DEVELOPMENT OF NACL-K(6T) PHOSPHOR FOR THERMOLUMINESCENCE DOSIMETRY

The present paper discusses the development of the NaCl:K (10(-1) mola r fraction of potassium) phosphor as dosimeter material for beta-radia tion thermoluminescent dosimetry (TLD). The TLD grade NaCl:K(GT) mater ial was prepared by annealing the NaCl:K powder obtained from aqueous solution by the method of recrystalization and annealed at 600 degrees C for two hours in open air. It is observed that thermal glow curves of NaCl:K(GT) specimen exhibit well defined glow peak around 170 degre es C along with a weaker peak at lower temperature. The high-temperatu re peak is found to grow supralinearily with increase in beta dose in the range 10-2x10(3) rad. Since the nature of glow curves under the in fluence of different doses remains more or less identical, it is belie ved that the phosphor does not undergo radiation damage and give high intrinsic TL around peak III. Examination of the system for fundamenta l dosimetry requirement shows that the NaCl:K(GT) material can be used as a suitable TLD material in beta radiation.