Monte Carlo evaluation of specific dose constants in water for /sup 125/I seeds

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Med. Phys.; (United States)

OSTI ID:7063843

Williamson, J F

To clinically utilize relative three-dimensional dose distribution data for /sup 125/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 /sup 125/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 /sup 125/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%.

• Research Organization: Department of Radiation Oncology and the Arizona Cancer Center, University of Arizona, Tucson, Arizona 85724
• OSTI ID: 7063843
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 15:5; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BETA DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
DOSE RATES
DOSIMETRY
ELECTRON CAPTURE RADIOISOTOPES
ELECTRON DOSIMETRY
GAMMA DOSIMETRY
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPES
MONTE CARLO METHOD
NEUTRAL-PARTICLE TRANSPORT
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PHOTON TRANSPORT
RADIATION DOSE DISTRIBUTIONS
RADIATION TRANSPORT
RADIOISOTOPES
THERAPEUTIC USES
USES
WATER