A boron-doped alumina (Al₂O₃:B) dosimeter was developed for thermal neutron dosimetry. The Al₂O₃:B was synthesized by a sol-gel method, and annealed up to 1200°C. The ratio of B to Al in the Al₂O₃:B was 0.1. For X-ray diffraction (XRD) analysis, the diffraction pattern of the Al₂O₃:B at 500°C had broad reflex peaks corresponding to the crystalline structure of γ-Al₂O₃. The XRD pattern at 1200°C had reflex peaks corresponding to the crystalline structures of α-Al₂O₃ and Al₁₈B₄O₃₃. The optically stimulated luminescence (OSL) property of the Al₂O₃:B had satisfactory linearity in X-ray dose measurement.
  Several type dosimeters, Al₂O₃, Al₂O₃:B, and Al₂O₃:B with Cd foils, were set in a thermal neutron field. It was confirmed from their responses that the response of Al₂O₃:B was originated from ¹⁰B(n,α) ⁷Li reactions.

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