Peak energy shift dependent on source position in γ-ray energy measurement by using a closed-ended coaxial HPGe detector

Bak, Hae-iLL; Bae, Yongjun; Kim, M.S.; Choi, Hyeung-Sik

doi:10.1016/0168-9002(95)00597-8

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…This kind of measurement requires carefully controlled experimental conditions, since the precision to which the centroid of a peak in a spectrum can be localized is dependent on the spectrometer resolution and stability. In addition, it must be noted that the geometrical conditions should be the same for calibration and measurements to avoid the field-increment effect (Shizuma et al 1978, Bak et al 1995. Nevertheless, uncertainties lower than 0.1 keV on the energy are easily obtained under well-controlled conditions.…”

Section: Energy Measurementmentioning

confidence: 99%

Uncertainties in gamma-ray spectrometry

Lépy

Pearce²,

Sima

2015

Metrologia

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High resolution gamma-ray spectrometry is a well-established metrological technique that can be applied to a large number of photon-emitting radionuclides, activity levels and sample shapes and compositions. Three kinds of quantitative information can be derived using this technique: detection efficiency calibration, radionuclide activity and photon emission intensities. In contrast to other radionuclide measurement techniques gamma-ray spectrometry provides unambiguous identification of gamma-ray emitting radionuclides in addition to activity values. This extra information comes at a cost of increased complexity and inherently higher uncertainties when compared with other secondary techniques. The relative combined standard uncertainty associated with any result obtained by gamma-ray spectrometry depends not only on the uncertainties of the main input parameters but also on different correction factors. To reduce the uncertainties, the experimental conditions must be optimized in terms of the signal processing electronics and the physical parameters of the measured sample should be accurately characterized. Measurement results and detailed examination of the associated uncertainties are presented with a specific focus on the efficiency calibration, peak area determination and correction factors. It must be noted that some of the input values used in quantitative analysis calculation can be correlated, which should be taken into account in fitting procedures or calculation of the uncertainties associated with quantitative results. It is shown that relative combined standard uncertainties are rarely lower than 1% in gamma-ray spectrometry measurements.

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Section: Energy Measurementmentioning

confidence: 99%

Uncertainties in gamma-ray spectrometry

Lépy

Pearce²,

Sima

2015

Metrologia

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“…High Purity Germanium (HPGe) detectors are used for γ-ray detection and spectroscopy in nuclear physics experiments, including low radioactive background detector systems, such as the proposed Majorana experiment [1]. Others have shown and explained how a detected spectrum shape can vary noticeably based on the position of a γ-emitting radiation source relative to the detector [2,3,4,5]. We show that the Kolmogorov-Smirnov (K-S) test is sensitive to these changes as well.…”

Section: Introductionmentioning

confidence: 90%

“…Others have shown and explained how a detected spectrum shape can vary noticeably based on the position of a γ-emitting radiation source relative to the detector [2,3,4,5]. We show that the Kolmogorov-Smirnov (K-S) test is sensitive to these changes as well.…”

Section: Introductionmentioning

confidence: 93%

Reconstruction of a radiation point source’s radial location using goodness-of-fit test on spectra obtained from an HPGe detector

Evans

Andre

et al. 2009

Nuclear Instruments and Methods in Physics Research Section B:

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High purity germanium (HPGe) detectors are ubiquitous in nuclear physics experiments and are also used in numerous low radioactive background detectors. The effect of the position of 60 Co and 137 Cs point sources on the shape of spectra were studied with Monte Carlo and HPGe detector measurements. We briefly confirm previous work on the position dependence of relative heights of peaks. Spectra taken with the radiation sources placed at locations around the detector were then compared using the Kolmogorov-Smirnov (K-S) goodness-of-fit test. We demonstrate that with this method the Compton continuum spectral shape has good sensitivity to the radial location of a point-source, but poor angular resolution. We conclude with a study of the position reconstruction accuracy as a function of the number of counts from the source.

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