Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2012  |  Volume : 37  |  Issue : 4  |  Page : 219-225

Dosimetric comparison between the microSelectron HDR 192 Ir v2 source and the BEBIG 60 Co source for HDR brachytherapy using the EGSnrc Monte Carlo transport code


1 Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh
2 Department of Medical Physics, Gummersbach Hospital, Academic Teaching Hospital of the University of Cologne, Germany

Correspondence Address:
M Anwarul Islam
Medical Physicist, Oncology and Radiotherapy Centre, SQUARE Hospitals Ltd, 18/F, West Panthapath, Dhaka - 1205
Bangladesh
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Source of Support: A part of this work has been done in Heidelberg under the collaboration program between Heidelberg University, Germany and Gono University, Bangladesh with the financial support of the German Academic Exchange Service (DAAD), Conflict of Interest: None


DOI: 10.4103/0971-6203.103608

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Manufacturing of miniaturized high activity 192 Ir sources have been made a market preference in modern brachytherapy. The smaller dimensions of the sources are flexible for smaller diameter of the applicators and it is also suitable for interstitial implants. Presently, miniaturized 60 Co HDR sources have been made available with identical dimensions to those of 192 Ir sources. 60 Co sources have an advantage of longer half life while comparing with 192 Ir source. High dose rate brachytherapy sources with longer half life are logically pragmatic solution for developing country in economic point of view. This study is aimed to compare the TG-43U1 dosimetric parameters for new BEBIG 60 Co HDR and new microSelectron 192 Ir HDR sources. Dosimetric parameters are calculated using EGSnrc-based Monte Carlo simulation code accordance with the AAPM TG-43 formalism for microSlectron HDR 192 Ir v2 and new BEBIG 60 Co HDR sources. Air-kerma strength per unit source activity, calculated in dry air are 9.698×10 -8 ± 0.55% U Bq -1 and 3.039×10 -7 ± 0.41% U Bq -1 for the above mentioned two sources, respectively. The calculated dose rate constants per unit air-kerma strength in water medium are 1.116±0.12% cGy h -1 U -1 and 1.097±0.12% cGy h -1 U -1 , respectively, for the two sources. The values of radial dose function for distances up to 1 cm and more than 22 cm for BEBIG 60 Co HDR source are higher than that of other source. The anisotropic values are sharply increased to the longitudinal sides of the BEBIG 60 Co source and the rise is comparatively sharper than that of the other source. Tissue dependence of the absorbed dose has been investigated with vacuum phantom for breast, compact bone, blood, lung, thyroid, soft tissue, testis, and muscle. No significant variation is noted at 5 cm of radial distance in this regard while comparing the two sources except for lung tissues. The true dose rates are calculated with considering photon as well as electron transport using appropriate cut-off energy. No significant advantages or disadvantages are found in dosimetric aspect comparing with two sources.


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