Radiation Safety Practice Exam

Which radiation source is often overlooked when considering background radiation?

1. X-rays from medical procedures

2. Cosmic radiation from outer space

3. Radon gas from the ground

4. Natural radiation from rocks

The correct answer is: Radon gas from the ground

Radon gas is a significant source of background radiation that is often overlooked in discussions about radiation exposure. It is a naturally occurring radioactive gas that results from the decay of uranium found in soil, rock, and water. As radon gas is released from the ground, it can accumulate in enclosed spaces like homes and buildings, especially in basements and lower levels. Because it is colorless, tasteless, and odorless, many individuals may not be aware of its presence or the potential health risks it poses. Long-term exposure to high levels of radon is a known health risk, as it has been linked to an increased risk of lung cancer. In contrast, while X-rays from medical procedures and cosmic radiation are important sources of radiation exposure, they are typically more recognized and monitored in public discussions about radiation safety. Likewise, natural radiation from rocks is also acknowledged, but radon gas can significantly impact individual exposure levels and is less frequently considered in personal risk assessments. This makes awareness of radon crucial for maintaining overall radiation safety.