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Monte Carlo calculations and experimental measurements of dosimetric parameters of the IRA − P 103 d brachytherapy source
Author(s) -
Sadeghi Mahdi,
Raisali Gholamreza,
Hosseini S. Hamed,
Shavar Arzhang
Publication year - 2008
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2870229
Subject(s) - monte carlo method , imaging phantom , dosimeter , brachytherapy , thermoluminescent dosimeter , dosimetry , materials science , anisotropy , dose profile , optics , physics , computational physics , medical physics , nuclear medicine , radiation , mathematics , radiation therapy , medicine , statistics
This article presents a brachytherapy source havingP103 d adsorbed onto a cylindrical silver rod that has been developed by the Agricultural, Medical, and Industrial Research School for permanent implant applications. Dosimetric characteristics (radial dose function, anisotropy function, and anisotropy factor) of this source were experimentally and theoretically determined in terms of the updated AAPM Task group 43 (TG‐43U1) recommendations. Monte Carlo simulations were used to calculate the dose rate constant. Measurements were performed using TLD‐GR200A circular chip dosimeters using standard methods employing thermoluminescent dosimeters in a Perspex phantom. Precision machined bores in the phantom located the dosimeters and the source in a reproducible fixed geometry, providing for transverse‐axis and angular dose profiles over a range of distances from 0.5 to 5 cm. The Monte Carlo N ‐particle ( MCNP ) code, version 4C simulation techniques have been used to evaluate the dose‐rate distributions around this modelP103 d source in water and Perspex phantoms. The Monte Carlo calculated dose rate constant of the IRA − P103 d source in water was found to be 0.678 cGyh − 1U − 1with an approximate uncertainty of ± 0.1 % . The anisotropy function, F ( r , θ ) , and the radial dose function, g ( r ) , of the IRA − P103 d source were also measured in a Perspex phantom and calculated in both Perspex and liquid water phantoms.