Khater A E M, Ebaid Y Y
Physics and Astronomy Department, Faculty of Science, King Saud University, Riyadh, Saudi Arabia; Nuclear and Radiological Regulatory Authority, Cairo, Egypt.
Physics Department, Faculty of Science, Fayoum University, Fayoum, Egypt.
J Environ Radioact. 2017 Dec;180:120-126. doi: 10.1016/j.jenvrad.2017.10.006.
The accurate evaluation of the absolute intensity of the gamma-ray transition 1001.03 keV of Pa is crucial for accurate determination of U in nuclear material and environmental samples. Over the last decades, a wide range of 1001.03 keV absolute intensity values were published by different researchers and ranged from 0.59 to 1.12%. Nowadays, one of the most commonly used values is 0.847 ± 0.008% that seems not accurate and would eventually lead to an overestimation of U activity concentration. The absolute intensity of 1001.03 keV gamma transition was re-evaluated using different fundamental parameter method (FPM) modes, uranium ore and granite samples, samples' geometries, sample-to-detectors' geometries and gamma ray spectrometers. The mean ± standard deviation of newly optimized absolute intensity value is 1.067 ± 0.084% with an average relative bias of - 20% from the commonly used value.
准确评估镤的1001.03 keV伽马射线跃迁的绝对强度，对于准确测定核材料和环境样品中的铀至关重要。在过去几十年中，不同研究人员公布了一系列1001.03 keV绝对强度值，范围从0.59%到1.12%。如今，最常用的值之一是0.847±0.008%，但这个值似乎并不准确，最终会导致对铀活度浓度的高估。利用不同的基本参数法（FPM）模式、铀矿石和花岗岩样品、样品几何形状、样品与探测器的几何形状以及伽马射线光谱仪，对1001.03 keV伽马跃迁的绝对强度进行了重新评估。新优化的绝对强度值的平均值±标准偏差为1.067±0.084%，与常用值相比平均相对偏差为-20%。
