Abstract
Time interval analysis (TIA), which is one type of delayed coincidence method, was applied to 214Bi-214Po correlated events with a microsecond scale (214Po half-life: 164μs) . A measurement system with a silicon semiconductor detector was constructed in combination with a special time recording device and a personal computer. This system was designed to shorten dead time. The basic performance of this system was examined using an electrodeposited 230Th source and actual dust samples. The measurement data for the time intervals of neighboring pulses were analyzed by a single time interval analysis (STA) .The following results were obtained. (1) The 214Bi-214Po correlated events, which are included in Rn-progeny, were used for sensitive measurement by the TIA method. (2) Theories for 214Po mmeasurement using the TIA method were established. (3) The measurement system for 214Po was developed. (4) Efficiency and detection limit of measurement system were discussed through the experiment with an electrodeposited 230Th source and dust samples.The present method is applicable to on-line monitoring of a-ray measurements, because the TIA method is able to detect any artificial a-decay radionuclides by compensating for disturbance due to Rn progenies.
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