Since Rn is continuously generated by the decay of Ra, it is difficult to analyze Rn in water containing Ra. To analyze Ra, a large amount of water is passed through a manganese fiber column to adsorb radium, and then radium delayed coincidence counting or gamma-ray spectroscopy is performed approximately four weeks later. A combination technique of radon-emanation and pair-measurement was tested to analyze Ra and Rn in water. Ra and Rn were accurately analyzed within approximately 8 d.
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