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Thermoluminescence properties of isostructural K2YF5 and K2GdF5 crystals doped with Tb in response to α, β and X-ray irradiation |
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| Authors: | Huynh Ky Hanh Vladimir N Makhov Nguyen Trong Thanh |
| Affiliation: | a Nhatrang Institute of Technology Research and Application, 02 Hungvuong St., Nhatrang City, Viet Nam b Kurnakov Institute of General and Inorganic Chemistry, Leninskii Prospect 31, 119991 Moscow, Russia c P.N. Lebedev Physical Institute, Leninskii Prospect 53, 119991 Moscow, Russia d Institute of Materials Science, 18 Hoang Quoc Viet Rd., Hanoi, Viet Nam |
| Abstract: | The thermoluminescence (TL) properties of isostructural fluoride K2YF5 and K2GdF5 crystals doped with Tb3+ of different concentrations have been studied in the temperature range from 30 to 500 °C after α, β and X-ray irradiation. Strongly different structures of TL glow curves following α or β irradiation have been found for Tb3+ doped K2YF5 for all studied concentrations of Tb3+ whereas for K2GdF5 crystals the different TL curves after α or β irradiation are detected only for heavily doped samples. On the other hand, all the studied materials show similar TL glow curves after β or X-ray irradiation. It has been discovered that K2YF5 doped with 1 at.% Tb3+ has TL radiation sensitivity to β irradiation of the same order as that of the well known TLD-100 (LiF:Mg,Ti) phosphor and much higher sensitivity to α irradiation. The TL mechanism in K2YF5 and K2GdF5 doped with Tb3+ is discussed by taking into account the TL emission spectra from irradiated samples, which are identical to the emission spectra of the Tb3+ ions in these hosts under photo-excitation, and the kinetics parameters obtained with the method of various heating rates. |
| Keywords: | Thermoluminescence Complex yttrium and gadolinium fluorides Trivalent terbium Thermoluminescent dosimetry |
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