When natural sources of ionizing radiation become increased because of accidental or deliberate human actions such as mining,they are referred to as:

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When natural sources of ionizing radiation become increased because of accidental or deliberate human actions such as mining, they are referred to as enhanced natural sources. They are not considered artificial or manmade sources, as they are still originating from natural sources. Extraterrestrial sources refer to radiation coming from outer space.

When Natural Sources of Ionizing Radiation Become Increased Because of Accidental