Secondary Standard Dosimetry Calibration
In order to verify the accuracy of the radiation measuring instruments, especially those are used for personal protection, it is mandatory to calibrate them according to an international standard. This further assures the safety of radiation workers and operators. The Secondary Standard Dosimetry Laboratory (SSDL) is also accredited and is comply with the ISO/IEC 17025:2005 standards for protection level calibrations. Its irradiation standards are inherited from IAEA and BIPM (French Bureau International des Poids et Mesures/ International Bureau of Weights and Measures) primary standards.
The calibration has to be performed for all protection level radiation measuring/monitoring instruments annually or bi-annually depending on the requirement.
One of the SSDL’s main responsibility is to maintain the secondary standard gamma beam irradiator for gamma calibration, comprising of Cs-137 (662 keV) and Co-60 (1250 keV) gamma sources. The SSDL sustains the gamma beams of these sources to be compatible with the primary standards at IAEA.
A narrow spectrum medical X-ray beam, in compliance with the ISO 4037 standard is also being maintained and used for calibration of X-ray measuring and generating instruments in diagnostic radiology.
The laboratory is currently expanding its capacity to introduce therapy level calibrations to the radiation generators, measuring instruments used in therapeutic and interventional radiology.
The SSDL provides island-wide calibration services to the radiation measuring instruments (Survey meters, Pocket dosimeters, Contamination monitors, etc.) and medical X-ray, gamma ray diagnostic machines.