Nuclear medicine use many different radioactive isotopes for radiation diagnostics and for therapy. The amount of radioactivity has to be determined exactly before it is applied to a patient. The Dose calibrators have to measure the radioactivity of gamma and beta with different energies precisely for high quality imaging and for applying the right amount of radiation to treat disease. This study was carried out to assess the performance of dose calibrators which work in nuclear medicine departments in Sudan Country. Four quality control tests were carried out using tow standard Radionuclides, 137Cs and 57Co, which accuracy, constancy, linearity and geometry. All results that obtained from the study has been compared with the international standard (± 5%) and the results showed that all dose calibrators has good performance and there is no need for any correction tables or factors or maintenance.

Ahmed Yassen works as a Teaching Assistant and Medical Physicist at Department of Medical Physics, NCI,University of Gezira,He received his B.Sc.(Honours) in Medical Physics from Red Sea University, Sudan (2014). and his M.Sc.degree in MP(Student) in UofG, Sudan (2017), His research interests are in the area of Monte Carlo Simulation and dosimetry.