Al2O3:C and LiF: Mg, Ti characterisations at 100–150 kV energy range for computed tomography dose measurement

• Main Authors: Omar, Ratna Suffhiyanni, Hashim, S., Bradley, David A., Abdul Karim, Muhammad Khalis, Kobayashi, Ikuo, Abdul Kadir, Ahmad Bazlie, Hashim, Asmaliza
• Format: Article
• Published: Elsevier Ltd 2022
• Subjects: QC Physics
• Online Access: http://eprints.utm.my/103898/; http://dx.doi.org/10.1016/j.radphyschem.2022.110365

Performance characterisation has been carried out of nanoDot™ OSLDs and TLD-100™, 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 Constant 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 nanoDot™ 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 nanoDot™ 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-100™ and screened nanoDot™ 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.