O. Miller, Content Optimization Executive, Studied Journalism and Psychology, Austin,Texas
Answered May 10, 2019
Alpha radiation or alpha particles contain two neutrons and two protons that are also known as the helium-4 nuclei. Due to their combined mass and their charges, they have a strong interaction with matter. Their velocities can only penetrate a sheet of paper up to two-centimeter cardboard.
This radiation cannot penetrate the outer dead skin cell layers; thus it cannot damage the live tissues underneath it. Though this radiation might not cause harm to people on Earth, this can be dangerous to astronauts as the magnetic field of the Earth deflects them. This can be extremely harmful to Earthlings when they have inhaled or ingested radioisotopes that emit alpha radiation.