| 摘要 |
PROBLEM TO BE SOLVED: To measure background concentration of a natural radionuclide such as radon existing in nature, and to rapidly and accurately measure and evaluate an artificial radionuclide such as plutonium. SOLUTION: This measurement device comprises a detector 12 ofαray andβray radiated from a sample, a data processing section 20 for digitally converting a detected signal and processing it, and a personal computer 32 for performing the analysis and display of a result. The data processing section has an energy and time interval measurement system for measuring the time interval of the digital signal obtained by AD-converting an analog pulse, and a high-speed time interval measurement system for measuring the time interval of the analog pulse as it is. The measured data is buffered by a FIFO memory 28, andβ-αcorrelation phenomenon is caught by a personal computer in a time interval analysis method. Thus,αray derived from Po-214 which is descendant nuclide of Rn-222 is extracted selectively, it is removed from the whole to reduce disturbance by Po-214, andαray derived from the artificial radionuclide is measured. COPYRIGHT: (C)2007,JPO&INPIT
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