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

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

• A. 0.1 mSv
• B. 5 mSv
• C. 0.05 mSv
• D. 10 mSv

Answer: (B)

Think of how protection standards set a limit on how much radiation a person can receive in a year. For the general public in ordinary, non-occupational situations, the usual annual limit is kept fairly low. When exposure is infrequent—meaning it’s not a regular, ongoing situation—the guidelines allow a higher yearly total to accommodate those rare events, up to 5 mSv. This upper bound balances keeping risk low with not unduly restricting occasional exposures. The other numbers aren’t the standard allowance for infrequent exposures: 0.1 mSv or 0.05 mSv are far below what’s typically needed for any annual public exposure, and 10 mSv would exceed the infrequent-exposure limit. So 5 mSv is the correct upper limit for infrequent public exposure.

Think of how protection standards set a limit on how much radiation a person can receive in a year. For the general public in ordinary, non-occupational situations, the usual annual limit is kept fairly low. When exposure is infrequent—meaning it’s not a regular, ongoing situation—the guidelines allow a higher yearly total to accommodate those rare events, up to 5 mSv. This upper bound balances keeping risk low with not unduly restricting occasional exposures. The other numbers aren’t the standard allowance for infrequent exposures: 0.1 mSv or 0.05 mSv are far below what’s typically needed for any annual public exposure, and 10 mSv would exceed the infrequent-exposure limit. So 5 mSv is the correct upper limit for infrequent public exposure.