Hashimoto T, Masumura S, Komatsu S, Sotobayashi T
Radioisotopes. 1982 Sep;31(9):453-8.
The concentrations of 210Pb and 210PO in several snow samples were determined using alpha-spectrometry. After 5 l of snow-melt water was subjected to coprecipitation of both nuclides with AlPO4, the solvent extraction procedure with TBP (tri-butyl phosphate)-isopropyl ether was applied to purify the polonium fraction, followed by the spontaneous electro-deposition on a Ni-sheet. The alpha-spectrum was measured with a Si(Au)-semiconductor detector coupled with a multichannel pulse-height analyzer. After the first determination of 210PO, the concentration of 210Pb was estimated from second measurement of 210PO grown newly from the remaining Pb-fraction during the storage period of more than 3 months. In these analytical procedures, 212Pb and 208PO tracers were conveniently utilized for the determination of collection yield for 210Pb and of the final chemical yield of 210PO, respectively. The contents of 210PO and 210Pb in the fresh snow were 3--30 mBq/l(81--810 fCi/l) and 250--720 mBq/l (6.8--19.5 pCi/l), respectively, and the residence time of 210Pb was given to be 6--12 days from the decay-growth relationships of both nuclides.
采用α能谱法测定了几个雪样中210Pb和210Po的浓度。将5升融雪水用AlPO4对两种核素进行共沉淀后，采用磷酸三丁酯（TBP）-异丙醚溶剂萃取程序纯化钋组分，然后在镍片上进行自发电沉积。用与多道脉冲高度分析仪联用的Si（Au）半导体探测器测量α能谱。在首次测定210Po后，通过对储存3个月以上期间从剩余铅组分中新生成的210Po进行第二次测量来估算210Pb的浓度。在这些分析程序中，212Pb和208Po示踪剂分别方便地用于测定210Pb的收集产率和210Po的最终化学产率。新鲜雪中210Po和210Pb的含量分别为3--30 mBq/l（81--810 fCi/l）和250--720 mBq/l（6.8--19.5 pCi/l），根据两种核素的衰变-生长关系，210Pb的停留时间为6--12天。
