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.
There is a caveat to this calculation, however. The half-life of a free neutron is 15.4 minutes, but when the same neutron is bound in a compound nucleus such as oxygen-16, it is apparently as stable as the proton.he ultimate form of this temporal decay of matter is proton decay, whose extremely long half-life (unknown, but at least 35 powers of ten (10(35) years), is related to the extreme weakness of the gravitational force.