Which statement correctly relates to the equivalence of 0.5 mSv in mrem?

Which statement correctly relates to the equivalence of 0.5 mSv in mrem?

• A. 0.5 mSv equals 50 mrem
• B. 0.5 mSv equals 5 mrem
• C. 0.05 mSv equals 50 mrem
• D. 50 mSv equals 50 mrem

Answer: (A)

To relate millisieverts to millirem, use the fact that 1 mSv equals 100 mrem. This comes from 1 Sv = 100 rem and 1 mSv = 0.001 Sv, so 0.001 Sv × 100 rem/Sv = 0.1 rem, which is 100 mrem. Therefore, convert by multiplying by 100. So, 0.5 mSv × 100 = 50 mrem. Thus 0.5 mSv is equivalent to 50 mrem. The other statements misapply the conversion factors: for example, 0.5 mSv would be 5 mrem only if 1 mSv were 10 mrem; 0.05 mSv would be 50 mrem only if 1 mSv were 1000 mrem; and 50 mSv would equal 5000 mrem, not 50.

To relate millisieverts to millirem, use the fact that 1 mSv equals 100 mrem. This comes from 1 Sv = 100 rem and 1 mSv = 0.001 Sv, so 0.001 Sv × 100 rem/Sv = 0.1 rem, which is 100 mrem. Therefore, convert by multiplying by 100.

So, 0.5 mSv × 100 = 50 mrem. Thus 0.5 mSv is equivalent to 50 mrem.

The other statements misapply the conversion factors: for example, 0.5 mSv would be 5 mrem only if 1 mSv were 10 mrem; 0.05 mSv would be 50 mrem only if 1 mSv were 1000 mrem; and 50 mSv would equal 5000 mrem, not 50.