What would be the cumulative exposure limit for a 20-year-old individual?

The cumulative exposure limit for radiation is typically calculated based on the age of the individual, following a guideline that suggests an annual dose limit of 1 rem per year of age, or its equivalent in millisieverts (mSv). Therefore, for a 20-year-old individual, the cumulative exposure limit would be 20 rem, which is equivalent to 200 mSv when converted (1 rem = 10 mSv).

In this context, the option representing a cumulative exposure limit of 2 rem is significantly lower than what is established for a person who is 20 years old. For clarity, the correct calculation indicates that a 20-year-old should indeed have a cumulative limit of 20 rem or 200 mSv. As such, the understanding of cumulative exposure limits is essential for assessing radiation safety and ensuring that individuals are kept within safe exposure thresholds throughout their lifetime.