Effects of Gamma and Beta Radiations to Dosimeters Fabricated from K₂YF₅ and K₂GdF₅

K₂YF₅ and K₂GdF₅ doped with rare earth can be used as thermoluminescent (TL) dosimeters for gamma, beta radiations. In this study, the K₂YF₅ and K₂GdF₅ doped with Tb, Pr, Sm, and Dy with different concentrations were synthesized by solid state reaction method. These double fluoride dosimeters were irradiated with different radiations, namely beta and gamma. The study results showed that in general, the TL intensity of K₂GdF₅ is higher than that of K₂YF₅. The K₂GdF₅ crystals doped with Tb³⁺, Pr³⁺ have very high TL sensitivities. But the sensitivities of Sm³⁺, Dy³⁺ doped-are very low. The TL glow curve of K₂YF₅:Tb consists of three peaks at temperatures 132^oC, 207^oC and 240^oC, and its intensities are approximately. The TL glow curve of K₂GdF₅:Tb has dosimetric peak at the temperature 196^oC (heating rate 2^oC/s), the temperature of this peak suitable for dosimetry application. The TL sensitivity of K₂GdF₅:Tb is higher than that of TLD-100 and TLD-900 dosimeters for the gamma and beta radiation. The dosimeters K₂GdF₅:Tb has high sensitivity and linearity for gamma, beta radiations. In addition, the thermal fading effect of TL intensity was very low. The study results showed that these materials can be used in nuclear radiation dosimeters. (author)