Effective atomic number and electron density of amino acids within the energy range of 0.122–1.330 MeV

Photon attenuation coefficient calculation methods have been widely used to accurately study the properties of amino acids such as n-acetyl-l-tryptophan, n-acetyl-l-tyrosine, d-tryptophan, n-acetyl-l-glutamic acid, d-phenylalanine, and d-threonine. In this study, mass attenuation coefficients ( mu s...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2016-08, Vol.125, p.14-20
Main Authors: More, Chaitali V., Lokhande, Rajkumar M., Pawar, Pravina P.
Format: Article
Language:English
Subjects:
Amino acids
Atomic properties
Attenuation coefficients
Constants
Cross sections
Electron density
Mathematical analysis
Photons
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Summary:Photon attenuation coefficient calculation methods have been widely used to accurately study the properties of amino acids such as n-acetyl-l-tryptophan, n-acetyl-l-tyrosine, d-tryptophan, n-acetyl-l-glutamic acid, d-phenylalanine, and d-threonine. In this study, mass attenuation coefficients ( mu sub(m)) of these amino acids for 0.122-, 0.356-, 0.511-, 0.662-, 0.884-, 1.170, 1.275-, 1.330-MeV photons are determined using the radio-nuclides Co super(57), Ba super(133), Cs super(137), Na super(22), Mn super(54), and Co super(60). NaI (Tl) scintillation detection system was used to detect gamma rays with a resolution of 8.2% at 0.662 MeV. The calculated attenuation coefficient values were then used to determine total atomic cross sections ( sigma sub(t)), molar extinction coefficients ( epsilon ), electronic cross sections ( sigma sub(e)), effective atomic numbers (Z sub(eff)), and effective electron densities (N sub(eff)) of the amino acids. Theoretical values were calculated based on the XCOM data. Theoretical and experimental values are found to be in a good agreement (error
ISSN:0969-806X
DOI:10.1016/j.radphyschem.2016.02.024