Background Radiation 0.0 / 5 ? PhysicsRadioactivityGCSEEdexcel Created by: errolshineCreated on: 07-12-14 21:12 Background radiation comes from, 1.. Unstable isotopes 1 of 6 2... Cosmic rays from space but most are deflected. 2 of 6 3... Human activity 3 of 6 What can cause higher levels of background radiation in certain areas? Certain underground rocks release radon gas 4 of 6 What is radon gas? It makes up 50 percent of our BR 5 of 6 Radon gas gets trapped in people's houses 6 of 6
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