No abstract

The thermoluminescent (TL) properties such as glow curve structure, relative thermoluminescence sensitivity, dose response linearity of lithium fluoride thermoluminescent dosimeters 6LiF:Ti,Mg (TLD-600) and 7LiF:Ti,Mg (TLD-700) are investigated after irradiation 252Cf neutron+gamma and 90Sr-90Y beta sources at room temperature and then the obtained results are compared. The kinetic parameters, namely the order of kinetics b, activation energy and the frequency factor s, are calculated using the computerized glow curve deconvolution (CGCD) program. The effect of heating rate on the glow curves of dosimeters is also investigated. The maximum TL peak intensities and the total area under the glow curves decrease with the increasing heating rate. There is no agreement with the kinetic parameters calculated by the CGCD program for both radiation sources.

In this study, thermoluminescence characteristics of un-doped and Dy-doped calcium tetraborate (CaB 4 O 7 ) compounds are reported. The polycrystalline powder samples of un-doped and Dy-doped CaB 4 O 7 were prepared by a solid-state reaction at high-temperature method. The identification and characteristics of the obtained compounds were determined by X-ray diffraction, Fourier transform infrared analysis, differential thermal analysis, thermogravimetric analysis, and scanning electron microscopy. The glow curves were obtained using a thermoluminescent reader. Neutron sensitivity, dose-response, and heating rate of CaB 4 O 7 compounds were determined by using a bare 252 Cf mixed neutron ? gamma (n ? c) source, and dose response results are compared to those of Harshaw TLD-600 and TLD-700 neutron dosimeters ( 6 LiF:Mg,Ti and 7 LiF:Mg,Ti). The sensitivity of CaB 4 O 7 :Dy (0.5%) sample is approximately 4.35 and 3.36 times higher than that of TLD-600 and TLD-700, respectively.