Abstract
Polycrystalline powder samples of dysprosium doped Zn(BO 2) 2 phosphors were prepared by solid state reaction in air at high temperature and characterized by X-ray powder diffraction. The IR, Photoluminescence (PL), diffuse reflectance and three-dimensional (3D) thermoluminescence (TL) emission spectrum after 60Co gamma ray irradiation were investigated. The characteristic 3D TL emission bands at about 425, 481 and 573 nm with a main emission band of around 573 nm were attributed to the host emission, 4F 9/2 → 6H 15/2 and F 9/2 → 6H 13/2 f-f transitions of Dy 3+ ions. No emission from Dy 2+ ions was observed in the measurement wavelength range. The TL-dose response of the Zn(BO 2) 2:Dy polycrystalline powder sample to gamma ray radiation in the range from 1 to 100 Gy at clinical dose levels was almost linear. The experimental results showed that Zn(BO 2) 2:Dy had potential use as the materials of gamma-ray thermoluminescence dosimeter (TLD) for clinical dosimetry.
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