The analysis of dosimetric thermoluminescent glow peak of CaF2:Mn after β-irradiation

Abstract

The additive dose (AD), Tm(Ea)–Tstop, repeated initial rise (RIR), peak shape (PS) and computerized glow curve deconvolution (CGCD) methods were used to analyze the thermoluminescent (TL) dosimetric glow peak of CaF2:Mn after β-irradiation between the dose level D=0.015Gy and D=110Gy. The PS, Ea–Tstop and CGCD methods indicate that the glow curve is not a single peak but is the superposition of more than one glow peak. The CGCD and Ea–Tstop methods indicate that the dosimetric peak of this material is the superposition of at least five glow peaks, which were referred to as P1–P5. The dose variation experiment indicates that all of them are of first-order kinetics. The activation energies found with the IR and PS methods yield very close values after the cleaning of low temperature satellite peaks from the dosimetric glow peak by increasing the stopping temperature in the Tm–Tstop experiment. On the other hand, there is no agreement between the results of all the applied methods before the application of the Tm–Tstop experiment. The Ea–Tstop plot indicates that the efficiency of thermal quenching effect on this sample is effective above 300°C. This parameter has also pronounced effects on the evaluated kinetic parameters of the dosimetric peak. The influence of heating rates on the response of dosimetric glow peak of CaF2:Mn was also studied by the peak height and peak area methods using CGCD technique. It was observed that the peak intensities and total area of glow peak decrease continuously with increasing heating rate. Another dosimetric characteristic which is the dose response of this peak was also examined by peak height and area methods.