Experimental evaluation of the variation of gamma-ray self-attenuation correction factor with gamma energy and geometry of analytical sample

Gyamfi, K.; Nyarko, B.J.B.; Bamford, S.; Gyampo, O.; Ampomah-Amoako, Emmanuel

doi:10.5355/jast.2012.160

Cited by 2 publications

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“…[34] The results were in agreement to those reported in the literature where linear-attenuation coefficients decrease with increasing c-ray energy for a given density and geometry. [35,36] CONCLUSIONS Self-attenuation correction factors and linear-attenuation coefficients were determined for scale waste samples that were produced from the maintenance of NORM contaminated equipment. This was performed by the transmission method using 152 Eu point source.…”

Section: Linear-attenuation Coefficients Of Scale Samplesmentioning

confidence: 99%

Evaluation of Self-Attenuation Coefficients of Oil-Produced Scales for Gamma-Ray Spectroscopic Analysis

Attar

Abdullah

Doubal

et al. 2014

Instrumentation Science & Technology

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& This study focuses on the evaluation of self-attenuation correction factors (C f ) and linearÀ attenuation coefficients (l) of scale samples, produced from the oil fields. This was performed using 152 Eu point source at the optimal geometry found (i.e., 3 mm). The scale samples were of apparent density ranging 1.04 À 3.08 g cm À3 . The results illustrated that self-attenuation correction values were as high as 5.08 for the most dense samples at c-energy line of 45.5 keV. High correlation was observed by Pearson matrix between self-attenuation correction factor and sample density (correlation coefficient of 0.967 at c-energy of 45.5 keV). A simplified model of the relationship between these variables was proposed. The remarkable finding was that when scale sample density increased self-absorption extended to occur to a higher energy line. Hence, self-attenuation correction was negligible at c-energies of 122, 222, and 344 keV for samples with density ranging 1.04-1.41, 1.45-2.04, and 2.12-3.08 g cm À3 , respectively. Since linear attenuation coefficient is material sensitive, it was calculated for each sample. Analysis of variance (ANOVA) reflected the linear relationship between linear-attenuation coefficient and sample density up to 344 keV which disappeared thereafter. The data obtained allowed an accurate determination of the concentrations of c-emitters in scale samples within the energy range of 45.5-1408 keV.

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Section: Linear-attenuation Coefficients Of Scale Samplesmentioning

confidence: 99%

Evaluation of Self-Attenuation Coefficients of Oil-Produced Scales for Gamma-Ray Spectroscopic Analysis

Attar

Abdullah

Doubal

et al. 2014

Instrumentation Science & Technology

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“…Thus, Ghana Research Reactor-1 operates at a half-power of 15 kW with 5.0 ×10 11 cm 2 .s as a corresponding thermal neutron flux [2]. The technique relies on high thermal neutrons flux and large cross-sections for (n,γ) reactions to provide good analytical sensitivity [1,5]. Over the few decades, numerous laboratories worldwide have applied the k0standardization method of INAA (k0-INAA) to suit the comparative procedures for quantifying analytes, which is considered the conventional quantitation method for INAA [7].…”

Section: Introductionmentioning

confidence: 99%

Validation of k0-Standardization Procedure of Instrumental Neutron Activation Analysis at Ghana Research Reactor-1 Facility for the Determination of Rare Earth Elements

Asare

Klutse

Acquaye

2022

Arab Journal of Nuclear Sciences and Applications

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The current approach for accurate determination for rare earth elements using environmental reference materials for k0-INAA with short turnaround analysis times was investigated. The k0 and Q0 values for REEs, nuclear interference, and spectral interference were practically assessed and improved with the standard reference material. The evaluation of the current iterative neutron self-shielding and gamma-ray self-attenuation was established using reference material prepared from 100 mg/kg of 99.9% certified reference material (i.e., Alfa Aesar mono rare earth oxide combined with SiO2). The general achievement of the current k0-INAA technique for rare earth elements was validated with IAEA Soil-7 reference material and real sediment samples. The rare earth elements levels in the reference material range from 0.72 ± 0.08 mg/kg for 166 Ho to 60.8 ± 2.1 mg/kg for 141 Ce. The uncertainty at which the rare earth element concentration was examined is below 8% (at 95% confidence level). This showed good uniformity with the IAEA Soil-7 certified contents. In addition, k0-NAA is able to quantify most of the REEs in real samples collected from three locations in Ghana.

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Experimental evaluation of the variation of gamma-ray self-attenuation correction factor with gamma energy and geometry of analytical sample

Cited by 2 publications

References 0 publications

Evaluation of Self-Attenuation Coefficients of Oil-Produced Scales for Gamma-Ray Spectroscopic Analysis

Evaluation of Self-Attenuation Coefficients of Oil-Produced Scales for Gamma-Ray Spectroscopic Analysis

Validation of k0-Standardization Procedure of Instrumental Neutron Activation Analysis at Ghana Research Reactor-1 Facility for the Determination of Rare Earth Elements

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