University Publications

The delivery of a treatment in radiotherapy requires many sequential, complex steps of prescription, imaging, calculation and patient positioning. Every step can contribute to the total uncertainty of delivered dose. So it is necessary to check each step, in-vivo dosimetry (IVD) is the only check that performed during the patient treatment, and it is independent of the calculation method, it is the only method that can trace a number of errors. The aim of this study is to verify response of the thermo luminescence detectors (TDLs) type (LiF:Mg;Cu;P) used in radiotherapy, this type of the (TLDs) is preferable for diagnostic radiology and radiotherapy. To establish calibration procedure of (TLDs) (LiF:Mg;Cu;P) for therapy application at Radiation and isotope center Khartoum (RICK) and to calculate entrance dose obtained by the treatment planning system with measured dose using (TLDs) . In this study the (TLDs) calibrated against farmer type chamber (FC 65-G) with Cobalt-60 photon beam. The Rando phantom with 6 (TLDs) in place were irradiated with time obtained from treatment planning system (TPS) for tow tangential beams used for breast irradiation, and measured by the (TLDs) reader, then compared with calculated dose. For Breast entrance doe (TLDs) were placed on the patient surface and irradiated with time obtained by TPS for tow tangential beams used for breast irradiation, then (TLDs) were measured by (TLDs) reader, and compared with calculated dose, the comparison of the measured and calculated doses are expressed in terms of percentage difference. Comparison of the calculated dose by TPS (pinnacle) with the measured dose by (TLDs) for Rando phantom for Breast irradiation, each calculated dose was close to measured one and it’s within the tolerance level.