Generic Radiation Worker Training 2025 – 400 Free Practice Questions to Pass the Exam

Natural sources of radiation generally account for a higher percentage of total radiation exposure for individuals. This is primarily due to the omnipresence of natural background radiation, which includes cosmic rays, terrestrial radiation from elements such as uranium and radon, and internal exposure from radioactive isotopes present in the body.

On average, it is estimated that natural sources contribute about 80% of the total radiation exposure a person receives annually. This high percentage is influenced by factors such as geographic location, altitude, and local geological features that may enhance natural radiation levels.

In contrast, man-made sources of radiation—such as medical procedures (like X-rays), industrial applications, and nuclear power generation—while impactful, typically contribute a relatively smaller proportion to overall exposure. Though the doses from man-made sources can be significant in certain contexts (e.g., during medical imaging), the cumulative exposure from these sources remains lower compared to that from the natural background.

The concept of consistency mentioned in one of the incorrect options can vary widely depending on individual circumstances, such as the frequency of medical procedures or the presence of industrial sources nearby. Overall, the dominance of natural radiation exposure illustrates the importance of understanding both natural and man-made radiation in the broader context of occupational and public safety in