| 摘要 |
PURPOSE:To accurately detect the simultaneous signal of a radiation ray at a low level at low cost by simultaneously detecting the radiation ray by a photodetector combined to both ends of a scintillation fiber in a sheet-like array. CONSTITUTION:One end of the scintillation fiber 1 formed in the sheet-like array 3 is led to the left half part A of the accumulation type photodetector 2 and the other end is led to the right half part B so as to be superimposed nearly in contact with an object 5. Then, the radiation ray(mainly beta ray) of the object 5 is received by the scintillation fiber 1 and flash light which is divided to right and left almost in the ratio of one to one is simultaneously counted by the half parts A and B of the photodetector and outputted to the outside as an electrical signal. Only the coincident data out of the data of both half parts A and B is judged as the data on the radiation ray, which is constituted and displayed as an image. Thus, the simultaneous signal of one-dimensional or two-dimensional distribution of beta ray at the low level, especially, is accurately detected at low cost and monitored at real time.
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