Radioactivity is something we live with constantly – it’s always there in relatively small amounts. Around the world, naturally occurring, higher-than-average levels of radioactivity are found in various types of beaches and soils, among other places. Meanwhile, most concrete is radioactive, though levels obviously vary. In the US, it is possible to get your home tested for radon gas – which is produced slowly over time by radioactive construction materials. Even the human body is slightly radioactive because we contain elements like potassium-40, which decay.
Available at: http://www.bbc.com/future/story/20180405-why-people-collect-radioactive-objects. Accessed on April, 13th 2018. Adapted.
Based on the text, there are the following statements:
I. Radioactivity is found in human body.
II. We do not frequently live with radioactivity.
III. Levels of radioactivity is found in construction materials.
It’s correct only what’s affirmed in:
