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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．
The specific activity of 224Ra, 226Ra and 228Ra in seawater was determined by measuring the gamma rays emitted by the daughter body by HPGey spectrometer after enrichment of radium isotopes in large volume seawater by manganese fiber. The formulas for calculating the specific activity of three nuclides were deduced, and the sample processing and spectral analysis methods were discussed. The method is simple, fast, eliminating the cumbersome process of chemical separation can be determined simultaneously three kinds of nuclides.