| 摘要 |
PURPOSE:To obtain high uniformity of measurement regardless of the peak energy of the mesuring object, by making use of a level supplier adapted to vary the level of flexing point of polygonal nonlinear circuit in conformity with the objective radioactive energy. CONSTITUTION:The output signal from a photoelectric multiplier 4 is varied by an attenuator 5 in accordance with the radioactive energy to be measured, to obtain matching for the detection processing system. The level of the flexing point of polygonal nonlinear circuit 91 is determined by a level supplier 14 which operates in response to the operation of the attenuator 5 and is delivered to the circuit 91. Thus, the level of the flexing point is changed in response to the operation of the attenuator 5. In consequence, it is possible to obtain a high uniformity of the measurement regardless of the change of peak energy of the objective radioactive ray source, without any deterioration of the resolution. |
