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The specific activities of ~(224) Ra, ~(226)Ra and ~(228)Ra were determined by measuring γ-ray of their daughters with HPGe γ spectrometer after preconcentrating Ra isotope with Mn-fiber adsorption from large volume seawater. The calculating formulas of specific activities of the three nuclides were de rived. The methods of sample preparation and spectrum analysis were discussed. The advantages of the method are simple, rapid and three nuclides can be determined simultaneously.
The specific activities of ~ (224) Ra, ~ (226) Ra and ~ (228) Ra were determined by measuring γ-ray of their daughters with HPGe γ spectrometer after preconcentrating Ra isotope with Mn-fiber adsorption from large volume seawater. calculating formulas of specific activities of the three nuclides were de rived. The methods of sample preparation and spectrum analysis were discussed. The advantages of the method are simple, rapid and three nuclides can be determined simultaneously.