Which unit is used for the maximum dosage in the RVNS limit?

• A. mSv
• B. Sv
• C. rem
• D. Gy

Answer: (A)

When setting regulatory exposure limits, the key idea is dose equivalent—the biologically relevant measure—rather than raw energy deposited. For practical limits on how much radiation someone can receive, these values are small, so they’re expressed in milliSieverts. That keeps numbers convenient (for example, limits around a few tens of mSv per year) without resorting to larger or more abstract units.

Gray measures absorbed energy per mass and doesn’t account for the varying biological impact of different radiation types, so it isn’t used for regulatory dose limits. Rem is an older unit for dose equivalent, but modern practice uses the SI units, with milliSieverts preferred for ease of reporting and understanding. Using the milliSievert aligns with the typical presentation of maximum permissible doses in RVNS contexts.