Tolstykh E I, Degteva M O, Kozheurov V P, Shishkina E A, Romanyukha A A, Wieser A, Jacob P
Urals Research Center for Radiation Medicine, Medgorodok, Chelyabinsk, Russia.
Radiat Environ Biophys. 2000 Sep;39(3):161-71. doi: 10.1007/s004110000059.
People living on the banks of the Techa river were exposed to 90Sr in the early 1950s. Data obtained by radiochemical measurements of extracted permanent teeth, 90Sr autopsy measurements in bone and tooth samples, in vivo measurements of surface beta activity of the anterior teeth and whole-body counter (WBC) measurements of 90Sr in the skeleton have been analyzed. Surface beta activity measurements indicate a biological half-life of 90Sr of about 35 years in enamel. The WBC measurements have been performed since 1974 and a model for the age-dependent strontium retention in human bone has been used to extrapolate to previous time periods when the other measurement results were obtained. For the first decade after the intake, the ratio of the 90Sr concentrations in teeth and bones were found to decrease with age at the time of major intake, from about 10 for 1-year-old children to about 0.3 for adults. There was a considerable variability of individual data within each age group. For adults, the correlation between 90Sr in skeleton and teeth was not high at 0.47 according to radiochemical data for posterior teeth (molars and premolars) and 0.43 according to measurements of surface beta activity for anterior teeth. For children and adolescents there was no correlation between individual measurements in the skeleton and teeth. The absorbed dose in enamel due to 90Sr in dentine has been calculated by Monte Carlo simulations of the electron transport. The results are in agreement with EPR measurements of the absorbed dose in the enamel of persons exposed, mainly due to 90Sr ingestion.
20世纪50年代初，生活在捷恰河畔的人们接触到了锶-90。已对通过对提取的恒牙进行放射化学测量、对骨骼和牙齿样本进行锶-90尸检测量、对前牙表面β活性进行体内测量以及对骨骼中的锶-90进行全身计数器（WBC）测量所获得的数据进行了分析。表面β活性测量表明，锶-90在牙釉质中的生物半衰期约为35年。自1974年以来一直进行WBC测量，并使用了一个人类骨骼中锶保留随年龄变化的模型来推断获得其他测量结果的先前时间段。在摄入后的第一个十年中，发现牙齿和骨骼中锶-90浓度的比值在主要摄入时随年龄下降，从1岁儿童的约10降至成年人的约0.3。每个年龄组内的个体数据存在相当大的变异性。对于成年人，根据后牙（磨牙和前磨牙）的放射化学数据，骨骼和牙齿中锶-90的相关性不高，为0.47；根据前牙表面β活性测量，相关性为0.43。对于儿童和青少年，骨骼和牙齿的个体测量之间没有相关性。通过电子传输的蒙特卡罗模拟计算了牙本质中锶-90对牙釉质的吸收剂量。结果与主要因摄入锶-90而受照射者牙釉质中吸收剂量的电子顺磁共振测量结果一致。
