Understanding Radiation

Millisieverts, becquerels, and live radiation maps — the basics you need to put any radioactivity number in context.

From national monitoring networks to citizen-science maps — these sites show the radioactivity around you in real time.

Becquerels count decays, sieverts measure effect — keep those two apart and you can decode any radiation headline. With an everyday comparison scale.

Tobacco smoke contains radioactive polonium-210 and lead-210. Why smokers' lungs absorb a substantial radiation dose.