Natural Radiation
Humans are primarily exposed to natural radiation from the sun, cosmic rays, and naturally occurring radioactive elements found in Earth's crust. Cosmic rays from space include energetic protons, electrons, gamma rays, and X-rays.
The primary radioactive elements found in Earth's crust are uranium, thorium, and potassium, and their radioactive decay products. These elements emit alpha particles, beta particles, and gamma rays. The decay of naturally occurring radium produces radon gas, which emanates from the ground. Radon gas is a major source of radiation exposure.
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