:An Supplementary Examination of the Method Reported by EAKINS et al., and Comparison with a Method Using Coprecipitation

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The method of the determination of gross α activity in urine by adsorption on glass fibre filter paper (EAKINS et al.; Health Phys., 14, 461) is considered suitable as a routine procedure. The method was re-examined for both procedure and recovery of some actinoids from standpoint of routine assay. As a result, it turned out that an initial concentration step for the separation of actinoids from urine with coprecipitation with calcium and magnesium phosphate can not be omitted. Recoveries observed by the present study are generally compatible with that of reported by EAKINS et al., for uranium, neptunium and americium, but considerably lower recovery was observed for plutonium. In some cases, very low recoveries were observed for all of actinoids examined, however, the method can be compared advantageously with a gross α activity determination method using coprecipitation. Practically, it is concluded that it requires further investigation specially on the fluctuation of the recovery for actinoids.
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