What is alpha decay made of?
An alpha particle can be thought of as a helium nucleus,
“Alpha decay” is the spontaneous fission of an atomic nucleus that releases an “alpha” particle.
There are three main nuclear fission (radioactivity) particles – alpha, beta, and gamma. Alpha particles are really just helium atoms ejected at high velocity. Beta particles are electrons or positrons, and a gamma particle is a high-energy photon.