Determination of the activities of inhomogeneous samples by gamma spectrometry using energy-dependent self-absorption
- 作者：Korun ; M. ; Martincic ; R. ; Merkan ; M.
- 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
- 出版年：1996
- 期刊代码：41_01689002
- 类别：ph
- 出版时间：February 1, 1996
- 卷：369
- 期：2-3
- 页码：681-683
- 文件大小：323 K
摘要
The <SUP>137Cs activities of inhomogeneous model samples, representing solutions with the radionuclide partially dissolved, were measured and compared to the calibrated values. The samples were composed of a thin homogeneous disc and a homogeneous cylinder placed coaxially on top of it, the disc facing the detector. Four samples with different self-absorption values in the cylinder were prepared. The values of the activities in the disc and cylinder were calculated from the countrates in the lines belonging to the X- and γ-rays. The calculated activities agreed with the calibrated ones within the uncertainties of the measurements. The uncertainties of the measured activities are discussed in terms of the self-absorption, which determines the conditionality of the system of equations expressing the countrates in terms of efficiencies and activities.