Effective atomic number studies in coconut oil samples using 662 keV gamma rays

2021 ◽  
Author(s):  
P. V. Thulasi ◽  
Antony Joseph ◽  
K. M. Varier
Keyword(s):  
Atomic Number ◽  
Gamma Rays ◽  
Effective Atomic Number ◽  
Coconut Oil

scholarly journals A study of the effective atomic number of SixPb0.7-x(Fe2O3)0.3 ternary alloys for photons

2016 ◽  
Vol 31 (4) ◽  
pp. 327-334
Author(s):  
Mehmet Buyukyildiz ◽  
Murat Kurudirek
Keyword(s):  
Atomic Number ◽  
Gamma Rays ◽  
Interpolation Method ◽  
Effective Atomic Number ◽  
Polynomial Equation ◽  
Ternary Alloys ◽  
Photon Scattering ◽  
Photon Attenuation ◽  
Scattering Ratio ◽  
First Time

The effective atomic number (Zeff) of SixPb0.7-x(Fe2O3)0.3 ternary alloys was obtained for photons. Rayleigh to Compton scattering ratio (R/C) has been determined to obtain the Zeff of SixPb0.7-x(Fe2O3)0.3 ternary alloys of varying Si and Pb (10 %-60 %) content for scattering of 59.54 keV g-rays at an angle of 130?. The theoretical R/C ratios of elements were plotted as a function of the atomic number and fitted to a polynomial equation. Experimental R/C values of alloys were then used to obtain Zeff using this fit equation. Also, Zeff values of these alloys were determined for the first time by interpolating the R/C of the material using the R/C data of adjacent elements in between the R/C of the alloy lies. The agreement between the interpolation method and the fit equation was quite satisfactory. The obtained Zeff for photon scattering were then compared to the Zeff for total photon attenuation obtained using the Auto-Zeff program. Significant variations were observed between the Zeff for scattering and the total attenuation of gamma rays.

scholarly journals Measurement of effective atomic number of gunshot residues using scattering of gamma rays

2014 ◽  
Vol 102 ◽  
pp. 68-71 ◽  
Author(s):  
Demet Yılmaz ◽  
Ahmet Turşucu ◽  
Zeynep Uzunoğlu ◽  
Demet Korucu
Keyword(s):  
Atomic Number ◽  
Gamma Rays ◽  
Effective Atomic Number ◽  
Gunshot Residues

Material Identification in Presence of Metal for Baggage Screening

2020 ◽  
Vol 2020 (14) ◽  
pp. 294-1-294-8
Author(s):  
Sandamali Devadithya ◽  
David Castañón
Keyword(s):  
Atomic Number ◽  
Effective Atomic Number ◽  
Simulated Data ◽  
Dual Energy ◽  
Basis Functions ◽  
Total Variation Regularization ◽  
Ct Scanner ◽  
Edge Preserving ◽  
Baggage Screening ◽  
Dual Energy Imaging

Dual-energy imaging has emerged as a superior way to recognize materials in X-ray computed tomography. To estimate material properties such as effective atomic number and density, one often generates images in terms of basis functions. This requires decomposition of the dual-energy sinograms into basis sinograms, and subsequently reconstructing the basis images. However, the presence of metal can distort the reconstructed images. In this paper we investigate how photoelectric and Compton basis functions, and synthesized monochromatic basis (SMB) functions behave in the presence of metal and its effect on estimation of effective atomic number and density. Our results indicate that SMB functions, along with edge-preserving total variation regularization, show promise for improved material estimation in the presence of metal. The results are demonstrated using both simulated data as well as data collected from a dualenergy medical CT scanner.

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