Experimental approach for the relation between air-kerma and ambient equivalent dose for shielding calculation of primary barriers of X-ray imaging facilities

• Grant number: 11/04721-9
• Support Opportunities: Scholarships in Brazil - Master
• Start date: August 01, 2011
• End date: March 31, 2013
• Field of knowledge: Engineering - Biomedical Engineering - Medical Engineering
• Principal Investigator: Paulo Roberto Costa
• Grantee: Josilene Cerqueira Santos
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The present MSc program has for objective the experimental study of the relations between air-kerma and the operational quantity ambient dose equivalent, through the measurement of the spectral beam fluence of transmitted rays X through materials used in radiological rooms. For this, an experimental methodology based on X-ray spectroscopy techniques will be developed, with the purpose of validating mathematical models previously introduced by the supervisor of the proponent student. The final product will be composed by a set of operational procedures for shielding calculations and radiometric surveys that take in consideration the spectral behavior of X-ray beams transmitted by primary barriers typically used during radiological procedures. These procedures will incorporate in its estimates of the quantity ambient dose equivalent, conversion factors between the air-kerma and this quantity that take in consideration the spectral changes due to the penetration of the primary spectra in phantoms and to different attenuating materials found in Brazilian market. The objectives to be reached during the project are the determination of the X-ray beam qualities following the IAEA code of practice, the application of methods of spectroscopy for determination of properties of primary protective barriers, the calculation of conversion factors between air-kerma and ambient dose equivalent, and the validation and analysis of uncertainties of the results. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SANTOS, J. C.; MARIANO, L.; TOMAL, A.; COSTA, P. R.. Evaluation of conversion coefficients relating air-kerma to H-star(10) using primary and transmitted x-ray spectra in the diagnostic radiology energy range. JOURNAL OF RADIOLOGICAL PROTECTION, v. 36, n. 1, p. 117-132, MAR 2016. (11/04721-9, 10/12237-7)

GONZALES, A. H. LOPEZ; SANTOS, J. C.; MARIANO, L.; TOMAL, A.; COSTA, P. R.. Evaluation of mean conversion coefficients from air-kerma to H{*}(10) using secondary and transmitted x-ray spectra in the diagnostic radiology energy range. JOURNAL OF RADIOLOGICAL PROTECTION, v. 36, n. 4, p. 842-857, DEC 2016. (11/04721-9, 10/12237-7)

SANTOS, JOSILENE C.; TOMAL, ALESSANDRA; MARIANO, LEANDRO; COSTA, PAULO R.. Application of a semi-empirical model for the evaluation of transmission properties of barite mortar. Applied Radiation and Isotopes, v. 100, p. 38-42, JUN 2015. (11/04721-9, 10/12237-7)

SANTOS, J. C.; COSTA, P. R.. Evaluation of the effective energy of primary and transmmitted workload weighted X-ray spectra. Radiation Physics and Chemistry, v. 95, p. 221-223, FEB 2014. (11/04721-9, 10/12237-7)

GONZALES, A. H. LOPEZ; SANTOS, J. C.; MARIANO, L.; TOMAL, A.; COSTA, P. R.. Evaluation of mean conversion coefficients from air-kerma to H*(10) using secondary and transmitted x-ray spectra in the diagnostic radiology energy range. JOURNAL OF RADIOLOGICAL PROTECTION, v. 36, n. 4, p. 16-pg., 2016-12-01. (10/12237-7, 11/04721-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SANTOS, Josilene Cerqueira. Experimental study of the relationship between air Kerma and ambient dose equivalent for the calculation of primary radiological barriers in rooms.. 2013. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Física (IF/SBI) São Paulo.