KINETIC STUDY OF THE THERMOLUMINESCENCE OF KMgF3:LaF3 COMPOUNDS EMPLOYING THE GENERAL ONE TRAP MODEL

E. CASELLI; F. FURETTA; P. MOLINA; M. SANTIAGO; F. SPANO; M. LESTER

RADIATION PROTECTION DOSIMETRY

Oxford University Press

Año: 2006 p. 1 - 4

0144-8420

The parameters characterising the trap centres involved in the thermoluminescence of KMgF3:LaF3 compounds have beenfound 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 orderto estimate the number of peaks the glow curve is made up of, and the corresponding activation energies. Instead of theRunge–Kutta method, a novel algorithm has been employed to integrate the differential equation of the GOT model, whichreduces the computational time nearly 30 times with respect to the former when the glow curve is recorded with a lineal heatingrate profile. The strong computational time reduction makes feasible a large number of runs with different guess values. Aninteresting result is that the concentration of disconnected deep traps is much less than the concentration of trap centres