Determination of the Dosimetric Characteristics of BATAN’s 125I Source for Brachytherapy: An Experimental Study

K.Y.P. Sandy (Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia Center for Technology of Radiation Safety and Metrology, National Nuclear Energy Agency, Jl. Lebak Bulus Raya No. 49, Jakarta 12440, Ind)
S.A. Pawiro (Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia)
D.S. Soejoko (Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia)

Atom Indonesia Journal
Vol 44, No 2 (2018): August 2018

125I brachytherapysources withlowphotonenergies have beenwidelyusedin treatingtumors.Accordingto American Association of Physicists in Medicine Task Group No. 43 (AAPMTG-43)recommendations,dosimetric characteristic ofthe newbrachytherapysources shouldbe determined before clinical use.Inthis study, dosimetric characteristic of 125Imanufacturedby BATAN have been determined through measurement by using Thermoluminescent Dosemeter (TLD) andgafchromic XR- QA2film.The radial dosefunctionmeasurements were performedat distances rangingfrom0.5to10cmfromthe source center.The anisotropyfunctions were measuredat distances of2,3,and5cmfromthe source center forangles ranging from0to 90degree inallquadrants.The results indicated that a doserate constants measured with TLD and film are 1.05± 8 % cGy.h-1.U-1and1.01±8 % cGy.h-1.U-1, respectively.The radial dosefunctiondecreasesalongwith the increasingdistance from source andmeetsthe 5thorderpolynomial equation. The anisotropyfunction resultshows thattheanisotropyindosedistributionincreasesalongthe source axis.Thismeasurement data areinagreementwith the previousstudy on EGSnrc Monte Carloresult andhave a similar patternwithIsoAidandGMS BT-125 commercial125Isource.