Radiation emitted by tritium is extremely weak and can only travel 5mm through air. It is also unable to penetrate the skin, meaning there is no risk to the human body of external exposure. When it does enter the body (through ingestion, absorption, or inhalation), it is eventually excreted with water from the body. It does not accumulate or become concentrated within the body.
Studies conducted on animals and epidemiological studies carried out to date do not indicate that tritium has a more pronounced effect on living things than other radioactive materials.