Investigation of some commercial TLD chips/discs as UV dosimeters

• Main Authors: Noh, A.M., Amin, Y.M., Mahat, R.H., Bradley, D.A.
• Format: Article
• Published: Elsevier 2001
• Subjects: Q Science (General); QC Physics
• Online Access: http://eprints.um.edu.my/12145/; http://www.sciencedirect.com/science/article/pii/S0969806X01003139; http://dx.doi.org/10.1016/S0969-806X(01)00313-9

Using a deuterium UV source, we have investigated the response of a number of commercially available thermoluminescence (TL) dosimeters (TLDs) to UV radiation (UVR), including LiF : Mg, Cu, P (TLD-100 H), CaF2 : Dy (TLD-200), CaF2 : Mn (TLD-400), Al2O3 (TLD-500), 7LiF : Mg, Cu, P (TLD-700 H) and CaSO4 : Dy (TLD-900). The intrinsic method was used to detect UVR, while trap depth and frequency factors were estimated using the initial rise method. We have studied TL intensity as a function of exposure time, observing high sensitivity of TLD-500 to UVR. Conversely, TLD-400 displays weak sensitivity to these same radiations. Although TLD-900 and TLD-200 are both less sensitive to UVR than TLD-500, they each provide a linear response to UVR. The possible use of these phosphors as UV dosimeters has been further appraised, examining thermal fading effects and fading due to light exposure.