Determination of selenium in environmental standard reference materials by a .gamma.-.gamma. coincidence method using lithium-drifted germanium detectors

Wangen, L.E.; Gladney, Ernest S.; Starner, John W.; Hensley, W.K.

doi:10.1021/ac50054a037

Cited by 19 publications

(6 citation statements)

References 25 publications

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“…For this reason, the use of coincidence has been demonstrated to significantly reduce background counts [5]. The use of gamma-gamma coincidence produces a count reduction of 3 to 4 magnitudes when measuring selenium ( 75 Se) in environmental standards using neutron activation analysis [6]. Gamma-gamma * cegozi@utexas.edu coincidence counting allows for lower detection limits, particularly in conjunction with the use of energy gating.…”

Section: Introductionmentioning

confidence: 99%

A PRELIMINARY INVESTIGATION FOR THE USE OF DIGITAL GAMMA-GAMMA COINCIDENCE SPECTROMETRY TO DETECT <sup>239</sup>Pu

Egozi¹,

Martínez²,

Luna³

et al. 2021

RAD Conference Proceedings

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Gamma-ray spectrometry is one of the most effective ways to determine the activity of 239 Pu, depending on activity levels. However, often high backgrounds in complex spectra with low amounts of 239 Pu can increase detection limits. The effectiveness of the use of gamma-gamma spectrometry in the characterization of 239 Pu is studied for the first time. Using the XIA Pixie-16 digital pulse processor, gamma-gamma coincidences were measured to study the unshielded background radiation as a function of the source to detector distance, and gating of several gamma-rays from 239 Pu. The Poisson distribution of the acquired pulses has been also verified. In addition, measurements demonstrated that the background radiation is strongly reduced, meaning gamma-gamma spectroscopy can be very effective to avoid the usual lead shielding. Other measurements were taken to assure Poisson statistics were attained in the digital system. Preliminary measurements revealed 3 orders of magnitude background reduction for the measurement of 239 Pu using gated gamma-rays.

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Section: Introductionmentioning

confidence: 99%

A PRELIMINARY INVESTIGATION FOR THE USE OF DIGITAL GAMMA-GAMMA COINCIDENCE SPECTROMETRY TO DETECT <sup>239</sup>Pu

Egozi¹,

Martínez²,

Luna³

et al. 2021

RAD Conference Proceedings

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“…The gamma-gamma coincidence method is mainly applied for experimental studies of the nuclear structure. Thanks to its ability to reduce the gamma rays background and the selection of events correlation in timing, these methods have been used for NAA [2][3][4][5]. Lawrence E. Wangen et al have used a coincidence method using Ge(Li) Detectors to evaluate Se detection limits and background reductions for Normal and Coincidence counting procedures [2].…”

Section: Introductionmentioning

confidence: 99%

Determination of selenium in environmental sample by gammagamma Coincidence method

Huu¹,

Nguyen²,

Nguyễn³

et al. 2015

Third International Conference on Advances in Applied Science and Environmental Engineering - ASEE 2015

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Selenium (Se) is considered an essential trace element, it plays a role in thyroid function and your immune system which needs Se to work properly. Se is widely distributed in the environment, so the quantifying Se in the environmental samples are very important and essential to study transferring factor. The advantage of coincidence method is abilities of background reduction and removal of interference evaluated for the analysis of geological samples [1]. In this paper, we would like to present determination of the results of Se in environmental sample by neutron activation analysis combined with the gamma-gamma coincidence method. By application of this method, the peak to background ratios, detection limits of Se in environmental samples were improved and concentration of Se in sample was determined.

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“…Many analyses have been performed on NBS coal and ash standards to demonstrate the applicability of INAA to the analysis of these types of samples (59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72)(73)(74). Differences in matrix between samples and standards are not important because only the nuclear properties of the elements are involved in the analyses (60).…”

Section: Photographic Detectionmentioning

confidence: 99%

“…Differences in matrix between samples and standards are not important because only the nuclear properties of the elements are involved in the analyses (60). The coincidence of gamma-rays emitted by certain elements and their measurement by dual detectors has been used to improve the sensitivity of the method for some elements (65 Fluorimetric methods have been used for the analysis of selenium (80) and uranium (161-163). Precisions and accuracies are generally as good as or better than ±10%.…”

Section: Photographic Detectionmentioning

confidence: 99%

Improvement in the analysis of ashes from coal by spark source mass spectrography

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Determination of selenium in environmental standard reference materials by a .gamma.-.gamma. coincidence method using lithium-drifted germanium detectors

Cited by 19 publications

References 25 publications

A PRELIMINARY INVESTIGATION FOR THE USE OF DIGITAL GAMMA-GAMMA COINCIDENCE SPECTROMETRY TO DETECT <sup>239</sup>Pu

A PRELIMINARY INVESTIGATION FOR THE USE OF DIGITAL GAMMA-GAMMA COINCIDENCE SPECTROMETRY TO DETECT <sup>239</sup>Pu

Determination of selenium in environmental sample by gammagamma Coincidence method

Improvement in the analysis of ashes from coal by spark source mass spectrography

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