The average annual radiation dose for Grand Central Station worker?

The average annual radiation dose for Grand Central Station worker?

• A. 70 (MREM/YR)
• B. 10 (MREM/YR)
• C. 120 (MREM/YR)
• D. 20 (MREM/YR)

Answer: (C)

The idea being tested is how much radiation a typical non-radiation-worker might receive in a real-world setting and how that compares to safety limits. For someone working in an ordinary indoor environment like Grand Central Station, the annual dose comes from natural background radiation plus small, incidental workplace exposures. 120 mrem per year falls in the common range used to illustrate a moderate, everyday occupational exposure that is still far below the legal limit for workers (which is several thousand mrem per year). It represents a plausible average when you combine natural background with minor workplace factors. Other options would imply exposures that are unusually low for a typical indoor environment or reflect amounts more associated with higher-exposure settings, so they don’t fit the everyday station-worker scenario as well.

The idea being tested is how much radiation a typical non-radiation-worker might receive in a real-world setting and how that compares to safety limits. For someone working in an ordinary indoor environment like Grand Central Station, the annual dose comes from natural background radiation plus small, incidental workplace exposures. 120 mrem per year falls in the common range used to illustrate a moderate, everyday occupational exposure that is still far below the legal limit for workers (which is several thousand mrem per year). It represents a plausible average when you combine natural background with minor workplace factors.

Other options would imply exposures that are unusually low for a typical indoor environment or reflect amounts more associated with higher-exposure settings, so they don’t fit the everyday station-worker scenario as well.