Abstract
Several intercomparisons with up to 82 participants have been organized in order to obtain information on the quality of activity measurements of radiopharmaceuticals with radionuclide calibrators (“activimeters”) in nuclear medicine. The following radionuclides were chosen: 99mTc, 99mTc(99.9%) + 99Mo(0.1%), 123I, 131I and 201Tl. The error limits given in the European Pharmacopoeia were exceeded in about one third of the reported activity values.
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