期刊
JOURNAL OF RARE EARTHS
卷 26, 期 2, 页码 203-206出版社
ELSEVIER
DOI: 10.1016/S1002-0721(08)60065-4
关键词
thermoluminescence; dysprosium; dosimetry; zinc metaborate; gamma-ray; rare earths
Polycrystalline powder samples of dysprosium doped Zn(BO2)(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 Co-60 gamma ray irradiation were investigated. The characteristic 3D TL emission bands at about 425, 481 and 573 rim with a main emission band of around 573 nm were attributed to the host emission, F-4(9/2) -> H-6(15/2) and F-9/2 -> H-6(13/2) f-f transitions of Dy3+ ions. No emission from Dy2+ ions was observed in the measurement wavelength range. The TL-dose response of the Zn(BO2)(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(BO2)2:Dy had potential use as the materials of gamma-ray thermoluminescence dosimeter (TLD) for clinical dosimetry.
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