Direct determination of 226Ra in NORM/TENORM matrices by gamma-spectrometry
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The main shortcoming with the procedure to determine 226Ra in a gamma spectrum of an environmental sample by means of the 214Bi and 214Pb photopeaks is the likelihood of 222Rn leakage from the sample counting vial. An option to make such determination is to disregard the 226Ra gamma-contributions to the spectrum, other than 186.2 keV (3.5%), subtracting the 235U contribution to the 226Ra+235U peak at 186 keV. The use of this option to determine directly 226Ra activity concentrations in environmental samples and in NORM/TENORM matrices will be presented and discussed.
KeywordsActivity Concentration Environmental Sample 238U Activity 226Ra Concentration United Nations Scientific Committee
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