Radon · The Radioactive Gas from Rock
unseel.com · ²²&sup6;Ra → ²²²Rn · alpha decay · noble gas
Half-life 3.82 days
α energy 5.49 MeV
phase
²²&sup6;Ra in rock
²²²Rn gas
α particle
²¹&sup8;Po progeny
Soil / rock
Unseel.com · Radon Decay