title: [Radioactive and radiation standards (VI), 5. Sealed radioactivity standards for general use (author's transl)].
mesh_terms: D000512:Alpha Particles; D004583:Electrons; D005720:Gamma Rays; D007457:Iodine Radioisotopes; D008722:Methods; D011827:Radiation; D011839:Radiation, Ionizing; D011851:Radioactivity; D012542:Scattering, Radiation
chemical_list: D007457:Iodine Radioisotopes