Experimento evaluation of the relation between air-Kerma and ambient equivalent dose for shielding calculation in adult and pediatric X-ray rooms

• Grant number: 10/12237-7
• Support Opportunities: Regular Research Grants
• Start date: January 01, 2011
• End date: December 31, 2013
• Field of knowledge: Engineering - Biomedical Engineering - Medical Engineering
• Principal Investigator: Paulo Roberto Costa
• Grantee: Paulo Roberto Costa
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated researchers: Elisabeth Mateus Yoshimura ; Emico Okuno
• Associated research grant(s): 11/50578-3 - Development of adapdated modules for e-learning training on medical physics and medical engineering, AP.R

Abstract

The present research 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 proponent researcher. 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 adult and pediatrics' 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

(15)

(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)

COSTA, P. R.; VIEIRA, D. V.; NACCACHE, V. K.; FERREIRA, K. R.; PRISZKULNIK, S.. Evaluation of X-ray spectra transmitted by different concrete compositions. Radiation Physics and Chemistry, v. 116, p. 349-354, NOV 2015. (10/12237-7)

SANTOS, JOSILENE C.; TOMAL, ALESSANDRA; DE BARROS, NESTOR; COSTA, PAULO R.. Normalized glandular dose (DgN) coefficients from experimental mammographic x-ray spectra. Physics in Medicine and Biology, v. 64, n. 10, MAY 2019. (13/07117-0, 10/12237-7, 15/21873-8)

FRIMAIO, AUDREW; NASCIMENTO, BRUNA C.; BARRIO, RAMON M. M.; CAMPOS, LETICIA L.; COSTA, PAULO R.. X-ray spectrometry applied for determination of linear attenuation coefficient of tissue-equivalent materials. Radiation Physics and Chemistry, v. 160, p. 89-95, JUL 2019. (17/23034-9, 10/12237-7)

GIANSANTE, LOUISE; MARTINS, JULIANA C.; NERSISSIAN, DENISE Y.; KIERS, KAREN C.; KAY, FERNANDO U.; SAWAMURA, MARCIA V. Y.; LEE, CHOONSIK; GEBRIM, ELOISA M. M. S.; COSTA, PAULO R.. Organ doses evaluation for chest computed tomography procedures with TL dosimeters: Comparison with Monte Carlo simulations. JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS, v. 20, n. 1, p. 308-320, JAN 2019. (13/09596-3, 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)

SANTORO-FERNANDES, V; SANTOS, J. C.; MARIANO, L.; VANIN, V. R.; COSTA, P. R.. Uncertainty estimation and statistical comparative methodology for mammography x-ray energy spectra. BIOMEDICAL PHYSICS & ENGINEERING EXPRESS, v. 6, n. 3, APR 2020. (10/12237-7, 13/07117-0)

SANTOS, JOSILENE C.; TOMAL, ALESSANDRA; FURQUIM, TANIA A.; FAUSTO, AGNES M. F.; NOGUEIRA, MARIA S.; COSTA, PAULO R.. Direct measurement of clinical mammographic x-ray spectra using a CdTe spectrometer. Medical Physics, v. 44, n. 7, p. 3504-3511, JUL 2017. (13/07117-0, 15/21873-8, 10/12237-7)

GABRIELA HOFF; PAULO ROBERTO COSTA. Estudo comparativo entre diferentes composições de materiais de blindagem e geometrias de feixe aplicadas a instalações para PET: curvas de transmissão simuladas. Rev. Bras. Eng. Bioméd., v. 29, n. 1, p. 86-96, 2013-03-00. (10/12237-7)

GONZALES, A. H. LOPEZ; TOMAL, A.; COSTA, P. R.. Evaluation of characteristic-to-total spectrum ratio: Comparison between experimental and a semi-empirical model. Applied Radiation and Isotopes, v. 100, p. 27-31, JUN 2015. (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)

COSTA, PAULO R.; NERSISSIAN, DENISE Y.; UMISEDO, NANCY K.; GONZALES, ALEJANDRO H. L.; FERNANDEZ-VAREA, JOSE M.. A comprehensive Monte Carlo study of CT dose metrics proposed by the AAPM Reports 111 and 200. Medical Physics, v. 49, n. 1, DEC 2021. (10/12237-7, 18/05982-0)

FRIMAIO, AUDREW; NASCIMENTO, BRUNA C.; BARRIO, RAMON M. M.; CAMPOS, LETICIA L.; COSTA, PAULO R.. X-ray spectrometry applied for determination of linear attenuation coefficient of tissue-equivalent materials (Reprinted from Radiation Physics and Chemistry, vol 160, pg 89-95, 2019). Radiation Physics and Chemistry, v. 167, p. 7-pg., 2020-02-01. (10/12237-7, 17/23034-9)

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)