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双能γ射线吸收法是一种检测弥散燃料元件铀均匀性的新方法。实验选用75Se多能谱γ射线源中的2个分支比较高的能量136、264 ke V进行测试;选用高纯锗(HPGe)探测器进行γ射线探测。根据U、Zr的γ射线衰减系数差异在136 ke V能量下远大于264 ke V能量的特性,测定U-Zr弥散燃料芯体中的U、Zr含量和均匀性。实验使用有机玻璃瓶罐装U粉末、Zr粉末制作标准样进行吸收系数标定,使用“迭代法”对方程进行求解。最终结果显示测试相对精度为±5%,满足大多数工程应用要求。
Dual-energy γ-ray absorption method is a new method to detect uranium homogeneity of dispersed fuel elements. Two branches in the 75Se multi-spectral gamma-ray source were selected to test with a relatively high energy of 136,264 keV. A high-purity germanium (HPGe) detector was used for γ-ray detection. The U, Zr content and uniformity in U-Zr dispersed fuel cores were determined according to the difference of the γ-ray attenuation coefficient between U and Zr far greater than 264 ke V energy at 136 keV energy. The experiment uses the plexiglass bottle canned U powder, Zr powder standard sample absorption coefficient calibration, using the “iterative method” to solve the equation. The final result shows that the test relative accuracy is ± 5%, meeting the requirements of most engineering applications.