• decay
  • Some of radium-226's decay products received historical names including "radium", ranging from radium A to radium G, with the letter indicating approximately how far they were down the chain from their parent 226Ra. (wikipedia.org)
  • Its immediate decay product is the dense radioactive noble gas radon, which is responsible for much of the danger of environmental radium. (wikipedia.org)
  • The unusually low energy released in the tritium beta decay makes the decay (along with that of rhenium-187 ) appropriate for absolute neutrino mass measurements in the laboratory (the most recent experiment being KATRIN ). (wikipedia.org)
  • 1908
  • Beginning in 1908, luminous paint containing a mixture of radium and copper-doped zinc sulfide was used to paint watch faces and instrument dials, giving a greenish glow. (wikipedia.org)
  • known
  • Radium is the heaviest known alkaline earth metal and is the only radioactive member of its group. (wikipedia.org)
  • For applications in proposed fusion energy reactors, such as ITER , pebbles consisting of lithium bearing ceramics including Li 2 TiO 3 and Li 4 SiO 4 , are being developed for tritium breeding within a helium cooled pebble bed (HCPB), also known as a breeder blanket. (wikipedia.org)
  • amount
  • In January 2014 it was made public that a total of 875 TBq (2.45 g) of tritium are on the site of Fukushima Daiichi , and the amount of tritium contained in the contaminated water is increasing by approximately 230 TBq (0.64 g) per year. (wikipedia.org)
  • beta
  • The low-energy 5.7 keV beta particles emitted by tritium cannot pass through the enclosing glass tube. (wikipedia.org)
  • Promethium is a low-energy beta-emitter, which, unlike alpha emitters like radium does not degrade the phosphor lattice, so the luminosity of the material will not degrade so quickly. (wikipedia.org)
  • crystal
  • The activators can undergo change of valence (usually oxidation), the crystal lattice degrades, atoms - often the activators - diffuse through the material, the surface undergoes chemical reactions with the environment with consequent loss of efficiency or buildup of a layer absorbing either the exciting or the radiated energy, etc. (wikipedia.org)
  • the radium-barium density ratio is comparable to the radium-barium atomic mass ratio, due to the two elements' similar crystal structures. (wikipedia.org)
  • years
  • Radium paint was widely used for 40 years on the faces of watches, compasses, and aircraft instruments, so they could be read in the dark. (wikipedia.org)
  • Even so, cleaning tritium from the moderator may be desirable after several years to reduce the risk of its escaping to the environment. (wikipedia.org)
  • energy
  • High-energy neutrons can also produce tritium from lithium-7 in an endothermic (a net heat consuming reaction) reaction, consuming 2.466 MeV. (wikipedia.org)