radiation cross-section

例句：

1. 1. The radiationcross-section of the material is very low.
   这种材料的辐射截面非常低。
2. 2.The attenuation cross-section of the beam is measured to ensure its safety.
   测量光束的衰减截面以确保其安全性。
3. 3.The cross-sectional area of the beam is important for calculating its energy distribution.
   光束的横截面积对于计算其能量分布非常重要。