Radioactive surface reference sources are represented. The radionuclides in these sources are embeded into epoxy resins. Two new types of sources were developed for the calibration and standardization ofautoradiograms: The Tc-99 step wedge references source and the beta calibration set. Further on radioactive labelled surface sources for different nuclear measuring methods using as reference sources are described. These sources are labelled with Co-57, Co-60, Ni-63, Sr-90/Y-90, Tc-99, Ba-133, Cs-137, Pm-147, Eu-152, Tl-204, Am-241. The lowest density per unit area is 5 mg · cm−2, the maximum area of a source is 300 cm2. Commonly the radioactivity concentration amounts from 5 Bq · cm−2to 50 kBq · cm−2, higher concentration is possible.