1)  γanti-scattering
γ反散射
1.
Firstly, the measurement ofγanti-scattering method is selected and the mapping relations and mathematical model are built for further relationship study of interactions betweenγray and materials.

2)  γ-back
γ-反散射法
1.
With γ-back scattering method as the non-destructive quality control over the density of bituminous concrete, this article analysed the optimum work conditions and interferingfactors of assembled instrument, and corrected them before the practical stage.

3)  γ-ray back-scattering
γ射线反散射
1.
This paper described the principles,structure and calibration method of the portable isotopic coal analyzor based on the isotopic technology of ash determination with γ-ray back-scattering method,and introduced the structure and characteristics of software and hardware of the upper and the lower part of the analyzor.

4)  γ-ray Compton back-scattering
γ射线康普顿反散射
5)  portable gamma backscatter thickness meter

6)  gamma backscattering thickness gauge
γ反向散射测厚仪

 弹性散射和非弹性散射elastic scattering and inelastic scattering    使用粒子间碰撞来研究粒子的性质、相互作用和内部结构的两种情况。如果碰撞过程中两粒子间只有动能的交换，粒子类型、其内部运动状态和数目并无变化，则称为弹性散射或弹性碰撞。如果碰撞过程中除了有动能交换外，粒子的数目、类型和内部状态有所改变或转化为其他粒子，则称为非弹性散射或非弹性碰撞。   散射过程的研究对于了解许多物理现象具有很重要的意义。例如E.卢瑟福对a粒子被物质散射的研究，提出原子的有核模型；J.弗兰克和G.L.赫兹的电子与原子碰撞实验证实了N.玻尔的定态假设；建造高能加速器就是利用被加速粒子的散射过程来研究粒子的性质、相互作用和相互转化的规律。60年代末到70年代初利用高能轻子对质子和中子的深度非弹性散射的实验，发现质子和中子内部存在点状结构。