- Half-life: 12.3 years
- Emissions: Beta particles with a maximum energy of 18.6 keV and an average energy of 5.7 keV.
- Maximum Range: 4.7 mm in air; 0.006 mm in tissue
- Fraction transmitted through the dead layer of the skin: none
Dose Rate and Shielding
- Dose rate to the skin at 10 cm: None
- Dose rate to epidermal basal cells from skin contamination of 1 mCi/cm2: None
- Shielding: None needed.
- Annual Limit on Intake (ALI): 80 millicuries via ingestion, assuming intake as tritiated water. The ingestion of one ALI will produce a dose of 5 rem.
Liquid scintillation counting is the preferred method for detecting H-3. Most G-M detectors will not detect the presence of H-3.
H-3 contamination cannot be detected with a G-M meter, and special precautions are needed to keep the work environment clean. The regular use of wipe testing, using a liquid scintillation counter, is the only way to insure that your work space does not contain contamination.
- Solid Wastes/Liquid Scintillation Wastes: through the Off-Site Radioactive Waste Disposal Program
- Liquid Wastes: through the Sewer Disposal Program. The laboratory disposal limit for H-3 is 3 mCi per month.