一种利用同轴锗探测器测定沉积物样品中低能伽马发射体的半经验方法。
A semi-empirical approach for determination of low-energy gamma-emmiters in sediment samples with coaxial Ge-detectors.
作者信息
San Miguel E G, Perez-Moreno J P, Bolivar J P, García-Tenorio R
机构信息
Departamento de Física Aplicada, EPS La Rábida, 21819-Palos, Huelva, Spain.
出版信息
Appl Radiat Isot. 2004 Aug-Sep;61(2-3):361-6. doi: 10.1016/j.apradiso.2004.03.009.
A simple method for the determination in sediment samples of low-energy gamma-emitters with coaxial Ge detectors and using a cylindrical sample geometry is outlined. This method allows an easy estimation of self-absorption effects by knowing the apparent densities and the composition of the investigated samples. As calibration matrixes solid samples enriched in known amounts of natural radionuclides emitting low-energy gamma rays were used. In this way, the difficult homogenisation steps needed when liquid spikes are added to a solid blank for manufacturing the calibration sample are avoided. The method has been carefully checked and validated by applying it to sediment samples with known activities of some low-energy gamma-ray emitters. Additionally, these sediment measurements have allowed to evaluate the magnitude and importance of the self-absorption corrections.
概述了一种使用同轴锗探测器并采用圆柱形样品几何形状来测定沉积物样品中低能γ发射体的简单方法。通过了解被研究样品的表观密度和组成，该方法能够轻松估算自吸收效应。作为校准基质，使用了富含已知量发射低能γ射线的天然放射性核素的固体样品。通过这种方式，避免了在向固体空白中添加液体标样以制备校准样品时所需的困难的均匀化步骤。通过将该方法应用于具有某些低能γ射线发射体已知活度的沉积物样品，对该方法进行了仔细检查和验证。此外，这些沉积物测量还能够评估自吸收校正的幅度和重要性。
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