Patent ID: 7888648

Claim:
In a radiological measurement system including: a radiation detector formed of semiconductor crystal; a high voltage DC supply for applying a bias voltage to the radiation detector; a controller provided between the radiation detector and the high voltage DC supply to exercise on-off control on the bias voltage supplied from the high voltage DC supply; an amplifier for amplifying a detected signal supplied from the radiation detector; and a protection circuit provided between the radiation detector and the amplifier to protect the amplifier from a surge current generated when the bias voltage is subjected to the on-off control, the radiological measurement system comprising: a control unit for preventing the surge current from flowing to the amplifier; and a switch provided in parallel with the protection circuit and controlled in operation state by the control unit, wherein the control unit controls the operation state of the switch in synchronism with the on-off control exercised by the control unit to prevent the surge current from flowing to the amplifier.