锰纤维富集-γ能谱法测定海水中的^(224)Ra、^(226)Ra和^(228)Ra

Measurement of ^(224)Ra, ^(226)Ra and ^(228)Ra in sea water using Mn-fiber adsorption-γ spectrum method

采用锰纤维富集大体积海水中的镭同位素，继用HPGey谱仪通过测定子体发射的y射线测定了海水中224Ra、226Ra和228Ra的比活度．推导了3种核素比活度的计算公式，讨论了样品处理和谱分析方法．该法简单、快速，省却了化学分离的繁杂过程，可同时测定3种核素．

After preconcentration of Ra isotopes using Mn-fiber adsorption from large volume sea water, the specific activities of 224Ra, 226Ra and 228Ra are measured through measuring γ- rays of their daughters by HPGe γ-spectrometer. The calculating formulas of specific activities of the three nuclides are derived. The sample preparation and spectrum analysis method are discussed.The advantages of this method are simple, rapid, and three nuclides can be determined simultaneously.