用反符合方法测量<sup>131</sup>I和<sup>133</sup>Ba的比活度

用反符合方法测量¹³¹I和¹³³Ba的比活度

摘要: ¹³¹I是核医学应用中较为重要的核素之一；¹³³Ba是1种电子俘获核素，对HPGe γ谱仪能量刻度和效率校准具有重要意义。利用4πβ(PPC)-γ(HPGe)反符合测量装置对上述两种核素的活度进行了反符合测量方法研究，所得到的比活度测量结果分别为1 794.8（1±0.6%）kBq•g^-1（k=1）和502.8•（1±0.6%）kBq•g^-1（k=1），与归一到相同参考时刻4πβ(PC)-γ(NaI(Tl))符合效率外推法的测量结果1 797.6（1±0.5%）kBq•g^-1（k=1）和504.9（1±0.6%）kBq•g^-1（k=1）均在不确定度范围内一致。

Abstract: ¹³¹I is a very important nuclide applied in nuclear medicine. ¹³³Ba, an EC decay nuclide, plays a significant role in the efficiency calibration of HPGe detector. The activity measurement method for the above two kinds of nuclides was studied by the 4πβ(PPC)-γ(HPGe) anti-coincidence counting. The specific activity measurement result for 131I sample is 1 794.8（1±0.6%）kBq•g^-1（k=1）and for 133Ba is 502.8（1±0.6%）kBq•g^-1(k=1). Compared with the results measured by 4πβ(PC)-γ(NaI(Tl)) coincidence efficiency extrapolation methods at the same reference time, 1 797.6（1±0.5%）kBq•g^-1（k=1）and 504.9（1±0.6%）kBq•g^-1（k=1）, it is in good agreement within the uncertainties.