REM stands for which term in radiation dose terminology?

REM stands for which term in radiation dose terminology?

• A. Roentgen Equivalent Man
• B. Radiation Exposure Measure
• C. Roentgen Energy Metric
• D. Radiation Measure of Rem

Answer: (A)

The concept tested is how a radiation dose quantity translates to human risk. REM is the dose-equivalent unit used in radiation protection, standing for Roentgen Equivalent Man. It merges the amount of energy deposited in tissue with the type of radiation to reflect potential biological damage. The dose equivalent H equals the absorbed dose D times a quality factor Q that accounts for radiation type; for X-rays and gamma rays, Q is about 1, so the rem closely tracks absorbed dose in these cases. Historically, rem was used to express risk to humans, but the modern SI unit is the sievert, with 1 sievert equal to 100 rem (so 1 rem = 0.01 sievert). The other options do not represent the established term.

The concept tested is how a radiation dose quantity translates to human risk. REM is the dose-equivalent unit used in radiation protection, standing for Roentgen Equivalent Man. It merges the amount of energy deposited in tissue with the type of radiation to reflect potential biological damage. The dose equivalent H equals the absorbed dose D times a quality factor Q that accounts for radiation type; for X-rays and gamma rays, Q is about 1, so the rem closely tracks absorbed dose in these cases. Historically, rem was used to express risk to humans, but the modern SI unit is the sievert, with 1 sievert equal to 100 rem (so 1 rem = 0.01 sievert). The other options do not represent the established term.