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Radiation Protection Dosimetry Advance Access originally published online on June 9, 2006
Radiation Protection Dosimetry 2006 119(1-4):148-152; doi:10.1093/rpd/nci648
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Published by Oxford University Press (2006)

Kinetic study of the thermoluminescence of KMgF3:LaF3 compounds employing the general one trap model

E. Caselli1,2,*, C. Furetta3, P. Molina1,5, M. Santiago1,5, F. Spano4 and M. Lester1,5

1 IFAS, Universidad del Centro de la Provincia de Buenos Aires, Pinto 399, 7000 Tandil, Argentina
2 Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, calle 526 entre 10 y 11, 1900 La Plata, Argentina
3 Physics Department, Rome University ‘La Sapienza’, Piazzale A. Moro 2, 00187 Rome, Italy
4 Autoridad Regulatoria Nuclear, Avenue Del Libertador 8250, 1429 Buenos Aires, Argentina
5 Consejo Nacional de Investigaciones Científicas y técnicas (CONICET), Rivadavia 1917, 1033 Buenos Aires, Argentina

* Corresponding author: ecaselli{at}exa.unicen.edu.ar

The parameters characterising the trap centres involved in the thermoluminescence of KMgF3:LaF3 compounds have been found by deconvolving the glow curve with the General One Trap model (GOT). For the fitting procedure the Levenberg–Marquardt method has been employed. Tm–Tstop measurements along with initial rise measurements were performed in order to estimate the number of peaks the glow curve is made up of, and the corresponding activation energies. Instead of the Runge–Kutta method, a novel algorithm has been employed to integrate the differential equation of the GOT model, which reduces the computational time nearly 30 times with respect to the former when the glow curve is recorded with a lineal heating rate profile. The strong computational time reduction makes feasible a large number of runs with different guess values. An interesting result is that the concentration of disconnected deep traps is much less than the concentration of trap centres.


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