Comes from unstable isotopes in food, air, building materials, rocks, cosmic rays, fall out from.
The level of background radiation changes depending on where you are:
- High altitudes mean more exposure to cosmic rays.
- Underground mines due to rocks surrounding you.
- Rocks such as granite and Radon gas getting trapped in peoples homes.
Radon gas:- exposure= more lung cancer, low concentration= safe, 1/20 lung cancer deaths are because of Radon gas, more harmful than smoking, but new homes are being built with better ventilation to help stop the build up of it in high concentrations at home.
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