6533b858fe1ef96bd12b62e8

RESEARCH PRODUCT

Monte Carlo calculation of dose rate distributions around the Walstam CDC.K-type137Cs sources

E. CasalY LimamiJ L LluchFacundo BallesterFacundo BallesterJose Perez-calatayudV PuchadesM A Serrano-andrés

subject

PhysicsPolynomial regressionModels StatisticalRadiological and Ultrasound TechnologyRadiotherapy Planning Computer-AssistedMonte Carlo methodSievert integrallaw.inventionComputational physicsCesium RadioisotopeslawAnisotropyHumansDosimetryRadiology Nuclear Medicine and imagingCartesian coordinate systemStatistical physicsLow dose rateRadiometryDose rateAnisotropyMonte Carlo MethodAlgorithmsSoftware

description

Basic dosimetric data for the Walstam CDC.K-type low dose rate 137Cs sources in water have been calculated using Monte Carlo techniques. These sources, CDC.K1 -K3 and CDC.K4, are widely used in a range of applicators and moulds for the treatment of intracavitary and superficial cancers. Our purpose is to improve existing data about these sources using the Monte Carlo simulation code GEANT3. Absolute dose rate distributions in water have been calculated around these sources and are presented as conventional 2D Cartesian look-up tables. Also the AAPM Task Group 43 formalism for dose calculation has been applied. The calculated dose rate constant for the CDC.K1-K3 source is A = 1.106 +/- 0.001 cGy h(-1) U(-1), and for the CDC.K4 source, A = 1.092 +/- 0.001 cGy h(-1) U(-1). The anisotropy of the sources are accurately studied and F(r, theta) tables are given. Also phi an(r) factors are presented. The radial dose functions are given as a polynomial fit to the calculated data up to 15 cm. Best-fit values of coefficients suitable for use in Sievert integral calculations have been derived.

yearjournalcountryeditionlanguage
2001-07-28Physics in Medicine and Biology
https://doi.org/10.1088/0031-9155/46/7/321