Studies on effective atomic numbers and electron densities of nucleobases in DNA

被引：17

作者：

Kumar, Ashok ^{[1
]}

机构：

[1] Punjabi Univ, Coll Engn & Management, Neighbourhood Campus, Rampura Phul, Punjab, India

来源：

RADIATION PHYSICS AND CHEMISTRY | 2016年 / 127卷

关键词：

Mass attenuation coefficients; Effective atomic number; Electron density; Nucleobases; MASS ATTENUATION COEFFICIENTS; PHOTON INTERACTIONS; HUMAN TISSUES; ABSORPTION; SCATTERING; SUPERCONDUCTOR; TABULATION; DEPENDENCE; ENERGIES; ALLOYS;

D O I：

10.1016/j.radphyschem.2016.06.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Various parameters of dosimetric importance such as effective atomic numbers (Z(eff)) and electron densities (N-el) of nucleobases in DNA have been calculated for the total and partial photon interaction processes in the wide energy range of 1 keV-100 GeV. The variations of Z(eff) and N-el with energy are shown graphically for all partial and total interaction processes and are found to be similar. Up to 10 keV, Z(eff) and N-el show a sharp increase for cytosine-guanine and thymine-adenine whereas for all the other nucleobases, it is almost constant. Then there is sharp decrease in Z(eff) and N-el with energy up to 100 keV for all the nucleobases. From 100 keV to 6 MeV, Z(eff) and N-el are almost independent of energy. From 6 MeV to 100 MeV, there is regular increase in Z(eff) and N-el with photon energy. Above 400 MeV, Z(eff) and N-el remain almost constant. The obtained results are due to the dominance of photoelectric absorption, Compton scattering and pair production in different energy regions as respectively stated above and their dependences on the chemical compositions of the interacting media. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：48 / 55

页数：8

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