In this article, K2GdF5 substance was doped by various Tb3+ ion with concentrations 2, 5, 10, 15, 20 mol%, and the materials were synthesized by the solid state reaction method. The K2GdF5 material had orthorhombic structure of Pnam symmetry with the wrinkled surface structure shown on SEM images. | Vietnam Journal of Science and Technology 56 (1A) (2018) 102-109 STUDY ON THERMOLUMINESCENCE PROPERTIES OF K2GdF5:Tb3+ Ha Xuan Vinh1, *, Nguyen Chi Thang1, Doan Phan Thao Tien1, Tran Hoan Vu2 1 Nhatrang Institute of Technology Research and Application, VAST, 02 Hung Vuong street, Nha Trang, Khanh Hoa, Viet Nam 2 Tran Phu High School, Phu Yen Department of Education and Training, 30 Tran Ria Street, Tuy An, Phu Yen, Viet Nam * Email: vinhhx@ Received: 15 August 2017; Accepted for publication: 25 February 2018 ABSTRACT In this article, K2GdF5 substance was doped by various Tb3+ ion with concentrations 2, 5, 10, 15, 20 mol%, and the materials were synthesized by the solid state reaction method. The K2GdF5 material had orthorhombic structure of Pnam symmetry with the wrinkled surface structure shown on SEM images. The fluorescence spectrum indicated that the luminescence property of this material was due to the Tb3+ ions. In the thermoluminescence (TL) investigation, the glow curves of K2GdF5:Tb3+ owned three peaks at 196, 236 and 305 °C when measuring at 2 °C/s heating rate, the main peak (at 196 oC) could be used to determine the dose by the TL method. The sensitivity, linearity and responsivity to different radiation doses of materials were also examined. In addition, some of the thermoluminescence responses of materials with neutron doses were also investigated. The results showed this materials own thermoluminescence properties, which could be applied in measuring nuclear radiation including neutron doses. Keywords: K2GdF5:Tb3+, neutron dosimetry. 1. INTRODUCTION Nowadays, the neutron sources have been widely used in many fields of material study, nuclear reaction, radiotherapy etc., thus it has required the development of neutron dosimetry methods, especially with accumulated neutron doses. However, until now, there are only a few studies about measuring the dose of the neutron by the thermoluminescence (TL) method, therefore, the investigation
