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.
The most stable known darmstadtium isotope, 281 Ds, is also the heaviest known darmstadtium isotope; it has a half-life of 11 seconds, although a metastable state, 281m Ds, has been reported to have a longer half-life of about 3.7 minutes. The isotope 279 Ds has a half-life of 0.18 seconds respectively.