Abstract
In this study, we fabricated Dy3+-doped Li2O–CaO–P2O5 glasses using 6Li or nLi (nLi: containing 6Li or 7Li isotopes in natural abundance) to develop a new thermoluminescent material for neutron detection. Their thermoluminescence (TL) properties were investigated using X-ray and thermal neutron irradiation. TL glow peaks were observed at 366 K after X-ray irradiation, and the observed TL intensities of the nLi and 6Li glasses were similar, indicating that these materials have similar sensitivities to X-rays. A TL glow peak was observed at between 373 K and 400 K after neutron irradiation, and the TL intensities of the 6Li glass were significantly higher than those of the nLi glass, indicating that high-energy particles generated in the 6Li (n, α)3H reaction efficiently induced TL. The thermal neutron fluence and TL intensity derived from the 6Li (n, α)3H reaction in the neutron fluence range of 1.0 × 106–1.0 × 1011 neutrons/cm2 showed good linear correlation. These glasses are expected to be applied in TL dosimetry for X-rays, gamma rays, and thermal neutrons.
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