DISTINGUISHING BETWEEN NEUTRON AND GAMMA INTERACTIONS IN 6LI-CONTAINING CRYSTALS
Haley Tibbs, Brenden Wiggins.
Vanderbilt University, Nashville, TN.
The need for radiation detectors for neutron science and homeland security over the past decade have led to great interest in materials for neutron detection. This project aims to study different radiation interactions in 6LiInSe2, a promising semiconducting crystal for neutron detection. In order to minimize unwanted neutron capture reactions with 115In and improve the overall detection efficiency, a series of 6Li-containing crystals were fabricated whereby the indium component was systematically replaced by gallium—6LiInSe2, 6LiIn0.8Ga0.2Se2, 6LiIn0.6Ga0.4Se2, 6LiIn0.5Ga0.5Se2, 6LiIn0.4Ga0.6Se2, 6LiIn0.2Ga0.8Se2, and 6LiGaSe2. The generated samples were characterized by differential scanning calorimetry (DSC), I-V, UV-VIS, and infrared spectroscopy to determine phase transition points, electrical resistivity, and light transmission. Radiation measurements were performed with a 137Cs gamma ray source and a moderated 252Cf thermal neutron source. Crystals were fabricated such that they could either operate as a semiconductor, whereby the 6Li (n,α) reaction results in current generation, or as a scintillator, where the nuclear reaction generates photons. The results will be presented.