The standard defines terms being relevant for using radioactive material. It applies to medical application of radioactive material in diagnostic and therapy as well as in radiation protection.
DIN 6814-4:2006 Referenced Document
DIN 6814-2:2000 Terms in the field of radiological technique - Part 2: Radiation physics
DIN 6814-4:2006 history
2006DIN 6814-4:2006-10 Terms in the field of radiological technique - Part 4: Radioactivity
2006DIN 6814-4:2006 Terms in the field of radiological technique - Part 4: Radioactivity
1970DIN 6814-4:1990 Terms in the field of radiological technique - Part 4: Radioactivity