Synthesis of β-Ca 2 P 2 O 7 :Tb 3+ to gamma radiation detection by thermoluminescence.

In this work, luminescent emissions of beta-calcium pyrophosphate doped with terbium ions (β-Ca2 P2 O7 :Tb3+ ) were studied. The Ca2 P2 O7 :Tb3+ powders were prepared by precipitation and annealed at 900°C for 2h was applied on the powders to observe the beta phase. Radioluminescence measurements showed emission bands related with5 D3 (5 D4 )→7 FJ transitions of Tb3+ ions. Three overlapped peaks at 126, 165 and 220°C were observed in thermoluminescence response. A linear TL dose-response in the range of 0.2-10Gy and an acceptable TL reproducibility were showed by the β-Ca2 P2 O7 :Tb3+ samples exposed to60 Co gamma radiation. The TL glow curves were analyzed by Initial Rise method and Computational Glow-Curve Deconvolution assuming a General Order Kinetic model to evaluate the kinetic parameters related with the TL peaks.