Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1882902 | Radiation Physics and Chemistry | 2016 | 8 Pages |
Abstract
Various parameters of dosimetric importance such as effective atomic numbers (Zeff) and electron densities (Nel) of nucleobases in DNA have been calculated for the total and partial photon interaction processes in the wide energy range of 1Â keV-100Â GeV. The variations of Zeff and Nel with energy are shown graphically for all partial and total interaction processes and are found to be similar. Up to 10Â keV, Zeff and Nel 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 Zeff and Nel with energy up to 100Â keV for all the nucleobases. From 100Â keV to 6Â MeV, Zeff and Nel are almost independent of energy. From 6Â MeV to 100Â MeV, there is regular increase in Zeff and Nel with photon energy. Above 400Â MeV, Zeff and Nel 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Ashok Kumar,