What cumulative exposure limit would be calculated for a 40-year-old individual?

To determine the cumulative exposure limit for a 40-year-old individual, the standard guideline for occupational radiation exposure is to allow a cumulative dose of 1 rem for each year of age. Therefore, for a 40-year-old, the calculation is straightforward: 40 years multiplied by 1 rem per year results in a cumulative limit of 40 rem.

This system emphasizes personal accountability for radiation exposure based on age, allowing individuals to manage their exposure levels appropriately throughout their careers. The cumulative dose helps ensure that radiation protection strategies are in place to reduce health risks.

In considering the other options, they do not adhere to this standard calculation. For example, the limit calculated in millisieverts (mSv) can often cause confusion; however, the correct conversion from rem to mSv indicates that 1 rem is equivalent to approximately 10 mSv. Thus, while 400 mSv correlates with a person's age, it is not the direct measure of cumulative exposure calculated solely from age in rems. Options referencing lower limits like 4 rem and 100 mSv also do not represent the accurate cumulative limit based on the specified 1 rem per year formula.