~(~(235))U-gamma emission contribution to the 186 keV energy transition of Ra in environmental samples activity calculations

摘要

This work aims at developing a simple and reliable empirical equation to distinguish between counting rate contributions from both ~(235)U and ~(~(236))Ra to the 186 keV energy region. The method has set primarily two assumptions. First was the existence of secular equilibrium between the ~(238)U and the ~(~(236))Ra iu the samples. The calculations showed that in the total count rate of the 186 keV peak consists of 58.3% of ~(~(236))Ra and 41.7% of ~(235)U at a radioactive equilibrium. Second was the absence of equilibrium, this condition needed another treatment of the obtained data. Finally, simple equations have been developed to calculate ~(236)Ra and ~(235)U in unenriched samples.