224Ra correction for determination of 226Ra in environmental materials

The most commonly available 226Ra determination was too time-consuming to be suited to 226Ra monitoring for the accidental release. The formula for determination of 226Ra was derived by 224Ra correction for WHO's equation. A rapid determination of 226Ra in environmental materials was made possible by using this formula. The 226Ra values of the soil and natural water at Ningyoh-Tohge obtained by the present method were in good agreement with those by the conventional WHO method. It was demonstrated that 226Ra of more than about 37 mBq (1 pCi) in the sample could be determined within 4 days by this method.