Measurements by the relative method using the germanium detector for radionuclides

The National Laboratory for Ionizing Radiation Metrology (LNMRI/IRD/CNEN) of Rio de Janeiro performed standardization of different radionuclides. Such standards are applied in nuclear industries, nuclear research, radiation protection and nuclear medicine. The comparative method using a Ge detector was applied for obtaining results of some radioactive point and ampoule sources. The activities of 22Na, 60Co, 133Ba and 137Cs radionuclides were determined. The total uncertainties reached values below 1.0 % to liquid samples and below 1.4% to solid samples, in a confidence level of 68 %.