Validity of the interval method for the determination of the anisotropy factor of high dose rate 192Ir sources.
OBJECTIVE
This study investigates the validity of the interval method to determine the anisotropy factors of high dose rate (HDR) 192Ir sources.


METHODS
A calculation method, which is one of the various numerical implementations of the Sievert integral and known as the interval method, is applied to determine the anisotropy factors of a HDR 192Ir source. Calculated results from r = 1 cm to 10 cm are compared to published data.


RESULTS
The comparison shows that the error resulting from the interval method increases from 1.3 to 28.1% as the radial distance increases from r = 1 cm to 10 cm and is significantly smaller than that previously reported.


CONCLUSIONS
The interval method might be considered as a method that provides a very rough estimate of the anisotropy of HDR 192Ir sources whenever no conclusive anisotropy data is available.
Cho
S H
SH
Department of Nuclear Engineering, Texas A&M University, College Station 77843-3133, USA.
Muller-Runkel
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D001918:Brachytherapy; D007496:Iridium Radioisotopes; D009010:Monte Carlo Method; D011874:Radiometry / Q000379:methods*; D015203:Reproducibility of Results; D014867:Water
D007496:Iridium Radioisotopes; D014867:Water