Tables of X-ray mass attenuation coefficients and mass energy absorption. LevringWinXCom—a program for calculating X-ray attenuation coefficients.

Abstract The mass attenuation coefficients for compounds of biomedically important some elements (Na, Mg, Al, Ca, and Fe) have been measured by using an extremely narrow collimated-beam transmission method in the energy 59.5 keV. Total electronic, atomic, and molecular cross sections, effective atomic numbers, and electron densities have been obtained by using these results. Gamma-rays of 241Am passed through compounds have been detected by a high-resolution Si(Li) detector and by using energy dispersive X-ray fluorescence spectrometer (EDXRF).

Obtained results have been compared with theoretically calculated values of WinXCom and FFAST. The relative difference between the experimental and theoretical values are −9.4% to +11.9% with WinXCom and −11.8% to +11.7% FFAST. Results have been presented and discussed in this paper.

NIST Standard Reference Database 126 Last Update to Data Content: July 2004 NISTIR 5632 DOI: Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients from 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest* J. Happy birthday to you my dear lucky name tone mp3 song free. Hubbell + and Radiation Physics Division, PML, NIST © 1989, 1990, 1996 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

NIST reserves the right to charge for these data in the future. Abstract Tables and graphs of the photon mass attenuation coefficient μ/ ρ and the mass energy-absorption coefficient μ en/ ρ are presented for all of the elements Z = 1 to 92, and for 48 compounds and mixtures of radiological interest. The tables cover energies of the photon (x-ray, gamma ray, bremsstrahlung) from 1 keV to 20 MeV. The μ/ ρ values are taken from the current photon interaction database at the National Institute of Standards and Technology, and the μ en/ ρ values are based on the new calculations by Seltzer described in Radiation Research 136, 147 (1993).

These tables of μ/ ρ and μ en/ ρ replace and extend the tables given by Hubbell in the International Journal of Applied Radiation and Isotopes 33, 1269 (1982). Table of Contents • • Material constants for elemental media.

Material constants and composition for compounds and mixtures. Values of the mass attenuation coefficient and the mass energy-absorption coefficient as a function of photon energy, for: [Data] elemental media. [Data] compounds and mixtures. • • • *Work supported by the of NIST. +Work carried out for NIST under contract 43NANB412756. NIST Standard Reference Database 126  Online: May 1996  Last update: July 2004.

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