Estimation of effective atomic number in the Rayleigh to Compton scattering ratio using different methods

Kurudirek, Murat; Büyükyıldız, Mehmet

doi:10.1016/j.nima.2016.03.029

Cited by 18 publications

(6 citation statements)

References 16 publications

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“…Tán xạ Rayleigh và tán xạ Compton của gamma năng lượng thấp có ứng dụng thực tiễn trong nhiều lĩnh vực như: nghiên cứu sự ăn mòn thành ống, đo mức chất lỏng, mật độ chất lỏng, đánh giá thành phần nguyên tố thông qua việc tính toán số bậc nguyên tử hiệu dụng [1][2][3][4][5] . Các mô hình lý thuyết như phương pháp tham số dạng phi tương đối tính 6 , tham số dạng sử dụng hàm Hartree-Fock tương đối tính 7 , hiệu chỉnh tham số dạng với hàm Hartree-Fock-Slater tương đối tính 8 và phương trình ma trận (SM) 9…”

Section: Mở đầUunclassified

Preliminary Empirical study of the Rayleigh to Compton scattering ratio for elements at gamma energy 59.5 keV using Si(Li) detector

Thanh¹,

Phat²,

Minh³

et al. 2020

Sci. Tech. Dev. J. - Nat. Sci.

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The characteristic parameters of a material relation to photon interactions such as: mass attenuation coefficient, effective atomic number, effective electron density are required to provide essential data in diverse works such as nuclear diagnostic and cancer radiotherapy, industrial irradiation, radiation dosimetry, radiation protection and shielding, analyzing of the concentration of elements and radioactive isotopes. In this paper, the theoretical models such as non-relativistic form factor (NRFF), relativistic form factor (RFF), and modified form factor (MFF) were used to calculate the ratio Rayleigh-Compton for elements with at gamma energy 59.5 keV. The results showed that there was a discrepancy between the theoretical modes at a high atomic number. The mean value of the Rayleigh-Compton ratio depends on the atomic number, which shows the quadratic function of the correlation coefficient R2 = 0.996 as well. Besides, the experimental system was set-up and measured for some targets such as aluminum, copper, and lead at a scattering angle 150o using 241Am source by Si(Li) detector to confirm the theoretical values. The preliminary result showed that there was a good agreement with experimental and theoretical results is lower than 20%. Further investigation will be measured by the samples for more detailed evaluation.

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Section: Mở đầUunclassified

Preliminary Empirical study of the Rayleigh to Compton scattering ratio for elements at gamma energy 59.5 keV using Si(Li) detector

Thanh¹,

Phat²,

Minh³

et al. 2020

Sci. Tech. Dev. J. - Nat. Sci.

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show abstract

“…In consequence, the ratio between Compton and Rayleigh bands can be used to assess the total chemical composition of a sample through the determination of its Z eff. 11–18 For samples with known elemental composition, Z eff can be calculated theoretically by different mathematical methods 19,20 . However, for complex matrices, Z eff is typically calculated through a calibration curve, built on reference materials with known elemental composition.…”

Section: Introductionmentioning

confidence: 99%

Analytical performance of Compton/Rayleigh signal ratio by total reflection X‐ray fluorescence (TXRF): A potential methodological tool for sample differentiation

et al. 2021

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The high sensitivity Compton and Rayleigh X‐ray scattering signals can be used to gain valuable information on the chemical composition of various matrices, by exploiting the ratio of those signals as a function of the effective atomic number (Zeff). Neither total reflection X‐ray fluorescence (TXRF) nor the effect of the experimental setup, including sample preparation, X‐ray excitation source selection, and band deconvolution procedure, has been assessed in this kind of approach. Here, a Compton/Rayleigh ratio and Zeff‐based TXRF method was set up and tested as an analytical tool for milk samples differentiation. The method was developed using a 90° scattering angle and assessed using different X‐ray excitation sources: a molybdenum tube (Mo Kα 17.5 KeV) and a tungsten tube (W Lα 8.5 KeV and W‐Brems 35 KeV). The evaluation of independent Compton and Rayleigh signals was performed by non‐Gaussian and Gaussian curve resolution methods, and both height and area‐based calculations were evaluated. Different sample preparation conditions were assessed. By using 11 standard materials, a calibration curve for Compton/Rayleigh ratio versus Zeff was established. The method was tested to determine the Zeff of milk samples, which enabled its use as a parameter to differentiate them. Good precisions were obtained with the Mo excitation source and the area‐based calculations, which allowed to differentiate undiluted milk samples by species, treatment, and fat content according to their Compton/Rayleigh ratio. This simple and rapid method has the potential to be used for the differentiation of various types of samples, including liquids, solids, and aerosols.

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“…The corrections are significant in value and make it difficult to rigorously determine the accuracy of measurement results. In previous studies, for the purpose of determining elements with a small atomic number, absolute measurements of the scattering peaks were replaced by measuring the scattering intensity ratio of their integrated scattering intensities. In this case, the correction of experimental data is reduced to a single correction taking into account the difference in the absorption coefficients of the Compton and Rayleigh scattered photons, which are very close in energy.…”

Section: Introductionmentioning

confidence: 99%

Dependence of the Compton to Rayleigh intensity ratio on the scatterer atomic number in the range of 4(Be) to 31(Ga)

et al. 2019

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Compton to Rayleigh scattering intensity ratios (IC/IR) have been measured using X‐rays with energy 17.44 keV for single‐component materials with atomic number Z from 4 (Be) to 31 (Ga) and binary compounds of stoichiometric composition. The measurements have been performed using two optical schemes: an energy‐dispersive X‐ray fluorescence scheme with a molybdenum secondary target and wavelength‐dispersive X‐ray fluorescence one. The processing of the spectra was carried out by fitting with Pearson VII functions. For single‐component and binary standards, the experimental dependence of the scattering intensity ratio on the atomic number was found to be the same. This confirms the additivity of the contribution of different atoms to the scattering. The dependence has a complex shape but is well described by the theoretical relationship for IC/IR with correction on the difference between Compton and Rayleigh radiation absorption coefficients. Two ranges of atomic number values are defined, in which the effective atomic number Zeff can be determined by the calibration method using this dependence: for Z from 4 to 7 with low error of ΔZeff =±0.15 and for Zeff from 10 to 18 with low error of ΔZeff =±0.69. A change in the shape of the Compton peak and an overestimated value of the of the Compton and Rayleigh peak intensity ratio when passing from a single‐component scatterer (Al or Si) to their oxides Al2O3 or SiO2, respectively, have been revealed.

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Estimation of effective atomic number in the Rayleigh to Compton scattering ratio using different methods

Cited by 18 publications

References 16 publications

Preliminary Empirical study of the Rayleigh to Compton scattering ratio for elements at gamma energy 59.5 keV using Si(Li) detector

Preliminary Empirical study of the Rayleigh to Compton scattering ratio for elements at gamma energy 59.5 keV using Si(Li) detector

Analytical performance of Compton/Rayleigh signal ratio by total reflection X‐ray fluorescence (TXRF): A potential methodological tool for sample differentiation

Dependence of the Compton to Rayleigh intensity ratio on the scatterer atomic number in the range of 4(Be) to 31(Ga)

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