Dosimetric studies on radiation induced radical in Barium sulphate using ESR and PL techniques

Thermal Luminescence (TL) dosimeters with small particle size, low cost and easy handling are some of the preferred choices of detectors which could be employed for the purpose of individual and environmental radiation monitoring of the cumulative dose over a wide range. CaSO₄ doped with Dy has been reported to be the most sensitive in this series. Another interesting phosphor in this series is CaSO₄: Eu, which too has been widely studied by several workers. Micro-crystalline and nano- crystalline forms of BaSO₄: Eu have been reported to show satisfactory performance for measuring γ-my exposures. Nano crystalline BaSO₄ is reportedly more sensitive than both microcrystalline BaSO₄ and alanine over a wide range of gamma ray dose (0.4 Gy upto 1 kGy). The estimated values of critical level DCL and detection limit DDL values for nano-crystalline BaSO₄ were found to be 0.08 and 0.16 Gy, respectively which are lower than that for alanine and micro-crystalline BaSO₄. In this context, dosimetric studies on BaSO₄: Eu have been carried out and the radiation induced radicals were characterized by techniques viz., Electron Spin Resonance (ESR), Thermally Stimulated Luminescence (TSL) and Photo Luminescence (PL)