Calibration Of High Dose Rate Cobalt-60 Source Using A Farmer Type Chamber In A Locally Constructed Hollow Phantom

120 pages ID: PHI0181

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DepartmentPhilosophy
TypeProject
Pages120
Reference StyleYES
FormatMS Word & PDF
Reference No.PHI0181

Abstract

ABSTRACT An important aspect of general quality assurance program for brachytherapy dosimetry is source calibration. Vendors assign large uncertainties of up to ±10 % for the stated source calibrated values. It is thus important to check the vendor stated calibration. There are three main methods of calibrating brachytherapy sources and they are the “Free- in – air” method, using a re-entrant(well ) type chamber and using a thimble (Farmer) type ionization chamber in a phantom. The main objective of this study was to compare values of source strength obtained by using the re-entrant chamber m…

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