| 摘要 |
PURPOSE:To obtain the titled device with which the accuracy of measurement is greatly increased, by obtaining the measured value of a sample by subtracting the background value before and after the measurement of the sample or the averaged value of the count factor from the count value during the measurement of the sample. CONSTITUTION:The measured value of a sample is obtained by subtracting the background count value before and after the measurement of the sample or the averaged value of the count factor from the count value during the measurement of the sample. For instance, a radiation detector 13 is connected to an arithmetic circuit 16 via an amplifier 14 and a counter 15. At the same time, a control part 12 is also connected to the circuit 16. The part 12 delivers the timing control signals which are obtained right before the existence of a sample 11, during the existence of the sample and right after a moment when the sample does not exist any more respectively. The circuit 16 stores the count values in a certain period of time right before the measurement, during the measurement and right after the measurement of the sample 11 respectively into a memory based on the timing control signal given from the part 12. Then the background count value before and after the measurement of the sample is subtracted from the count value during the measurement of the sample. |
