ASNT Industrial Radiography Radiation Safety Practice Test

What would be considered excessive radiation exposure for a monitored person receiving a maximum of 5000 mR per year?

1. Any exposure above 5000 mR

2. Any unnecessary exposure to radiation

3. Exposure from occupational hazards only

4. Exposures from medical procedures

The correct answer is: Any unnecessary exposure to radiation

The correct choice is identifying any unnecessary exposure to radiation as excessive for a monitored individual receiving a maximum of 5000 mR per year. This highlights the importance of not only adhering to the annual dose limits established for radiation workers but also ensuring that all exposures are justified and necessary. In radiation safety practices, unnecessary exposure refers to any radiation exposure that does not contribute to the individual's occupational duties or is not medically warranted. For instance, if an individual exceeds the prescribed dose limit, even if the exposure was intentional and justified, it could still be considered excessive if it goes beyond the regulatory threshold. While maximum allowable doses are set to protect individuals from harmful effects of radiation, it is also crucial to minimize exposure whenever possible. This principle is encapsulated in the ALARA (As Low As Reasonably Achievable) concept, which aims to keep radiation exposure well below the maximum allowable levels unless required for legitimate occupational or medical purposes. In this context, simply counting any exposure above 5000 mR, exposure limited strictly to occupational hazards, or considering medical procedures without context would not address the broader scope of what constitutes excessive exposure. Unnecessary exposure directly aligns with the goal of maintaining safety and minimizing risk for individuals working in environments where radiation is present.