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- W2371917690 abstract "?79)Se is a long lived fission product nuclide. Scientists gradually pay attention to ￣(79)Se owing toits importance in radiowaste disposal.Its half life value must be known accuratelv in order to cal-culate its content in radiowaste and the radiation dose of ￣(79)Se migrated to biosphere. Up to now,however,there is no accurate value inkerature, In 1949 Parker et al.measured the half life of ￣(79)Se,but they only obtained an upper limit,T_(1/2)≤6.5×10￣4a,which is still used at present in nu-dear data literatureq. In the present work,the half life of ￣(79)Se has been measured using radioChemical method.Ra-diochemically pure ￣(79)Se is separated from irradiated ￣(235)U targets and its activity is measured by aliquid scintillation spectrometer. According to its fission yield the number of’9Se nuclei is calculat-ed by means ofhsion monitors.￣(137)Cs and ￣(90)Sr are selected as monitors. The activitv is measuredusing HPGe γ spectrometer for ￣(137)Cs and Cherenkov liquid scintillation counting for ￣(90)Sr. The halflife of ￣(79)Se is obtained to be(4.8±0.4)×10￣5a." @default.
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- W2371917690 date "1995-01-01" @default.
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- W2371917690 title "Measurement of half-life of 79 Se using radiochemical method" @default.
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