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Dosimetric characteristics of the CDC‐type miniature cylindrical 137 Cs brachytherapy sources
Author(s) -
PérezCalatayud J.,
Ballester F.,
SerranoAndrés M. A.,
Lluch J. L.,
Puchades V.,
Limami Y.,
Casal E.
Publication year - 2002
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 - 10.1118/1.1461844
Subject(s) - monte carlo method , brachytherapy , dosimetry , radiation treatment planning , dose rate , nuclear medicine , physics , attenuation , task group , computational physics , medical physics , optics , computer science , mathematics , radiation therapy , medicine , engineering , statistics , radiology , engineering management
The low dose rate CDC‐type miniature cylindrical137 Cs sources are available, with one or three active beads, for use in source trains in automatic and manual afterloading systems for gynecological brachytherapy. Absolute dose rate distributions in water have been calculated around these sources using the Monte Carlo GEANT3 code and they are presented as conventional two‐dimensional Cartesian lookup tables. The AAPM Task Group 43 formalism for dose calculation has been also applied. The dose rate constant obtained for the one bead source is Λ = 1.113 ± 0.003 cGyh − 1 U − 1, and the value for the three bead source is Λ = 1.103 ± 0.003 cGyh − 1 U − 1. Finally, for the treatment planning systems based on Sievert‐type algorithms, the attenuation coefficients that best reproduce Monte Carlo dose rate distribution are given.