The maximum dimensions for your carry-on bag are: Length - 24 (61cm) including wheels and handles ; Width - 17 (43cm) Height - 10 (25cm) For additional carry-on items beyond the one-bag limit, each piece will incur a fee. Refer to the checked baggage page for more information.
Tritium (3H) is the most stable radioisotope of hydrogen. That is, of all radioactive isotopes of hydrogen, tritium is the least radioactive. It has a proton and 2 neutrons in its nucleus. Tritium decays through beta minus decay and changes to helium-3. It has a half-life of 12.32 years.
Other forms of Radiometric Dating. Carbon 14's half-life is not nearly long enough to measure dates in the geological past. For that elements with a half life of many millions of years are required. Here are the half-lives of some other radioactive elements: 1  Uranium-238 ~half life=4.5 billion years. 2  Uranium-235 ~half life=704 million years.