Uda T, Iba H
Health Phys. 1985 Sep;49(3):479-89. doi: 10.1097/00004032-198509000-00009.
The detection efficiencies of solid-state nuclear track detectors, made with cellulose nitrate materials (LR-115 II) or allyl diglycol carbonate (CR-39) were investigated. Detection efficiency for a surface alpha source was experimentally obtained by changing the dimensions between the detector and the source, while alpha-particle incident efficiency was calculated. The ratio of the detection efficiency to the incident efficiency was then determined. It was confirmed that the ratio for LR-115 II was dependent on energy, but for CR-39 the ratio showed almost no dependency. Considering the relationship between solid absorber thickness and detection efficiency of the surface alpha source, detection efficiencies of U in various metals were estimated. The efficiency for U contained in Al and Fe was proposed as 16% for LR-115 II and 22% for CR-39. Using these efficiencies, amounts of U in some Al and Fe ingots were determined. These agreed with concentrations obtained by neutron-activation analysis with deviations of less than 15%.
研究了用硝酸纤维素材料（LR - 115 II）或碳酸二甘醇烯丙酯（CR - 39）制成的固态核径迹探测器的探测效率。通过改变探测器与源之间的距离，实验获得了表面α源的探测效率，同时计算了α粒子的入射效率。然后确定了探测效率与入射效率的比值。结果证实，LR - 115 II的该比值取决于能量，但CR - 39的该比值几乎与能量无关。考虑到固体吸收体厚度与表面α源探测效率之间的关系，估算了各种金属中铀的探测效率。对于LR - 115 II，铝和铁中所含铀的效率估计为16%，对于CR - 39为22%。利用这些效率，测定了一些铝和铁锭中的铀含量。这些结果与通过中子活化分析获得的浓度相符，偏差小于15%。
