Total interaction cross sections and effective atomic numbers of some biologically important compounds containing H, C, N and O in the energy range 6.4–136 keV

Manjunathaguru, V. and Umesh, T. K. (2007) Total interaction cross sections and effective atomic numbers of some biologically important compounds containing H, C, N and O in the energy range 6.4–136 keV. Journal of Physics B: Atomic, Molecular and Optical Physics, 40 (18). pp. 3707-3718. ISSN 1361-6455

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Abstract

The total interaction cross sections ( sigma(t)) of some sugars and amino acids and five elements: lithium, carbon, oxygen, aluminium and calcium have been measured for 6.4 keV, 13.95 keV, 14.4 keV, 17.74 keV, 24.14 keV, 30.8 keV, 35 keV, 59.54 keV, 81 keV, 122 keV and 136 keV photons in a narrow beam good geometry set up, by using high resolution detectors such as a Si- PIN diode detector and a high purity germanium detector. The st values have been used in a matrix method to evaluate the effective atomic numbers Z(eff) of the samples from their effective atomic cross sections sa. The effective atomic cross section of a sample sa is the total interaction cross section divided by the total number of atoms of all types in it. Further, a quantity called the effective atomic weight A(eff) of a sample was defined as the ratio of the molecular weight A to the total number of atoms of all types in it. The variation of Zeff was systematically studied with respect to Aeff as well as sa at each experimental energy separately and new semi- empirical relations for Zeff have been evolved. It is felt that these relations can be very convenient for determining the effective atomic number of any sample having H, C, N and O atoms in the energy range 6.4 keV 136 keV irrespective of its chemical structure.

Item Type:	Article
Subjects:	D Physical Science > Physics
Divisions:	Department of > Physics
Depositing User:	C Swapna Library Assistant
Date Deposited:	07 Sep 2019 09:53
Last Modified:	07 Sep 2019 09:53
URI:	http://eprints.uni-mysore.ac.in/id/eprint/7768

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