SI, while recognizing that the CIPM did not. NIST recommends defining the rad in relation to SI units in every document where this unit is used. Nevertheless, use of the rad remains widespread in the US, where it is still an industry standard. Although the United States Nuclear Regulatory Commission still permits the use of the units curie, rad, and rem alongside SI units, the European Union required that its use for "public health ... purposes" be phased out by 31 December 1985. Radiation-related quantities The following table shows radiation quantities in SI and non-SI units: See also Becquerel Curie (unit) Radiation Gray (unit) Roentgen (unit) Roentgen equivalent man (rem) Sievert Order of magnitude (unit) References Units of radiation dose Non-SI metric units es:Dosis absorbida#Unidades antiguas