在线式多球中子谱仪球球干扰模拟研究

Simulation Research on Sphere-Sphere Disturbance of On-Line Bonner Sphere Spectrometers

为降低在线式多球中子谱仪在测量中同时使用多个慢化球时由于球球干扰导致的测量误差,利用MCNP程序模拟了干扰球半径、探测球半径、球球距离3个因素对球球干扰的影响。综合模拟与实际测量结果,设计了一套慢化球放置方案。实验验证表明:该套方案可将干扰降至可接受水平,可为在线式多球中子谱仪的研制提供理论支持和数据参考。

To reduce the error of measurement that the sphere -sphere disturbance caused when the on -line Bonner sphere spectrometers use many slow - sphere in the measurement,this thesis uses MCNP to simulate the impact on sphere - sphere disturbance of three factors of disturb - sphere radius, detect - sphere radius, dis- tance of sphere - sphere, and make a synthesis of simulation and actual measurement results and design a plan of placing slow - sphere . The results show that this plan can reduce the sphere - sphere disturbance to an ac- ceptable level and also can provide the design of on - line Bonnet sphere spectrometers with theoretical support and data reference.