The effect of source chemical composition on the self-attenuation corrections for low-energy gamma-rays in soil samples

González, J. Carrazana; Díaz, N. Cornejo; Vargas, M. Jurado; Ferrera, E. Capote

doi:10.1016/j.apradiso.2009.10.013

Cited by 15 publications

(1 citation statement)

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“…A literature survey shows that most studies estimate the attenuation coefficients in soil and sediments semi-empirically using an experimental method [8,9,[14][15][16] or theoretically using Monte Carlo computation techniques. [17][18][19][20][21] To our knowledge, no efforts have been made to determine self-attenuation coefficients in scales generated from the petroleum industry.…”

Section: Introductionmentioning

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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