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Abstract: Polycrystalline powder sample of KSr4(BO3)3 was synthesized by high-temperature solid-state reaction. The influence of different rare earth dopants, i.e. Tb3+, Tm3+ and Ce3+, on thermoluminescence (TL) of KSr4(BO3)3 phosphor was discussed. The TL, photoluminescence (PL) and some dosimetric properties of Ce3+-activated KSr4(BO3)3 phosphor were studied. The effect of the concentration of Ce3+ on TL intensity was investigated and the result showed that the optimum Ce3+ concentration was 0.2mol%. The TL kinetic parameters of KSr4(BO3)3:0.002 Ce3+ phosphor were calculated by computer glow curve deconvolution (CGCD) method. Characteristic emission peaking at about 407 and 383nm due to the 4f05d1 → 2F(5/2, 7/2) transitions of Ce3+ ion were observed both in PL and three-dimensional (3D) TL spectra. The dose–response of KSr4(BO3)3:0.002 Ce3+ to γ-ray was linear in the range from 1 to 1000mGy. In addition, the decay of the TL intensity of KSr4(BO3)3:0.002 Ce3+ was also investigated. [Copyright &y& Elsevier]

Abstract: Polycrystalline powder samples of terbium doped Zn(BO2)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 Tb3+ at about 490, 543, 584 and 620nm, attributed to the 5D4→7F J (J=3, 4, 5, 6) transitions of Tb3+ ions, were observed in the TL and PL emission spectrum. No emission from Tb4+ ions was observed in the TL emission spectrum. The TL-dose response of the powder samples Zn(BO2)2:Tb to 60Co gamma-rays radiation in the dose range from 1 to 100Gy for clinical dose levels was almost linear. The experiment results showed that Zn(BO2)2:Tb has potential use as the materials of gamma-rays thermoluminescence dosimeter (TLD) for clinical dosimetry. [Copyright &y& Elsevier]