But radiation itself is invisible.
The nuclei of some substances will decay, releasing rays that we can't see or feel with our naked eyes, which can only be detected with special instruments. This property of matter is called radioactivity. Radioactive substances are those that can naturally radiate energy and emit rays. Generally, it is a metal with a large atomic weight, such as plutonium and uranium. There are three kinds of rays emitted by radioactive materials, namely alpha rays, beta rays and gamma rays.
Chinese name
Radioactive material
research objects
chemistry
danger
It is harmful to health.
kind
Alpha rays, beta rays and gamma rays