| 摘要 |
PROBLEM TO BE SOLVED: To make sensitivity distribution uniform and to make an entire device thin in a radiation detector using a scintillator plate. SOLUTION: Four photomultiplier tubes 18 are arranged equally and symmetrically on a scintillator plate 12. Each of the photomultiplier tubes 18 is connected to a pulse-height discriminator 24 through a corresponding amplifier 22, respectively. Six coincidence counters 26 are provided corresponding to all combinations (4C2=6 combinations) of selecting two out of the outputs from the four pulse-height discriminators 24, and all the possible pairs of output signals of the four photomultiplier tubes 18 is given an AND operation by these coincidence counters 26. An adder 30 is an OR (disjunction) circuit to which six coincidence counters 26 are put in and which puts out their disjunction. An output pulse of this adder 30 is counted by a counter 28, and the count result is putout as a count value of radiation.
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