The radioactive fission products in these vapors eventually decay into stable elements.

这些蒸汽中的放射性裂变物质会最终衰退成稳定元素。

The irradiated fuel is a mix of uranium that failed to fission, fission products, and plutonium, a radioactive material not found in nature.

辐射性燃料是由裂变失败的铀，裂变过的铀，和一种自然中不存在的 放射性钚混合而成的。

Compared to its more abundant cousin, a strike by a neutron easily splits the U-235 nuclei into lighter, radioactive elements called fission products, in addition to two to three neutrons, gamma rays, and a few neutrinos.

与它的近亲相比，中子的撞击很容易 将铀 - 235的原子核分成更轻的，叫做 裂变产物的放射性元素，两到三个中子，伽马射线，和一些中微子。