count data-memory device for storing positional information outputted from the position identifying device;
• a count ratio-calculation device for calculating a count ratio as a ratio of count numbers of radiation in different positions in the radiation detector that varies in accordance with temporal overlap of fluorescence each other to be detected based on the positional information memorized in the count data-memory device;
• a reference count ratio-memory device for memorizing a reference count ratio as a count ratio calculated under a state where fluorescence to be detected does not overlap each other temporally;
• and
• a correction instruction device for reading the reference count ratio from the reference count ratio-memory device and comparing the ratio with the count ratio, thereby instructing execution of correction of a radiation generating position to the position identifying device,
• the count ratio-calculation device and the correction instruction device repeating the above operations for every fixed period.