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- W1584448795 abstract "Uranium, thorium and actinium series nuclides were analyzed in fern (Gleichenia japonica) leaves and some plant foodstuffs (viz. Brazil nuts, sesame seeds, green tea, soybean and raisins) by γ-ray spectrometry. 226Ra, 228Ra and 228Th were detected in all samples except for the soybean and raisins. Actinium-227 was also detected in the fern samples. Neutron activation analysis of the samples showed that the 232Th activities in the samples (except for the soybean and raisins) were negligible compared with those of 228Ra. 228Th in the samples was assumed to have grown from 228Ra in situ and the 228Ra 228Th ages of the samples were calculated from the 228Th228Ra activity ratios. The ages estimated for the fern leaves may provide information about the rate of their radium uptake, while those for the plant foodstuffs enable us to infer the date of collection of samples." @default.
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- W1584448795 date "1985-07-01" @default.
- W1584448795 modified "2023-10-05" @default.
- W1584448795 title "dating of plant samples" @default.
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- W1584448795 doi "https://doi.org/10.1016/0020-708x(85)90108-5" @default.
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