title: High-sensitive CaSO4:Dy thermoluminescent phosphor synthesis by co-precipitation technique.
abstract: This paper describes the successful development of the co-precipitation technique for the preparation of a high-sensitive dysprosium-doped calcium sulphate (CaSO(4):Dy) thermoluminescent dosimetry (TLD) phosphor with dosimetric glow peak at approximately 230 degrees C which is a desired development in the field of radiation protection dosimetry. The main advantages of this co-precipitation technique over the conventional recrystallisation technique of phosphor preparation are: (i) preparation time is very less; (ii) quantity of sulphuric acid evaporated is insignificant; (iii) higher TL sensitivity -20% more than the present material; (iv) better glow curve structure; (v) lesser glow peak shift and better linearity to gamma and (vi) uniform crystal morphology and lower grain size-all grains are mostly cuboidal in shape, quite uniform and small (average size about 25 microm), suitable for manufacturing teflon discs in as-prepared form. Optimum values of various parameters in the method of preparation for a batch of 20 g CaSO(4):Dy phosphors to obtain maximum TL sensitivity, with favourable glow curves are studied.
authors: Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India. arunachalamlakshmanan@yahoo.com
authors: A R
authors: AR
authors: Lakshmanan
authors: M T
authors: MT
authors: Jose
authors: O
authors: O
authors: Annalakshmi
mesh_terms: D002133:Calcium Sulfate / Q000737:chemistry* / Q000528:radiation effects; D011232:Chemical Precipitation; D003460:Crystallization; D004419:Dysprosium / Q000737:chemistry* / Q000528:radiation effects; D005720:Gamma Rays; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*
chemical_list: D004419:Dysprosium; D002133:Calcium Sulfate