Rybacek K, Jacob P, Meckbach R
GSF-Forschungszentrum für Umwelt und Gesundheit GmbH, Institut für Strahlenschutz, Neuherberg, Germany.
Health Phys. 1992 Jun;62(6):519-28. doi: 10.1097/00004032-199206000-00004.
When applying the standard method of in-situ gamma spectrometry to determine deposited radionuclide activities, an assumption is needed regarding the depth distribution of radionuclides in the ground. The method can be improved by assessing, from information contained in the spectrum, the attenuation of the radiation by the soil and vegetation. By comparing the count rates of the x ray and the gamma-ray lines of its daughter nuclide 137mBa, the 137Cs activity per area can be determined. The range of applicability of the method is discussed by means of an uncertainty analysis, and the method is applied to post-Chernobyl measurements. A comparison with the results of the standard method of in-situ spectrometry demonstrates the progress achieved by the proposed method. Nevertheless, the method still has some shortcomings for the peak analysis that could be improved by better detector resolution or better computer software.
在应用标准的原位伽马能谱法测定沉积的放射性核素活度时，需要对放射性核素在地下的深度分布做出假设。通过从能谱中包含的信息评估土壤和植被对辐射的衰减，可以改进该方法。通过比较其子核素137mBa的X射线和伽马射线谱线的计数率，可以确定单位面积的137Cs活度。通过不确定性分析讨论了该方法的适用范围，并将该方法应用于切尔诺贝利事故后的测量。与原位能谱法的标准方法结果进行比较，证明了所提方法取得的进展。然而，该方法在峰分析方面仍存在一些缺点，可通过提高探测器分辨率或改进计算机软件来加以改善。
