参数法测量放射性活度

4πβ-γ（HPGe） Method for Activity Measurement

摘要: 用HPGe探测器替代传统4πβ-γ符合装置中的NaI（Tl）探测器，对γ射线进行精细测量。选取一组适当的γ射线进行符合或反符合测量，计算出较为准确的β效率，从而简单地得到待测核素的放射性活度。¹³³Ba和131I活度的实验测量结果表明，4πβ-γ（HPGe）参数法是1种准确、可靠的放射性活度测量方法。

Abstract: The 4πβ-γ（HPGe） method for activity measurement was described. The HPGe detector is taken to replace the NaI（Tl） detector in the usual 4πβ-γ system, which can detect γ-ray more accurately. With proper selection of γ-ray, the approach can simply determine activity. With the measurements of 133Ba and ¹³¹I, it is concluded that the 4πβ-γ（HPGe） anticoincidence method is an accurate and credible method for activity measurement.