| 摘要 |
PURPOSE:To perform the self-diagnosis of the abnormality of a sensor and a circuit in a radiation non-emitting state by mounting a sensor means, an amplifying means, a peak discrimination and comparison means, a counting means, a bias means and a voltage control means. CONSTITUTION:A voltage control circuit 21 converts the data from a CPU 7 to analogue data by a D/A converter to supply the same to a bias power supply 20 and a sensor array 1 is composed of a semiconductor detector or a scintillator composed of Si or CdTe enchanced in impedance. When a change is generated in the bias power supply 20, the almost same signal is detected in an amplifier 2. The sensor array 1 acts as a condenser because of high impedance and, therefore, a signal is taken in the CPU 7 through a comparator 3, a counter 4 and a latch circuit 5. As a result, when abnormality is present in the sensor or the circuit system, this abnormality can be discovered by the CPU 7.
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