Question:easy
Which of the following statements best describes 'background radiation'?
Which of the following statements best describes 'background radiation'?
Show Hint
Always present, comes from cosmic rays, soil, radon, and the body itself.
Updated On: Jun 24, 2026
- Radiation in the background of nuclear reactors
- Radiation in the background during radiological investigations
- Radiation present constantly from natural sources
- Radiation from nuclear fall out
Show Solution
The Correct Option is C
Solution and Explanation
The word to anchor on is 'background', meaning the radiation that is always there regardless of what humans do. By definition it is the natural baseline dose we all receive every single day.
Where does it come from? From space as cosmic rays, from the ground as gamma emission by uranium, thorium, and potassium-40, from radon seeping out of soil and building materials, and from radionuclides naturally present in our own tissues. All of these are natural and continuous.
Now test the options. Reactor radiation and nuclear fallout are artificial and tied to specific facilities or events, so they are extra exposures, not the baseline. Radiation during a radiological test is a deliberate medical dose layered above background. Only the choice describing constant radiation from natural sources fits the definition.
Therefore background radiation is the steady natural-source radiation surrounding us at all times.
\[\boxed{\text{Radiation present constantly from natural sources}}\]
Where does it come from? From space as cosmic rays, from the ground as gamma emission by uranium, thorium, and potassium-40, from radon seeping out of soil and building materials, and from radionuclides naturally present in our own tissues. All of these are natural and continuous.
Now test the options. Reactor radiation and nuclear fallout are artificial and tied to specific facilities or events, so they are extra exposures, not the baseline. Radiation during a radiological test is a deliberate medical dose layered above background. Only the choice describing constant radiation from natural sources fits the definition.
Therefore background radiation is the steady natural-source radiation surrounding us at all times.
\[\boxed{\text{Radiation present constantly from natural sources}}\]
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