提出了活化法测量DD中子产额的实验方法，该方法可提高DD中子产额测量的精度。方法基于铟同位素115In与DD中子的非弹性散射反应，活化反应释放的γ射线被HPGe探测器记录，根据活化系统标定灵敏度推算出中子产额。分析了探测器记录的活化γ射线数与中子产额间的关系。介绍了一套活化测量的系统设计。通过蒙特卡罗方法模拟了活化样品出射的γ射线数与样品厚度的关系，模拟结果表明：样品厚度取为1 cm可兼顾活化效率和测量精度。在加速器上对铟活化样品进行了标定实验，实验结果表明：在聚变中子产额大于2×109的实验中可使用铟活化诊断方法，中子产额测量的相对标准误差在10%以内。随着聚变中子产额的不断提高，铟活化测量中子产额的精度可进一步提高。

The measurement of DD neutron yield by activation is presented. This method is based on the inelastic scattering reaction of 115In with DD neutron, and the activated γ spectrum is counted by HPGe detector. The relation between the counts of detected γ rays and the neutron yield is analyzed. The optimal thickness of sample is given by Monte Carlo simulation, which is 1 cm. The entire counting system has been calibrated on the K-400 accelerator. The result shows that the DD neutron measurement by indium activation can be used in the ICF experiment when the neutron yield is above 2×109. The total error of the system is below 10% in this condition. The total error will reduce when the neutron yield is larger.