| 摘要 |
PURPOSE:To improve statistic accuracy with the lapse of time and to obtain a count value whose indication value is not sharply changed by displaying a counting rate value obtained by dividing an integrated value obtained by integrating values by an adder by the time required from detection start up to the current time. CONSTITUTION:When a radiant ray is injected into a detector 12, low pressure vapor (alcohol steam, etc.) is ionized, electric discharge is generated and a discharge current is instantaneously allowed to flow and A/D converted into a digital signal 100. The signal 100 is amplified by an amplifier 14 and the amplified digital signal 101 is counted by a counter 16. A sampling circuit 20 outputs a timing pulse 102 in each previously set time, the count value 103 of the counted signal 101 is outputted to an adder 18 in each timing and the counter 16 is reset by the count signal 103. The adder 18 integrates the count value 103 successively outputted from the counter 16 and outputs the total number 105 of counts from the count starting point up to the current point to a divider 24. The divider 24 calculates the count rate value, which is displayed on a display device 26.
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