Evaluation of dose Performance calibrator in Radiation Therapy and Nuclear Medicine in Center Khartoum (Nuclear Medicine Department)

Abstract

This study is concerned with quality control of the dose calibrator which is located in the Radiation Therapy and Nuclear Medicine Center of Khartoum .The objective of the study is to evaluate the dose calibrator performance .Quality control tests were performed in the period between Dec/ 2015 and Jan/2016 .They included general observations to the components of the device, background measurements, precision, accuracy, continuity ,linearity and geometric dependency . Two standard radionuclide’s Cs-137 and Tc-99m were utilized for the purpose of the study and has come to the following results, all the components of the device work properly and readings for background radioactivity were in the acceptable range (0.562+0.45 ) . Concerning Precision testing the error of the reading was (0.39%), and it was within the accepted range. Concerning accuracy testing the error of the readings was within (0.27% ) , and it was within the accepted range .For constancy test the error value of readings was (2.47%) , and it was also within the accepted range and the error of readings concerning linearity testing was (3.7%) , and it was within the accepted range and finally the results of geometric dependency showed that the correction factor was within the accepted range(0.95-1.05). All the results showed that the devise has good performance and there is no need for any correction and maintenance.