GDL

The International Atomic Energy Agency (IAEA) and World Health Organization (WHO) operate the IAEA/WHO TLD postal dose audit program using thermoluminescence dosimeter (TLDs) for Secondary Standard Dosimetry Laboratory (SSDL) and user every year. As National Reference Laboratory in the field of radiation metrology, PTKMR - BATAN always participate in the postal dose audit programme on therapy level for 60Co beam. On the postal dose audit programme, the uncertainties in the dose determination from TLD measurements have been evaluated by IAEA, which is comprises of uncertainties in the calibration coefficient of the TLD system and uncertainties in factors correcting for dose response non linearity, fading of TL signal, energy response, and influence of TLD holder. The individual uncertainties then have been combined to estimate the total uncertainty in the dose evaluated from TLD measurements. The combined relative standard uncertainty in the dose determined from TLD measurement has been estimated to be 1.2% for irradiation with 60Co gamma rays and 1.6% for irradiation with high-energy X-rays. Results from irradiation by Bureau Internationale des Poids et Mesures uncertainties, whereas TLD results of radiotherapy centres show higher standard deviations than those derived theoretically. This paper presented the result of TLD dose audit for 60Co beam owned by PTKMR - BATAN on the year of 2006-2008.

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