From memory Tritium or H-3 is relatively safe unless ingested and is not classed as a radiation risk. [0] [0] "Nuclide Safety Data Sheet Hydrogen-3" Beta radia

From memory Tritium or H-3 is relatively safe unless ingested and is not classed as a radiation risk. [0] [0] "Nuclide Safety Data Sheet Hydrogen-3" Beta radiation won't penetrate dead skin and has approximately 6mm penetration capacity. http://hpschapters.org/northcarolina/NSDS/3HPDF.pdf http://hpschapters.org/northcarolina/NSDS/3HPDF.pdf