Kinetic study of the thermoluminescence of KMgF3:LaF3 compounds employing the general one trap model.
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-T(stop) 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.
Caselli
E
E
IFAS, Universidad del Centro de la Provincia de Buenos Aires, Pinto 399, 7000 Tandil, Argentina. ecaselli@exa.unicen.edu.ar
Furetta
C
C
Molina
P
P
Santiago
M
M
Spano
F
F
Lester
M
M
D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005459:Fluorides / Q000737:chemistry* / Q000528:radiation effects*; D007700:Kinetics; D007811:Lanthanum / Q000737:chemistry* / Q000528:radiation effects*; D017616:Magnesium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D008956:Models, Chemical; D010758:Phosphorus / Q000737:chemistry / Q000528:radiation effects; D011188:Potassium / Q000737:chemistry / Q000528:radiation effects; D011829:Radiation Dosage; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation* / Q000379:methods*
D017616:Magnesium Compounds; C083668:lanthanum trifluoride; D010758:Phosphorus; C031288:magnesium fluoride; D007811:Lanthanum; D005459:Fluorides; D011188:Potassium