Document Type : Research Paper

Authors

• A.R Moini
• M Gholampoor
• J Gheisari
• Gh Mirjalili
• M.A Shafaie
• L Shekari
• A Shahvar

Abstract

CaSO₄:Dy thermoluminesconce dosimeter (TLD) is one of the best materials for environmental and personal dosimetry due to its high sensitivity and high dose saturation. In this investigation, the dose response of CaSO₄:Dy with three concentrations, 0.11, 0.15 and 0.2 mol% of dysprosium, to ⁶⁰Co gamma rays doses up to 3.7Gy were studied. The effect of heating program on glow curve was also studied. The glow peaks of CaSO₄:Dy were seen at 100^oC and 167^oC. The pellets have high sensitivity and in the case of sample with 0.2 mol% of dysprosium, the relative sensitivity is 12. The dose response is found to be linear up to 3.7Gy and the fading was approximately about 36% in 10 days.

Highlights

 

1. 1.    S.W.S. McKeever, M. Moscovitch, P.D. Townsend, “Thermoluminescence dosimetry materials,” Nuclear Technology Publ, Ashford, Kent 192 (1995).

 

1. 2.    T. yamashita, N. Nada, H. Onishi, In: Porc, “2^nd Conf. on luminescence dosimetry,” Gatlinburg, CONF 680920, p. 4 (1968); Health Phys. 56, 551 (1986).

 

1. 3.    M.G. Guelev, I.T. Mischev, B. Burgkhardt, E. Piesch Radiation Protection Dosimetry, 51-35 (1994).

 

1. 4.    R. Abubakar, S. Untung, M. Oberhofer, Radiation Protection Dosimetry 33, 95 (1990).

 

 

Keywords

• Dysprosium Impurity
• Thermoluminescent Dosimeter
• Glow Curve
• Fading
• Gamma Ray
• Sensitivity