Sample thickness effect on detection efficiency HPGe γ spectrometer
- 1. School of Geography Science, Nanjing Normal University, Nanjing (China)
Description
Detection efficiency of HPGe γ spectrometer is an important performance and has a greater impact on radioactivity measurement results of soil samples. By measuring γ-rays from 210Pb(46.5 keV), 214Pb(351.9 keV), 7Be(477.6 keV) and 137Cs(661.7 keV) in soil samples of 15-95 mm in thickness(solid angles of ∼100 degree- ∼60 degree), the relationship were investigated between the sample thickness and the γ-ray counts obtained by efficiency calibration or comparative measurements. The results showed that the detection efficiency decreases with increasing sample thicknesses, with the largest ratio (3.5) of maximum/minimum detection efficiency at 46.6 keV and the smallest (2.2) at 661.7 keV. The detection efficiency decrease at low energies was in a logarithm way, while at high energies the detection efficiency decreased linearly. (authors)
Additional details
Publishing Information
- Journal Title
- Nuclear Techniques
- Journal Volume
- 34
- Journal Issue
- 9
- Journal Page Range
- p. 683-688
- ISSN
- 0253-3219
INIS
- Country of Publication
- China
- Country of Input or Organization
- China
- INIS RN
- 43075678
- Subject category
- S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
- Descriptors DEI
- AUGMENTATION; BERYLLIUM 7; CALIBRATION; CESIUM 137; DETECTION; EFFICIENCY; GAMMA SPECTROMETERS; HIGH-PURITY GE DETECTORS; KEV RANGE 100-1000; KEV RANGE 10-100; LEAD 210; LEAD 214; PERFORMANCE; RADIOACTIVITY; SOILS; SOLIDS; THICKNESS
- Descriptors DEC
- ALKALINE EARTH ISOTOPES; ALPHA DECAY RADIOISOTOPES; BERYLLIUM ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; DAYS LIVING RADIOISOTOPES; DIMENSIONS; ELECTRON CAPTURE RADIOISOTOPES; ENERGY RANGE; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; GE SEMICONDUCTOR DETECTORS; HEAVY NUCLEI; INTERMEDIATE MASS NUCLEI; ISOTOPES; KEV RANGE; LEAD ISOTOPES; LIGHT NUCLEI; MEASURING INSTRUMENTS; MINUTES LIVING RADIOISOTOPES; NUCLEI; ODD-EVEN NUCLEI; RADIATION DETECTORS; RADIOISOTOPES; SEMICONDUCTOR DETECTORS; SPECTROMETERS; YEARS LIVING RADIOISOTOPES
Optional Information
- Notes
- 5 figs., 2 tabs., 15 refs.