How much background radiation does an individual typically receive in a year?

An individual typically receives between 1500 to 3500 microsieverts (uSv) of background radiation in a year. This measurement encompasses various sources of natural radiation, which include cosmic radiation from the atmosphere, terrestrial radiation from the ground, and internal radiation from radioactive isotopes present in the body.

The variability in individual exposure levels is influenced by several factors including geographic location (for example, living at higher altitudes where cosmic radiation is more intense), lifestyle choices (like frequent air travel), and building materials in homes (as some materials can emit radon). The figure for background radiation illustrates the average exposure, suggesting that most individuals will find themselves within this range annually.

The other options represent estimates that are considerably higher than what is typically observed. While there may be instances of individuals receiving greater doses due to specific circumstances (such as occupational exposure), the average person is unlikely to experience levels that reach the higher extremes mentioned in those choices. Hence, the selected range provides a more accurate account of annual exposure from background radiation for the general population.