Ionizing radiation affects the living cells at nanoscale; therefore, modern radiation therapy needs dose detection in nanovolumes . It would be possible to apply the nanodosimeters in radiobiology in order to obtain measurements that could enhance the knowledge of how ionizing radiation affects the DNA and other cell structures. This knowledge could improve effectiveness of radiation therapy. Currently nanoscaled dosimeters do not exist. In order to measure the dose of ionizing radiation absorbed by nanovolumes, at least the thickness of the dosimeter should be nanosized . Solid material that can be used for the nanodosimeter should have properties of either semiconductor or dielectric to store the electric charge induced by radiation for a long time. Diamond-like carbon (DLC) belongs to such material and could be fabricated as the nanofilm. The DLC nanofilms were fabricated by ion deposition technology. The specimens were synthesized using HMDSO+H2 and C2H2 gases and had thickness of 200 nm. Some specimens were doped with Cu and Ag and had thickness of 100 nm. The readout of the absorbed dose was provided by the photoelectron emission measured from the specimens. The specimens were radiated with ultraviolet (Xe+Hg tube) at 5, 10, 15 and 20 minutes of exposures. The ultraviolet radiation (UV) was selected as a model for testing the potential ability of the photoelectron emission to provide the dose readout. The increment of photoelectrons released charge (relative to non-radiated specimens) correlated to the UV exposure.