Abstract
A determination method using an extraction chromatographic resin (EiChroM Sr.Spec™) has been developed for 210 Pb and 210 Po in environmental samples by alpha ray spectrometry. 210 Pb and 210 Po were coprecipitated simultaneously on CuS at pH 4.0 - 5.5. These nuclides were then adsorbed on a Sr.Spec™ resin column (0.79×4.0 cm) in 4 M HCl. The 210 Pb and 210 Po on the resin were eluted with 8 M HCl and 6 M HNO3, respectively. 210 Po was determined by alpha-ray spectrometry after plating on a stainless-steel disk. 210 Pb was determined as 210 Po produced from 210 Pb decay. The method was applied to soil (IAEA-326) and sediments (NIST-4354, IAEA-135, IAEA-368) standard reference materials, and the results agreed with their recommended values. The chemical yield of Po ranged from 56 to 99% and the yield of Pb was 95%. The detection limits of 210 Pb and 210 Po were 0.6 mBq/sample at a counting time of 70000 s.
