Abstract
Performance characterisation has been carried out of nanoDotTM OSLDs and TLD-100TM, validating their use for diagnostic x-ray dose profile assessments. Investigations include optical annealing, signal depletion, signal fading, dose-response, sensitivity, and energy dependence. Both dosimeter types were exposed using the Con-stant Potential Industrial X-ray (Model Philips MG 165) in Standard Radiation Qualities (RQT) procedure located in Nuclear Malaysia, Bangi. OSLD annealing using a 14 W compact fluorescent lamp showed an average signal loss of-93% as a result of 60 min of illumination. For dosimetric signal depletion, screened nanoDotTM OSLDs gave rise to the most favorable performance, with a mean signal loss of 1.0% per reading. In respect of signal fading, similar favorable performance was found for the screened nanoDotTM OSLDs, after a stabilisation period of 11-12 days post-irradiation, the average reading decreased by-1% over a further 17 days. For doses up to 500 mGy the TLD-100TM and screened nanoDotTM OSLDs both provide a highly linear response, with a regression coefficient of 0.999 in both cases. Linear energy dependence was found for RQT spectra from 100 to 150 kV.