How do you calculate equivalent dose rate?

To determine the equivalent dose rate, the correct approach involves calculating how much equivalent dose is received per unit of time. The equivalent dose is a measure of the biological effect of radiation, while the dose rate quantifies this effect over time. By dividing the equivalent dose by the time taken, you effectively find out how quickly an individual is being exposed to the biological effects of radiation, thus giving you the dose rate.

This calculation is valuable in understanding risks associated with radiation exposure, helping to assess safety standards in various environments where radiation is present, such as medical settings or nuclear facilities. The other choices do not appropriately reflect the relationship between dose and time required to find a rate; either they involve incorrect operations such as addition or inappropriate multiplication of the doses. Therefore, the method of taking the equivalent dose and dividing it by the time is both logical and essential in the context of calculating dose rates.