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Dose parameters of 1 2 5 I and 1 9 2 Ir seed sources
Author(s) -
Weaver Keith A.,
Smith Ver,
Huang David,
Barnett Colleen,
Schell Michael C.,
Ling Clifton
Publication year - 1989
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 - 10.1118/1.596322
Subject(s) - physics , monte carlo method , nuclear medicine , dosimetry , analytical chemistry (journal) , chemistry , mathematics , statistics , medicine , chromatography
As mandated by an NCI brachytherapy contract, we measured dosimetric parameters for 1 9 2 Ir seeds and two models of 1 2 5 I seeds. Measurements were with LiF powder in a water‐equivalent phantom. Data were corrected for background, sample mass, and finite detector volume. Selected parameters were also investigated through Monte Carlo calculations. Results are presented in terms of a dose parametrization that is described in detail, and are compared to published data. Our results agreed well with published data for relative quantities such as radial and angular dose dependence. Our measured value for the 1 9 2 Ir dose factor was 4.55 cGy(H 2 O) cm 2 mCi − 1 h − 1 , also in good agreement with commonly used values. However, the measured dose factors for 1 2 5 I seed models 6702 and 6711 were 1.18 and 1.06 cGy(H 2 O) cm 2 mCi − 1 h − 1 , values well below those in general use.