Let’s Begin
Radiation specialists use the unit “rem” (or sievert) to describe the amount of radiation dose someone received. We are going to use that unit throughout the sections. Without getting into technical specifics about that unit, it is enough to know that it indicates a measure of how much radiation energy is absorbed in our body. And, as we will see in other sections, the total energy that is absorbed and its effectiveness in causing change is the basis for determining whether health effects may result.