During the years 1985-2008, the Secondary Standards Dosimetry Laboratory of Malaysia (SSDL Malaysia) has participated 37 times in the IAEA/WHO intercomparison programmes. This paper reports an analysis of the intercomparison data and demonstrates that the quality of the SSDL calibration service is well within the limits required by IAEA.

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Abstract. OSLD was evaluated in terms of energy response and accuracy of the measured dose in comparison with TLD-100H and TLD-100. The OSLD showed a better energy response performance for H p (10) whereas for H p (0.07), TLD-100H is superior than the others. The OSLD dose accuracy is comparable with the other two dosimeters since it fulfilled the requirement of the ICRP trumpet graph analysis.

Participation of Secondary Standard Dosimetry Laboratory (SSDL) of Malaysia in the IAEA/WHO Postal Dose Quality Audit Service is very important in confirming the traceability of absorbed dose measurements provided to the radiotherapy centres. In the audit, the SSDL was supplied with a set of dosimeter for irradiation with absorbed dose to water of 200 cGy in reference conditions using 60Co teletherapy or medical linear accelerator. In the period of 2009 to 2019, a total of 10 photon beams from 60Co teletherapy unit, 6 MV X-ray and 10 MV X-ray produced by medical linear accelerator have been audited. The results of the audit demonstrate that the mean of percentage deviations between the SSDL and the IAEA measurements was -0.35% with standard deviation of 0.86%. The deviations vary between a minimum percentage relative deviation of -2.5% and a maximum of 0.6%. These results were considered satisfactory in which complied with the IAEA’s acceptance limit of ± 3.5%.