使用大型伽马射线探测器测量牛奶和水中低水平的131I。
Use of large gamma-ray detector to measure 131I in milk and water at low levels.
作者信息
Rosson R, Garcia R, Kahn B
机构信息
Nuclear Engineering and Health Physics Program, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332-0225, USA.
出版信息
Health Phys. 1996 Nov;71(5):770-2. doi: 10.1097/00004032-199611000-00021.
A lower limit of detection of 0.04 Bq L-1 for measuring 131I in milk or water with a gamma-ray spectrometer was achieved with a large 118% intrinsic germanium detector. Three-liter samples with 131I tracer in a reentrant beaker were counted within a lead shield for 12,000 to 55,000 s to demonstrate detection at this concentration. Samples of milk collected at dairies and counted for 28,000 s showed no 131I at this level (as expected), but 137Cs from fallout was detected in some samples near its detection limit of 0.03 Bq L-1.
使用大型本征锗探测器，在牛奶或水中测量¹³¹I时，伽马射线光谱仪的检测下限达到了0.04 Bq L⁻¹。将含有¹³¹I示踪剂的3升样品置于重入式烧杯中，在铅屏蔽内计数12,000至55,000秒，以证明在此浓度下可检测到¹³¹I。在乳品厂采集的牛奶样品计数28,000秒，结果显示在此水平下未检测到¹³¹I（正如预期），但在一些样品中检测到了沉降物中的¹³⁷Cs，其检测限接近0.03 Bq L⁻¹。
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