Measurement of 233U/234U ratios in contaminated groundwater using alpha spectrometry

The Genie™ 2000 Alpha Analysis and Interactive Peak Fitting (IPF) software packages were used and it was found that IPF with identification of three peaks (234U minor, combined 234U major and 233U minor, and 233U major) followed by interference correction on the combined peak and a weighted average activity calculation gave satisfactory agreement with the AMS data across the 233U/234U activity ratio range (0.1-20) and 233U activity range (2-300 mBq) investigated. Correlation between the AMS 233U and alpha spectrometry 233U was r2 = 0.996 (n = 10).