Rem (millirem) is used to measure what?

• A. Rem (millirem)
• B. TEDE
• C. Somatic effects
• D. Genetic radiation

Answer: (A)

Rem, or millirem, is the unit used to express dose equivalent—the amount of radiation energy deposited in tissue adjusted for the biological impact of different types of radiation. By applying a radiation quality factor to the absorbed dose, this unit lets us compare the potential harm from alpha, beta, gamma, and other radiations on a common scale. That makes it the practical measure used to set exposure limits and track protection. In many protection contexts, this same concept underlies the Total Effective Dose Equivalent, which sums the dose to the whole body and is expressed in rem or sievert. The phrases somatic effects and genetic radiation describe the outcomes of exposure rather than a unit of measurement.