What is the maximum dose rate allowed to the general public?

What is the maximum dose rate allowed to the general public?

• A. 0.5 mrem/hour
• B. 2 mrem/hour
• C. 5 mrem/hour
• D. 10 mrem/hour

Answer: (B)

The important idea here is protecting people who aren’t licensed to work with radioactive materials. For areas that the general public can access, the external dose rate is limited to a level that helps ensure the annual dose stays within regulatory limits. The standard maximum external dose rate in unrestricted areas is 2 mrem per hour. This keeps exposure from a single location low enough that, with typical time spent near the source, the yearly dose to a member of the public remains within the established public limit (about 100 mrem/year). Numbers like 0.5 mrem/hour are more restrictive, while 5 or 10 mrem/hour would allow higher exposure than allowed for the public. In practice, facilities use shielding and controls to enforce this limit so that public exposure stays safely below annual limits.

The important idea here is protecting people who aren’t licensed to work with radioactive materials. For areas that the general public can access, the external dose rate is limited to a level that helps ensure the annual dose stays within regulatory limits. The standard maximum external dose rate in unrestricted areas is 2 mrem per hour. This keeps exposure from a single location low enough that, with typical time spent near the source, the yearly dose to a member of the public remains within the established public limit (about 100 mrem/year).

Numbers like 0.5 mrem/hour are more restrictive, while 5 or 10 mrem/hour would allow higher exposure than allowed for the public. In practice, facilities use shielding and controls to enforce this limit so that public exposure stays safely below annual limits.