Performance of HPGe gamma spectrometry system for the measurement of low level radioactivity

Chinnaesakki, S.; Bará, Salvador; Sartandel, S. J.; Tripathi, R.; Puranik, V. D.

doi:10.1007/s10967-011-1607-8

Cited by 16 publications

(6 citation statements)

References 6 publications

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“…In general, as can be observed from Table 1 for spiked water samples the target value of the specific activity in the samples is low, in the order of few Becquerels. This makes the analysis process for these samples very complex, because any variable in the activity formula [4] should be correctly evaluated. Any overestimation/underestimation of any variable, such as net peak area or background subtraction, easily can lead to an overestimation/underestimation of the activity.…”

Section: Resultsmentioning

confidence: 99%

Proficiency test: a quality assurance method for high-purity gamma spectrometry system

Rădulescu

Calin

2014

EPJ Web of Conferences

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Abstract. As part of the implementation of the quality system on ISO 17025 and accreditation, SALROM laboratory participated in the last year in intercomparison exercises, national and international, for determination of natural and man-made radionuclides. This paper describes results obtained in intercomparison exercise organized by IAEA in 2011. The reported values were mostly in good agreement with the resulting reference values.

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Section: Resultsmentioning

confidence: 99%

Proficiency test: a quality assurance method for high-purity gamma spectrometry system

Rădulescu

Calin

2014

EPJ Web of Conferences

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“…The two composite samples were prepared for gamma-ray spectrometric analysis by the high purity germanium detector (HPGe). This high resolution gamma-ray spectrometry system is widely used for radioactivity analysis because of its superior energy resolution with the availability of large size crystal (Chinnaesakki et al, 2012). The used detector was closed-end coaxial (n-type) made of high purity germanium (HPGe) in a vertical configuration cooled with liquid nitrogen.…”

Section: Methodsmentioning

confidence: 99%

Occurrence of Carnotite in the Phosphatic horizon of the Sudr Chalk, Wadi El-Quseiyib, East Central Sinai, Egypt: Paleoenvironmental and Radioactivity Implications

Gheith

Sankary

Anan

et al. 2018

Journal of Environmental Sciences. Mansoura University

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Anomalous uranium contents were recognized in the phosphatic beds of the Campanian-Maastrichtian Sudr Chalk of Wadi El-Quseiyib at the East Central Sinai. Microscopic examination, and scanning electron microscopy revealed the presence of carnotite patches disseminated in the studied Sudr Chalk phosphatic rocks. This mineral is recorded for the first time in the east central Sinai and it may be significant in discussing uranium prospection and the origin of secondary uranium deposits. The identification of this mineral directed the attention to study the natural radionuclides content which have been measured by gamma-ray spectrometry using a shielded HPGe detector. This study revealed that 238 U and some of its progenies were redistributed after subjection to several alteration processes. Petrographic study of Wadi El-Quseiyib phosphatic rocks revealed that they are consisted mainly of collophane pellets, bone and teeth fragments, which were diagenetically cemented by calcite, gypsum and quartz materials. The studied phosphatic microfacies was described texturally as pelphospharudite and pelphospharenite. X-ray diffraction analysis proved the presence of carbonate fluorapatite (francolite) as the dominant phosphatic mineral, while calcite, gypsum and quartz are the dominant non-phosphatic minerals with minor contents of bassanite and jarosite and siderotil. Averages of P 2 O 5 and uranium contents are 16.7 % and 70 ppm in the analyzed phosphatic rocks, respectively. Carnotite characteristics are identified by SEM/EDX in the studied phosphatic rocks which indicate that the uranium is leached out from the phosphatic materials and re-deposited as fine specks in open pores by circulating meteoric water. The leached uranyl ions together with vanadate ions are forming the identified carnotite under the influence of evaporation. The calculated annual effective dose equivalent values (AEDE) are 0.478 and 0.504 mSv/yr for the lower and upper phosphatic beds, respectively. The calculated radium equivalent activity values of (Ra eq) are 2319 and 2802 Bq/kg for the lower and upper phosphatic beds, respectively. Accordingly, although the estimated (AEDE) to the public is below the recommended limits, but the equivalent radium activity and the expected coincided radon gas emanation renders the phosphatic exposures in the study area classified unsafe for prolonged public activities.

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“…For Gaussian peak, the optimal and acceptable resolution ratio is 1.82, and in practise, it should be less than 1.9. While the ideal and acceptable resolution ratio for FWFM/FWHM for Gaussian peak is 2.38, in practise it should be around 2.5 [15,16].…”

Section: Performance Statistical Analysismentioning

confidence: 99%

“…Energy Resolution Peak width and peak efficiency are indicators of a detector's capacity to produce photon peaks [16]. Resolution is the width specified in keV as the Full Width at Half Maximum (FWHM).…”

Section: Performance Statistical Analysismentioning

confidence: 99%

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Evaluation of HPGe Detector Long Term Performance for Environmental Radioactivity Measurements

abdelaziz

shabasy²,

Hassan

et al. 2022

Egypt. J. Chem.

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A gamma-emitting radionuclide is commonly measured qualitatively and quantitatively using a high-purity germanium (HPGe) detector. The precision of the measurement is determined by the HPGe detectors' performance. In this work, the long-term performance of the HPGe detector in the Central Laboratory for Radioactivity Measurements Intercomparison and Training (CLERMET) is evaluated using statistical analysis. The minimal detectable activity (MDA) and the detection limit (LD) were computed. The Full Energy Peak Efficiency (FEPE) was calculated using a standard mixed gamma solution source and confirmed using samples from the International Atomic Energy Agency (IAEA) (PTs). The acquired data allowed for the determination of the resolution, peak shape, and peak to Compton ratio of the HPGe detector as a function of gamma-ray energy due to the long-term operation. FWHM, FWTM, FWFM and both ratios of FWTM/FWHM and FWFM/FWHM were determined at 1332 keV (60Co). The findings are used to discuss the detector's long-term performance stability. Even after a lengthy time of use, the results reveal that detector performance has no effect on the full energy peak efficiency (FEPE). The laboratory results were in good agreement with the target value based on the IAEA PTs, confirming the laboratory's dependability and traceability. For method validations, Quality Assurance and Quality Control are required to improve the reliability and accuracy of results as well as to demonstrate the laboratory's performance and trustworthiness.Different analytical methods are developed for the determination of uranium isotopes in environmental samples using non-destructive and destructive analysis. Choice of an accurate and precise technique to get better performance and quality is essential for the results assessment and improvement. In this work different methods (Non-destructive method based on gamma spectrometer and destructive methods based on alpha spectrometer) were described to implement routine method for uranium isotopes determination in environmental samples. A set of IAEA reference certified samples were used for method verification.

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Performance of HPGe gamma spectrometry system for the measurement of low level radioactivity

Cited by 16 publications

References 6 publications

Proficiency test: a quality assurance method for high-purity gamma spectrometry system

Proficiency test: a quality assurance method for high-purity gamma spectrometry system

Occurrence of Carnotite in the Phosphatic horizon of the Sudr Chalk, Wadi El-Quseiyib, East Central Sinai, Egypt: Paleoenvironmental and Radioactivity Implications

Evaluation of HPGe Detector Long Term Performance for Environmental Radioactivity Measurements

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