期刊
APPLIED RADIATION AND ISOTOPES
卷 66, 期 10, 页码 1387-1391出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2008.04.012
关键词
X-ray; mass attenuation; mass thickness; equivalent energy; Monte Carlo; EGSnrc
A method using X-rays to measure mass thickness is discussed. The method utilizes a filter to absorb low energy and characteristic photons so that the hardened X-ray spectra have a peaked energy distribution. An equivalent X-ray energy, which defines the attenuation in a material of interest can be used. The effect on the X-ray spectra of different filters is examined with Monte Carlo simulation using the EGSnrc package. A theoretical model for X-ray absorption that shows that the method can achieve good precision for a certain range of mass thicknesses is advanced. Experimental results agree well with the theoretical analysis. It is found that for a certain range of mass thicknesses, the relative error can be less than 1% for the aluminum alloy sample at the tube voltage of 30 or 45 kV. (c) 2008 Elsevier Ltd. All rights reserved.
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