Watson W S
Department of Clinical Physics and BioEngineering, Southern General Hospital, Glasgow, Scotland.
Clin Phys Physiol Meas. 1987 Nov;8(4):337-41. doi: 10.1088/0143-0815/8/4/006.
As a result of fallout from the nuclear accident at Chernobyl in April 1986, the caesium radioisotopes, 134Cs and 137Cs, have been detected in man. A minor consequence of this is that total body potassium (TBK) measurements obtained from the whole body activity of 40K, a naturally occurring radioisotope of potassium, can be overestimated because of gamma spectrum overlap between 134Cs and 40K. Whole-body activities for 134Cs and 40K were measured in 18 healthy adults (13 M, 5 F) in June/July, 1986, using a whole-body counter with NaI crystal scintillation detectors. Studies using anthropometric phantoms containing known activities of the two radionuclides, allowed the contribution of 134Cs to the '40K activity' in the human subjects to be assessed. The group mean 134Cs level was 172 Bq, resulting in an average overestimate in TBK of 2.8%. It is recommended that when TBK measurements are being undertaken and 134Cs contamination is suspected, then 134Cs levels should be measured and their effect corrected for.
由于1986年4月切尔诺贝利核事故产生的放射性尘埃，人体中检测到了铯放射性同位素134Cs和137Cs。由此产生的一个次要后果是，通过天然存在的钾放射性同位素40K的全身活性获得的全身钾（TBK）测量值可能会被高估，因为134Cs和40K之间存在γ谱重叠。1986年6月/7月，使用配备碘化钠晶体闪烁探测器的全身计数器，对18名健康成年人（13名男性，5名女性）的134Cs和40K全身活性进行了测量。通过使用含有两种放射性核素已知活性的人体测量模型进行研究，可以评估134Cs对人体受试者“40K活性”的贡献。该组134Cs的平均水平为172贝克勒尔，导致TBK平均高估2.8%。建议在进行TBK测量且怀疑存在134Cs污染时，应测量134Cs水平并对其影响进行校正。
