In contrast to natural radioactivity, artificial radioactivity is created by human activity. Only one third of exposure to radioactivity is from artificial sources.
The two main sources of artificial exposure are:
- cosmic radiation a;
- radiation from the earth and buildings (construction materials) b;
- radiation from the human body c;
- soil gas radon d;
- medical applications e: some radionuclides can be used for examinations (for example X-rays) and medical treatment (for example radiotherapy);
- industrial products f : radionuclides produced in nuclear installations and mining.