TABLE OF CONTENTS CaF 2, activated by various dopants, is a TL phophor widely used in many dosimetric applications. It is used as natural CaF 2 or with different activators as Mn, Dy and Tm [1,2,3,4,5,6,7,8,9,10].
Preparation of CaF 2:Mn is carried out using the precipitation technique from a solution of CaCl 2 and MnCl 2 in NH 4F. The precipitate is dried and heated in oven with inert atmosphere at 1200 C, then it is powdered and graded. The final material can be pressed and sintered. Its atomic number is 16.57. Its sensitivity at the 30 keV of photon energy is 15 times greater than the sensitivity at the 60Co energy.
The linearity of CaF 2 natural is observed up to 50 Gy. CaF 2:Mn, produced by Harshaw under the name TLD-400, gives a linear response up to 2 KGy, CaF 2:Dy has been commercialized by Harshaw under the name TLD-200; it presents a complicate glow curve consisting of six peaks. The TL response is linear up to 1 KGy. CaF 2:Tm, known as TLD-300, shows three resolved peaks, high stability and selective peak sensitivity to the radiation quality.
1. Schayes R. and Brooke C., Rev. MBLE 6 (1963) 24
2. Ginther R.J., CONF 650637 (1965)
3. Binder W., Disterhoft S. and Cameron J.R., Proc. 2 nd Int. Conf. Lumin. Dos., Gatlinburg (USA), 1968
4. Furetta C. and Lee Y.K., Rad. Prot. Dos.
