尿中カルシウムより推定した尿中⁹⁰Srの日々の変動

尿分析による⁹⁰Sr身体負荷量推定における誤差の原因

抄録

Dary-to-day variation of urine ⁹⁰Sr may produce error in the assessment of body ⁹⁰Sr by urinalysis. Based on the good correlation between urine ⁹⁰Sr and Ca, the range of the day-to-day variation of urine ⁹⁰Sr was inferred from that of calcium, which was obtained from the analysis of about 50 to 100 urine samples per person in seven volunteers. From the frequency dstribution curves of urine calcium, it was concluded that 90per cent of the daily urine ⁹⁰Sr would be involved in the range from 0.4 to 2.0 times the mean value. Therefore, if the assessment of body ⁹⁰Sr is made from only one urinary excretion level, the estimated body burden will probably be in the range between 0.4 and 2 times the correct value.