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- W1989823946 abstract "Abstract The simultaneous counting of 226 Ra from environmental samples and 133 Ba added as a yield tracer is described. A liquid scintillation counter with pulse shape discrimination was used. The 226 Ra decay emissions were recorded in the α-multi-channel analyser (α-MCA) and the 133 Ba emissions simultaneously recorded in the β-multi-channel analyser (β-MCA) using experimentally determined discriminator settings. The 226 Ra α-decay products were counted after four weeks ingrowth with an optimum counting efficiency of 250% (2.5 cps Bq −1 ) and an α-background of 0.002 cps within the channels corresponding to 300–900 keV. Emissions resulting from decay of 133 Ba by electron capture, and the two emissions produced by the β-decay of the 214 Pb and 214 Bi daughters of 226 Ra were counted in the β-MCA. The 133 Ba decay products were counted with an efficiency of 7% (0.07 cps Bq −1 ) in the channels of the β-MCA corresponding to 1–50 keV. The ratio of counts from 226 Ra in these channels to the counts from 226 Ra in the 300–900 keV range of the α-MCA was found experimentally to be 0.148 over a broad range of 226 Ra activities. In analyses the 133 Ba yield tracer was added to each sample before radiochemical separation in preparing for liquid scintillation counting. Counts in the α-MCA were used as a measure of the 226 Ra activity, then this was used to estimate the 226 Ra β-contribution and hence the net count rate of 133 Ba. Comparison of the 133 Ba count rate with the standard addition was finally used to correct the 226 Ra α-count for recovery. Addition of 10 Bq of 133 Ba gave counting errors of about 1%. The simultaneous counting of 133 Ba and 226 Ra is simpler than separate counting of the 133 Ba by γ-spectrometry using Nal or Ge detectors." @default.
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- W1989823946 date "1996-10-01" @default.
- W1989823946 modified "2023-09-27" @default.
- W1989823946 title "Simultaneous measurement of 226Ra and 133Ba using liquid scintillation counting with pulse shape discrimination" @default.
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- W1989823946 doi "https://doi.org/10.1016/0003-2670(96)00243-7" @default.
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