Wereyarmarst JaroenkunathumPuntawit NatakulUsa KittisakchaiChanittra Maenmeun2011-02-162011-02-162010-01-222010-01-22Bulletin of the Department of Medical Sciences - วารสารกรมวิทยาศาสตร์การแพทย์; Vol. 51 No. 1 January-March 2009http://imsear.searo.who.int/handle/123456789/130478The Secondary Standard Dosimetry Laboratory (SSDL) of Division of Radiation and Medical Devices is a member of the International Atomic Energy Agency (IAEA) and World Health Organization (WHO) network of SSDL to provides the dosimetry calibration services to maintain the radiation standard.A Reference standard dosimeter has been calibrated at Osterreichisches Forschungszentrum Seibersdorf Ges. M.b.H. Austria. According to ISO/IEC 17025, calibration laboratory shall evaluate the uncertainty of measurement for all calibrations entities. The uncertainty budget for survey meter calibration are uncertainties from the calibration certificate from primary standard, temperature, pressure, distance, working standard dosimeter reading, resolution and stability of working standard dosimeter and test dosimeter reading. The expanded uncertainty, found to be 5.1% at confidence level of 95% (k=2)en-USBulletin of the Department of Medical Sciences - วารสารกรมวิทยาศาสตร์การแพทย์Articles