<prompt> The SI unit of a dose equivalent of radiation is:RemRadSieveGray  <response>: Radiation absorbed dose, Dose equivalent, and exposure are often measured and stated in the older units called rad, rem, or roentgen respectively. International System of Units SI for radiation measurement is now the official system of measurement and uses the gray Gy, sieve Sv, CoulombKg for absorbed dose, equivalent dose and exposure respectively. Conversions are as follows: 1 Gy 100 rad 1 Sv 100 rem 1 coulomb Kg 3876 Roentgen Ref: Parks textbook of Preventive and Social Medicine, 21st edition, page-687 