Investigation of sensitivity loss and recovery method of CaF2:Mn (TLD-400) thermoluminescent dosimeter irradiated to high gamma dose

Document Type : Original Article

Authors

Faculty of Physics, University of Kashan, Kashan, Esfahan, Iran

Abstract

The change in the sensitivity of the CaF2:Mn (TLD-400) thermoluminescent dosimeter was studied under high-dose exposure. First, the sample was exposed to 1kGy and then the sensitivity loss was checked by standard annealing and irradiating to 1 Gy and compared with the control dosimeter received the same dose of 1 Gy. Also, by applying different heating processes, the appropriate heating time is obtained to recover the lost sensitivity. In addition, the kinetic parameters of the TLD-400 TL dosimeter were determined before and after receiving a high dose, at each stage of the heating process, and recovery of sensitivity and modifications were identified. The kinetic parameters are obtained by fitting experimental data with a theoretical curve obtained from the general order model using a computer program.

Keywords

References

1. D. L. Fehl, D. I. Muron, B. R. Suijka, D. W. Vehar, L. I. Lorence, R. L. Westfall, S. C. Jones, I. A. Sweet. Characterization of a two dimensional, thermoluminescent, dose-mapping system: uniformity, reproducibility, and calibrations. Rev. Sci. Instrum. 65 (10) (1994) 3243–3251.
2. M. Topaksu, V. Correcher, J. Garcia-Guinea. Luminescence emission of natural fluorite and synthetic CaF2: Mn (TLD-400). Radiat. Phys. Chem. 119 (2016) 151-156.
3. M. Danilkin, A. Lust, A. Ratas, V. Seeman, M. Kerikmäe. Afterglow kinetics and storage mechanism in CaF2: Mn (TLD-400). Radiat. Meas. 43 (2008) 300-302.
4. A. N. Yazici, M. Bedir, A. S. Sökücü. The analysis of dosimetric thermoluminescent glow peak of CaF2: Mn after β-irradiation. Nucl. Instr. and meth. B. 259 (2) (2007) 955-965.
5. R. J. Ginther, R. D. Kirk. The Thermoluminescence of CaF2: Mn. J. Electrochem. Soc. 104 (6) (1957) 365-369.
6. M. Danilkin, A. Lust, M. Kerikmäe, V. Seeman, H. Mändar, M. Must. CaF2: Mn extreme dosimeter: Effects of Mn concentration on thermoluminescence mechanisms and properties. Radiat. Meas. 41 (6) (2006) 677- 681.
7. H. E. Wang, P.S. Weng, P.C. Hsu. An annealing treatment for eliminating residual dose in CaF2:Mn. Nucl. Instr. and meth. B. 103 (1) (1995) 73-78.
8. L. A. R. Da Rosa, H. P. Nette, Thermoluminescent dosimeters for exposure assessment in gamma or x radiation fields with unknown spectral distribution. Appl. Radiat. Isot. 39 (3) (1988) 191-197.
9. S. Akbari, S. Harooni, M. Zahedifar. Recovery of thermoluminescence sensitivity in CaF2: Mn (TLD-400) dosimeter under heating process, Iran. J. Radiat. safety Meas. 7 (3) (2019) 9-12.
10. G. Kitis, J. M. Gomez-Ros, J. W. N. Tuyn. Thermoluminescence glow-curve deconvolution functions for first, second and general orders of kinetics, J. Phys. D: Appl. Phys. 31 (1998) 2636-2641.
11. H. G. Balian, N. W. Eddy. Figure of merit (FOM), an improved criterion over the normalized chi-squared test for assessing goodness of fit of gammaray spectra peaks. Nucl. Instr. Meth. 145 (2) (1977) 389-395. 

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