Alpha radiation was first detected in the late 19th century by Ernest Rutherford. Alpha radiation is the release of two protons and two neutrons with many millions of electron volts of kinetic energy! Alpha radiation is very positivity charged and cannot readily move more than a few centimeters from a source before tuning into normal helium. As a result, alpha radiation is only dangerous when inhaled, ingested, or otherwise allowed into the body.
Three more videos are coming!
Beta Radiation, Geiger Counters 101 Part Three
Gamma and X-Ray Radiation, Geiger Counters 101 Part Four
Radiation Math, Geiger Counters 101 Part Five