The first type of radiation is Alpha radiation. Alpha radiation is pretty much a stream of positively charged particles which are also known as alpha particles. Alpha particles have an atomic mass of for and a charge of +2, which is actually a helium nucleus. Alpha radiation is the weakest of all radiation, it can be stopped by things like paper and clothing.
The next type of radiation is Beta radiation. Beta radiation is a stream of electrons, which are known as beta particles. Beta radiation can be stopped by things like wood. When a beta particle ejects a neutron in the nucleus turns into a proton which causes the atomic number of the element to increase by one.
The third type of radiation is Gamma radiation. It is the strongest type of radiation and can only be stopped by a thick wall of lead or concrete. Gamma rays are high-energy photons. Gamma emission does not change the atomic number or the atomic mass. Whenever gamma emission occurs it is usually accompanied by alpha and beta emission as well.
Here is a diagram of the strength of the different types of radiation:
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