Optically Stimulated Luminescence Materials Based on CaS for Gamma and Fast Neutron Dosimetry

• Published in: Radiation protection dosimetry 1996-06, Vol.65 (1-4), p.297-300
• Main Authors: Hütt, G., Jaek, I.
• Format: Article
• Language: English
• Subjects: Applied radiobiology (equipment, dosimetry...); Biological and medical sciences; Biological effects of radiation; Fundamental and applied biological sciences. Psychology; Tissues, organs and organisms biophysics
• ISSN: 0144-8420; 1742-3406
• DOI: 10.1093/oxfordjournals.rpd.a031645

The OSL selective dosimetric materials based on CaS doped with Bi and In ions were synthesised. Physicochemical properties of such materials are analysed in detail and a model of traps and recombination centres is proposed. For CaS-In phosphors the emission in the range of 2.4-2.1 eV is assigned to the defect Me3+Me+ or Me3+M-, whereas for CaS-Bi phosphors the centres Bi3+ or Bi3+Na+ are responsible for the emission at 2.7 eV. The traps revealed in OSL are attributed to intrinsic defects of CaS (energy level of 1.65 eV) and to a single Me3+ state (1.35-1.45 eV). The a/? ratio of 2000 (arb. units) is reached for the best OSL CaS-In samples synthesised. However, the presence of fading for elaborated OSL dosimetric materials needs further improvement in technology.