Radiation — Nuclear

High-energy waves that require thick lead or concrete to block.

Heavy and slow; can be stopped by a sheet of paper but dangerous if inhaled or swallowed. Nuclear radiation

At its simplest, nuclear radiation is energy released by unstable atoms as they transition to a more stable state. This energy typically takes the form of high-speed particles or electromagnetic waves, often referred to as because it has enough energy to knock electrons off atoms. The four primary types are: High-energy waves that require thick lead or concrete