Fabrication and TL characteristics of CaSO4:Dy Tl powder

Calcium Sulphate activated with Dy is the one of the most sensitive TL dosimeter, and is widely used for routine dose measurements in personal monitoring. Korea Atomic Energy Research Institute (KAERI) has continued the research for developing new type of CaSO4:Dy TL material during past three years. These paper describes further improvements of CaSO4:Dy TL powder. CaSO4:Dy phosphore powder was prepared using the acid evaporation method by Yamashita doping 0.1 mol% of Dy. We improved the method to divide crystalline powders with non-crystalline ones by washing these CaSO4:Dy powders in distilled water, and only crystalline powder was selected to be used as TL phosphore. These CaSO4:Dy TL powder has more sensitivity than commercialized Teledyne powder, and has excellent dosimetric characteristics in dose response, energy dependence and fading effect