International Committee for Weights and Measures
The International Committee for Weights and Measures (CIPM) adopted the sievert in 1980 but never accepted the use of the rem. The NIST recognizes that this unit is outside the SI but temporarily accepts its use in the U.S. with the SI. The rem remains in widespread use as an industry standard in the U.S. The United States Nuclear Regulatory Commission still permits the use of the units curie, rad, and rem alongside SI units.