The devices used for radiotherapy are called "reference dosimeters", while those used for radiopharmaceuticals are called NPL in the UK, or will have a factor determined by comparison against a transfer standard chamber traceable to national standards at the user's site,.
The devices used for radiotherapy are called "reference dosimeters", while those used for radiopharmaceuticals are called radioisotope dose calibrators. A chamber will have a calibration factor established by a national standards laboratory such as ARPANSA in Australia or the NPL in the UK, or will have a factor determined by comparison against a transfer standard chamber traceable to national standards at the user's site,.