DEVELOPMENT OF NEW ANALYTICAL METHOD BASED ON BETA-ALPHA COINCIDENCE METHOD FOR SELECTIVE MEASUREMENT OF ~(214)Bi-~(214)Po-APPLICATION TO DUST FILTER USED IN RADIATION MANAGEMENT

摘要

The radionuclide pair ~(2l4)Bi and ~(2l4)Po which belongs to the uranium series interferes with airborne radionuclide measurement needed for the radiation management of a nuclear facility. Time intervals between ~(2l4)Bi (β) and ~(2l4)Po (α) are much shorter than artificial radionuclides due to the short half-life of ~(2l4)Po (164 μs). The purpose of this study is to develop of a new analytical method (time interval analysis: TIA) based on the beta-alpha coincidence method for selective measurement of ~(2l4)Bi-~(2l4)Po, The developed method was applied to an actual dust-filter measurement. The TIA system was highly effective in measuring of the filter with background subtraction.