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在束流能量为150MeV的前提下计算了中子产额对铅靶尺寸的依赖性．选择某一靶尺寸后讨论了靶系统的放射性活度随时间的变化．最后则比较了不同靶尺寸下的中子能谱．
Under the premise of beam energy of 150MeV, the dependency of the neutron yield on the size of lead target was calculated. After selecting a target size, the changes of the target system’s radioactivity over time are discussed. Finally, we compare the neutron energy spectra of different target sizes.