So based on my very specific training in nuclear reactors... we had
photons aka EM Radiation sometimes called xrays depending on the frequency
Alpha PARTICLES
Beta particles
and Neutrons
the rest of the shit is too rare and theoretical to cause harm such as Positrons and anti-protons, because even when they occur they pair annihilate the second they come in contact with an electron or proton.
Beta particles are stopped/shielded by your clothing. Its a hydrogen atom that had its electron stripped. +1 charge.
an Alpha particle is a helium atom with its electrons stripped. It is stopped/shielded by the dead layer of your skin. +2 charge.
The only time an Alpha particle is a health risk is when a nucleide such as Radon experiences Alpha decay, while inside your lungs. The same thing can occur with smoking tobacco products too. Otherwise Alpha particles, outside your lungs, are mostly harmless.