Counts per minute dose reading. This modifies the tube characteristic so each count resulting from a particular radiation type is equivalent to a specific quantity of deposited dose. More can be found on radiation dose and dose rate at absorbed dose and equivalent dose. Disintegrations per minute (dpm) and disintegrations per second (dps) are measures of the activity of the source of radioactivity. The SI unit of radioactivity, the becquerel (Bq), is equivalent to one disintegration per second. This unit should not be confused with cps, which is the number of counts received by an instrument from the source. One dps (one dpm)
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