The service for the calibration of dose calibrator has been introduced by the Medical Physics Group since 2007. In 2014, a total of 43 units of dose calibrator from 18 nuclear medicine centres and radioisotopes production facilities have been calibrated. The dose calibrator calibration includes checking for: (i) Dipper and well liner contaminations; (ii) System stability; (iii) Accuracy of radioactivity measurement using Cobalt-57, Barium-133, Cesium-137 and Cobalt-60 standard sources; (iv) Constancy and precision of radioactivity measurements; (v) Linearity of radioactivity measurement; and (vi) Effects of source positioning and its volume to the radioactivity measurement. A calibrated Fidelis Secondary Standard Dose Calibrator having traceability to the National Physical Laboratory (NPL), United Kingdom is used as the national standard instrument.The calibration procedure of dose calibrator and their acceptance criteria are based on the IAEA’s Technical Reports Series No.454: 2006.