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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of the effective energy of primary and transmmitted workload weighted X-ray spectra

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Author(s):
Santos, J. C. [1] ; Costa, P. R. [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Inst Fis, Dept Fis Nucl, BR-05508090 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Radiation Physics and Chemistry; v. 95, p. 221-223, FEB 2014.
Web of Science Citations: 5
Abstract

Current methods for X-ray shielding evaluation for imaging facilities do not take into account the effective energy of the radiation impinging on primary barrier. In addition, the X-ray beam attenuation through the patient is not considered in radiation shielding. The proposed models do not deal with the hardening of the spectra between the primary and transmitted beams. Therefore, the present work proposes the evaluation of X-ray spectra transmitted by an adult patient (anthropomorphic phantom) and a shielding barrier weighted by typical workload distributions. A set of primary spectra produced by a voltage range from 60 to 140 kV was measured with a CdTe spectrometer system. A second set of X-ray spectra transmitted through a 15 mm thickness barite mortar plate was also measured employing the same beam quality and voltage range. The air-kerma was simultaneously measured using an ionization chamber. The primary and transmitted experimental X-ray spectra were weighted by a typical chest examination workload distribution. The resulting weighted spectra represent the superposition of the radiation beams typically used in chest examinations. The effective energy of primary weighted spectra was estimated in 42.4 keV and the effective energy of the corresponding transmitted spectra was estimated in 64.7 keV. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/04721-9 - Experimental approach for the relation between air-kerma and ambient equivalent dose for shielding calculation of primary barriers of X-ray imaging facilities
Grantee:Josilene Cerqueira Santos
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 10/12237-7 - Experimento evaluation of the relation between air-Kerma and ambient equivalent dose for shielding calculation in adult and pediatric X-ray rooms
Grantee:Paulo Roberto Costa
Support Opportunities: Regular Research Grants