Synthesis of CaSO₄: Mn nanosheets with high thermoluminescence sensitivity.

Nanosheet CaSO₄:Mn having an average thickness of 35nm 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 T(stop) technique. Activation energies of 3.76, 2.22 and 2.47eV and kinetic orders of 1.01, 1.20 and 1.99 were found for three component glow peaks at 485, 504 and 526K, respectively, using a computerized glow curve deconvolution procedure. An emission spectra band at 497nm 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.