Some of these gamma rays pass near atomic nuclei, in the process transforming into an electron and a positron, researchers said.
某些伽马射线在靠近原子核的附近经过，进入到转化为个电子和正电子的过程，研究人员说。
2
Electron beams and X-ray accelerators can both be used to irradiate various shapes and sizes of food, although X-rays are better at penetrating large items.
电子束和X光加速器都可以用来辐照各种不同形状和大小的食品，不过X光穿透大型食品的能力更佳。
3
Food is irradiated by brief exposure to X-rays, gamma rays or an electron beam.