Realization of the unit of absorbed dose to water
The absorbed dose is the quotient of the mean energy imparted by ionizing radiation to a material and the mass of the material. In case the material is water, the term is “absorbed dose to water”. The unit of measurement of absorbed dose is the Gray (Gy). (1 Gy = 1 J/kg)
The realization of the unit of the absorbed dose to water DW is carried out by BEV in two steps: The unit of the absorbed dose to graphite is realized by a graphite calorimeter as primary standard. The conversion of the absorbed dose to graphite to the absorbed dose to water is carried out by two different methods (a theoretical and an experimental one).
The absorbed dose to water is the measurand for therapy dosimeters