Comparing the effect of electron beam, beta and ultraviolet C exposure on the luminescence emission of commercial dosimeters

This paper reports on the luminescence characterization of TLD-100 (LiF: Ti, Mg), TLD-200 (CaF2:
Dy), TLD-400 (CaF2: Mn) and GR-200 (LiF: Mg, Cu, P) dosimeters exposed to electro beam, beta
and ultraviolet C radiation -UVC-. All of them show high sensitivity to radiation regardless of
whether it is ionizing or partially ionizing radiation based on their luminescence properties
(cathodoluminescence -CL- or thermoluminescence -TL-). CL emission differs significantly among
them in shape and intensity due to their chemical compositions. LiF samples display three
maxima at: (i) 300-450 nm linked to intrinsic and structural defects, (ii) a green waveband
probably due to F3+ centres or the presence of hydroxyl groups and (iii) the red-infrared emission
band associated with F2 centres. However, CL spectra from the CaF2 dosimeters display
meaningful differences due to the dopant. TLD-200 is characterized by an emission with four
sharp individual peaks in the green-IR spectral region (due to the Dy3+), whilst TLD-400 exhibits
a broad maximum peaked at ̴500 nm (linked to the Mn2+). On the other hand, the variation in
the TL glow curves allows to discriminate the TLDs exposed to beta and UVC radiation since they
give rise to different chemical-physical processes and that have been studied from the
estimation of the kinetic parameters by means of the Computerised Glow Curve Deconvolution
(CGCD) method.