Rutherford (unit) unit for activity, the rutherford became obsolete, and it is no longer commonly used. The following table shows radiation quantities in SI and non-SI units: Rutherford (unit) The rutherford (symbol Rd) is a non-SI unit of radioactive decay. It is defined as the activity of a quantity of radioactive material in which one million nuclei decay per second. It is therefore equivalent to one megabecquerel, and one becquerel equals one microrutherford. One rutherford is equivalent to 2.703 × 10 curie. The unit was introduced in 1946. It was named after British/New Zealand physicist and Nobel laureate Lord Ernest Rutherford (Nobel
2019 redefinition of SI base units values associated with the following constants of nature: The seven definitions above are rewritten below with the derived units (joule, coulomb, hertz, lumen and watt) expressed in terms of the seven base units (second, metre, kilogram, ampere, kelvin, mole and candela), according to the updated 9th edition of the SI Brochure (2018). In the list that follows, the symbol sr stands for the dimensionless unit steradian. As part of the redefinition, the international prototype kilogram was retired and definitions of the kilogram, the ampere, and the kelvin were replaced. The definition of the mole was revised. These changes have the