Abstract
Polycrystalline powder samples of terbium doped Zn(BO 2) 2 phosphors were prepared by solid state reaction in the thermal carbon reducing atmosphere at high temperature. The photoluminescence (PL), three-dimensional (3D) TL emission spectrum and dosimetric characteristics following 60Co gamma-rays irradiation were studied. Characteristic emission bands of Tb 3+ at about 490, 543, 584 and 620 nm, attributed to the 5D 4→ 7F J ( J=3, 4, 5, 6) transitions of Tb 3+ ions, were observed in the TL and PL emission spectrum. No emission from Tb 4+ ions was observed in the TL emission spectrum. The TL-dose response of the powder samples Zn(BO 2) 2:Tb to 60Co gamma-rays radiation in the dose range from 1 to 100 Gy for clinical dose levels was almost linear. The experiment results showed that Zn(BO 2) 2:Tb has potential use as the materials of gamma-rays thermoluminescence dosimeter (TLD) for clinical dosimetry.
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