What is the annual effective dose limit for the general public assuming frequent exposure?

What is the annual effective dose limit for the general public assuming frequent exposure?

• A. 1.0 mSv
• B. 5 mSv
• C. 0.05 mSv
• D. 0.5 mSv

Answer: (A)

The key idea here is protecting people who are not radiation workers by setting a strict yearly cap on how much effective dose they can receive from controllable sources. For frequent exposure to the general public, that cap is 1 mSv per year. This limit is chosen to keep the lifetime cancer risk from artificial sources at a very low level, while recognizing that people are also subjected to natural background radiation and, in some cases, unavoidable medical exposures. The concept of effective dose accounts for the different sensitivities of tissues, so the limit reflects overall risk rather than a single organ dose. Five millisieverts would exceed this public limit and could represent a higher risk than is deemed acceptable for the general population. Doses like 0.5 mSv or 0.05 mSv are below the standard limit, but they are not the established annual cap for the general public.

The key idea here is protecting people who are not radiation workers by setting a strict yearly cap on how much effective dose they can receive from controllable sources. For frequent exposure to the general public, that cap is 1 mSv per year. This limit is chosen to keep the lifetime cancer risk from artificial sources at a very low level, while recognizing that people are also subjected to natural background radiation and, in some cases, unavoidable medical exposures. The concept of effective dose accounts for the different sensitivities of tissues, so the limit reflects overall risk rather than a single organ dose.

Five millisieverts would exceed this public limit and could represent a higher risk than is deemed acceptable for the general population. Doses like 0.5 mSv or 0.05 mSv are below the standard limit, but they are not the established annual cap for the general public.