Abstract
A laser based Optically Stimulated Luminescence (OSL) reader is designed and developed for its application in OSL based radiation dosimetry. The system provides the facility to record CW-OSL at two stimulation wavelengths of 442 and 532 nm (Δλ ± 2 nm) respectively. It employs powerful laser based optical stimulation (200 mW/cm2) at the sample position. A photon counting detection module (PMT) is installed in the reader system to record the luminescence signal. The two laser beams were routed on the sample holder via HR (high reflectivity) mirrors, all mounted over a vertical wall for compact design. An electromagnetic optical shutter is used to control the laser beam incident on the sample. The minimum measurable dose (MMD) of the developed reader system was found to be 136 μGy using α-Al2O3:C phosphor under 442 nm stimulation. The design aspects of the developed laser based OSL reader system and the dosimetric characterization using CW-OSL are discussed with its possible application in quality audit of radiotherapy.
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