Effect of sample thickness on the measured mass attenuation coefficients of some compounds and elements for 59.54, 661.6 and 1332.5 keV γ-rays

Abdel-Rahman, M. A.; Badawi, Emad A.; Abdel-Hady, Y.L; Kamel, N.A.

doi:10.1016/s0168-9002(99)01257-7

Cited by 45 publications

(22 citation statements)

References 15 publications

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“…The later has great importance when changes in photopeak position occur. The higher CV values obtained for the other samples can also be associated to impurities of the materials, to the dimensions of the samples used for the determination of the attenuation coefficients, also to the long total time for complete CT scan, and to artifacts in the tomographic images [1,15,17]. …”

Section: Resultsmentioning

confidence: 99%

Representative Gamma-ray Computed Tomography Calibration for Applications in Soil Physics

et al. 2011

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Tomographic image quality in soil physics applications is extremely dependent on calibration. Here, good calibrations of the system are necessary to avoid errors during soil evaluations by computed tomography (CT), which can hamper interpretations of physical parameters of the soil. In order to analyze the relevance of a good calibration curve (CC) for measurements of soil physical properties, determinations of soil bulk density (ρ b ) were obtained using four different CCs established for a homemade CT scanner dedicated especially to soil physics. The calibrations of the system were obtained through the relationship between tomographic units and corresponding linear attenuation coefficients (μ 1 ) of different materials. Data show that different calibration curves produce distinct ρ b values affecting the quality of results of this soil physical property when evaluated by CT. However, it was demonstrated that even using non-homogeneous materials for CT calibration the results of ρ b practically are of the same order of magnitude of the whole system error estimated in 0.05 g cm −3 (taking the water as reference).

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Section: Resultsmentioning

confidence: 99%

Representative Gamma-ray Computed Tomography Calibration for Applications in Soil Physics

et al. 2011

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“…In the present work, we have calculated mass attenuation coefficients for some polymers (see in Table 1) using simulation geometry method with MCNP-4C code with the objective to test the simulation geometry method to provide the radiation safety. Firstly, mass attenuation coefficients were calculated for the polymers, and results were compared with XCOM program and experimental data from literature [15][16][17][18][19][20][21][22].The mass attenuation coefficients for water were determined, and compared with experimental data, theoretical XCOM [12] and FLUKA simulation reported by Demir et al [23]. At present the experimental values of mass attenuation coefficient for very few polymers are available for limited photon energies.…”

Section: Recently Photon Interaction With Polymers Wax and Plastics mentioning

confidence: 99%

“…For investigating the variation of parameters in depth, the experimental results from literature [15][16][17][18][19][20][21][22]. Simulations were performed with 200000 histories.…”

Section: Recently Photon Interaction With Polymers Wax and Plastics mentioning

confidence: 99%

Determination of mass attenuation coefficient for some polymers using Monte Carlo simulation

Singh

Shirmardi²,

Medhat

et al. 2015

Vacuum

120

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“…material density, elemental composition, sample thickness, and the energy of the gamma-rays. [9,11,12] One method to correct this effect is to calibrate the detector using spiked or reference materials that match the sample type. This method requires homogeneity tests which is too costly and time-consuming for laboratories that measure a wide variety of sample matrices.…”

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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Effect of sample thickness on the measured mass attenuation coefficients of some compounds and elements for 59.54, 661.6 and 1332.5 keV γ-rays

Cited by 45 publications

References 15 publications

Representative Gamma-ray Computed Tomography Calibration for Applications in Soil Physics

Representative Gamma-ray Computed Tomography Calibration for Applications in Soil Physics

Determination of mass attenuation coefficient for some polymers using Monte Carlo simulation

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

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