| 摘要 |
PURPOSE:To enable soundness of a function for measuring a dose to be checked by allowing an output voltage to be changed to an inverse bias voltage and a zero voltage at a specified cycle by adding a check mode command to an inverse-bias application means between both electrodes of a semiconductor detector. CONSTITUTION:A constant control signal 21a is turned and a control signal 21b is turned off on while a switch 12 is off, thus enabling an inverse-bias voltage Vb to be applied to a detector 2 continuously by a voltage switching part 24. A dose for radiant rays 4 is measured by a counter signal 11a. Also, while the switch 12 is turned on, a voltage pulse train consisting of a pulse 8a4 appears intermittently at an output of a preamplifier 6 as a pulse train signal 8a, thus enabling check for soundness of a function for measuring the dose in a measuring equipment 26 as well as that for an inverse-bias voltage application means 25 to be performed with the counter signal 11a.
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