| 摘要 |
PURPOSE:To reduce the number of photomultipliers so as to simplify a multiple sample radiation measuring device with a simultaneous counting system for measuring the radiation of each sample by a pair of photo-multipliers. CONSTITUTION:As one photomultiplier between a pair of photomultipliers, an individual photomultiplier 30 is disposed for each sample 12. As the other photomultiplier, a common photomultiplier 32 used in common for plural sample is disposed. Simultaneous counting circuits provided sample by sample receives detection pulses from the individual photomultipliers 30 and common photomultiplier 32. Each simultaneous counting circuit counts only in the case of obtaining two detection pulses simultaneously.
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