Synthesis of CaSO4: Mn nanosheets with high thermoluminescence sensitivity

Nanosheet CaSO4:Mn having an average thickness of 35 nm was synthesized by the hydrothermal method and its thermoluminescence (TL) and photoluminescence (PL) characteristics were studied. Three overlapping TL glow peaks were identified in the complex glow curve using the Tstop technique. Activation energies of 3.76, 2.22 and 2.47 eV and kinetic orders of 1.01, 1.20 and 1.99 were found for three component glow peaks at 485, 504 and 526 K, respectively, using a computerized glow curve deconvolution procedure. An emission spectra band at 497 nm was observed for the synthesized nanosheet. The thermoluminescence sensitivity of the prepared nanocrystallite was found to be around eight times higher than that of LiF:Mg,Cu,P (GR-200) hot-pressed chips. Dosimetric properties of this phosphor, including dose response, fading and reusability, are also presented.