At least prompt gamma-ray and the incident hadron beam which generates the neutron (10) by the above-mentioned target (20) in colliding, the above-mentioned target (20) the territory (25) being the method real time of measuring the local dose which is received, the above-mentioned target (20) from the particle which is discharged at the same time the above-mentioned target (20) in the above-mentioned target (20) the above-mentioned territory (25) by the Cori mate doing, the method of being measured the above-mentioned territory which is measured (25) from the detector (45) by arranging in position of distance L. The above-mentioned detector (45), we have possessed particle energy and the above-mentioned expedient which measures particle duration of flight, above-mentioned detector (45) the number of prompt gamma-rays which are received is decided by selecting the phenomenon which is recorded, in order to offer spatial information concerning prompt gamma-ray, the above-mentioned target (20) compared to the incident hadron beam before (10) is arranged in, in order bidirectional charged particle detection systems, the incident hadron (10) to acquire intersection position, it is used.
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