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Monte Carlo evaluation of specific dose constants in water for 1 2 5 I seeds
Author(s) -
Williamson Jeffrey F.
Publication year - 1988
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 - 10.1118/1.596181
Subject(s) - monte carlo method , physics , dosimetry , nuclear physics , radiochemistry , nuclear medicine , chemistry , mathematics , medicine , statistics
To clinically utilize relative three‐dimensional dose distribution data for 1 2 5 I seeds in water, the specific dose constant must be known. This constant is the ratio of absolute dose rate in medium, 1 cm from the source on its transverse bisector, to source strength. We have used the Monte Carlo method to calculate specific dose constants in water for three types of 1 2 5 I seeds (models 6711, 6701, and 6702). Our photon transport code realistically models the complex internal structure of these interstitial sources as well as the exposure standardization experiments conducted at the National Bureau of Standards which form the basis of 1 2 5 I source strength specification. In addition, relative attenuation factors for the three seed types are presented. Our results indicate that published data overestimate the specific dose constant by 10% to 14%.