Which one is the strongest one alpha betta or gamma?

all three are very different.

Alptha is very small particles that are radioactive like dust to sand grains size.

Betta are slightly bigger and give off radiation. betta is whats in x ray machines and basically anything with a radiation symbol on it.

gamma is just radiations and is not a solid object and is what comes off of alpha and betta.

there is another called Neutron but this is only present after a nuclear bomb and cannot be detected from Alpha, Betta or gamma.