Analytical Study of Phosphors for Radiation Dosimetry

169 ANALYTICAL STUDY OF PHOSPHORS FOR RADIATION DOSIMETRY Pankaj Pathak1,Manisha Singh2, Pankaj Kumar Mishra3 1,2,3Department of Applied Physics, Amity School of Engineering & Technology, Amity University, Gwalior (MP) Email:[email protected] Abstract The main aim of the study is to analyse the different luminescence properties of phosphors synthesised by Combustion Synthesis (CS) Technique for Radiation Dosimetric Applications. Different electrical, optical and structural properties are seen in inorganic and organic materials in nanocrystallized form as compared to those in the bulk form. Out of these, the ones suited as phosphor host material show considerable size dependent luminescence properties when an impurity is doped in a quantum-confined structure. Pioneering studies of Thermo luminescence (TL) properties of nanostructure materials have produced encouraging results. With an objective of finding a new dosimetric material with higher sensitivity, good reproducibility, low hygroscopicity, and good response at high doses in radiotherapy and in mixed radiation fields and thereby advancing the dosimeters hence developing highly efficient materials, with high TL yield present investigation is undertaken. Activated Nano/Micro phosphor in regulated condition can be obtained by employing different Synthesis methods. Luminescent Properties exhibited by so prepared Phosphors can be tailored by impurities present, type of dopands used, molar composition of dopands and methods employed for their Synthesis, and temperature of synthesis. The materials of required properties can be synthesized by employing, hydrothermal reaction, sol-gel synthesis, micro-emulsion synthesis and mechanochemical synthesis. Key-words: Phosphors, Luminescence, Radiation Dosimetry Introduction: Thermally stimulated luminescence also termed as thermoluminescence (TL) is a powerful technique extensively used for dosimetry of ionizing radiations. TL dosimeter (TLD) materials presently in use are inorganic crystalline materials. They are in the form of chips, single crystals or microcrystalline size powder. The most popular of them are LiF: Mg, Ti, LiF: Mg, Cu, P, CaF2, Li2B4O7, CaSO4: Dy, CaF2:Dy.The TL results of the recently reported nanomaterials have revealed very imperative characteristics such as high sensitivity and saturation at very high doses .However, recent TL studies of different luminescent ceramic micro or nanomaterials showed that they have a potential application in radiation dosimetry .These materials spread over various applications