Measurement of ~224Ra, ~226Ra and ~228Ra in seawater using Mn-fiber adsorption-γ spectrum method

摘要

The specific activities of ~224Ra, ~226Ra and ~228Ra were determined by measuring γ-rays of their dughters with HPGe γ spectrometer after preconcentrating Ra isotopes 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.