Autodosimeters and personal dosimeters are means of measuring individual doses generated during external (with external gamma irradiation) and internal irradiation. Both types of measuring instruments in circulation at the same time are called multi-purpose (one-, two- or multi-channel). Individual doses are formed both during external irradiation as a result of exposure of the human body to technogenic and natural sources of radiation (anthropogenic and natural sources), and during internal irradiation associated with the natural content of nuclei.