Thermoluminescence of NaCl:Ca and its use in gamma-dosimetry

The present work involves the extensive study of the thermoluminescent behaviour of untreated and thermally pre-treated, undoped and Ca-doped NaCl phosphors. It was observed that NaCl:Ca specimens, quenched from 750 degrees C, display optimum TL output with a dominant and well-defined glow peak around 147 degrees C (peak II). The TL centre namely, a Ca-dipole nearby a negative-ion vacancy in the dislocation region, is suggested to be responsible for the occurrence of the glow peak II. The study of the dosimetric properties of this peak for gamma-radiation indicated that the NaCl:Ca phosphor satisfies the most basic need of an efficient TLD material. It is proposed that the present material can be used in gamma-dosimetry for the range 10(0)-10(4) R.