Nuklida · radioaktif
Hidrogen-3 (³H)
Hidrogen-3 (³H) adalah isotop radioaktif hidrogen dengan 1 proton dan 2 neutron (nomor massa 3). Waktu paruhnya 12,32 tahun (± 0,02 tahun), meluruh terutama lewat peluruhan beta minus (β⁻).
Data nuklida
- Unsur
- Hidrogen (H, Z = 1)
- Nomor massa (A)
- 3
- Proton (Z)
- 1
- Neutron (N)
- 2
- Massa atom
- 3.01604928132 ± 0.00000000008 u
- Waktu paruh
- 12,32 tahun (± 0,02 tahun)
- Mode peluruhan
- Peluruhan beta minus (β⁻) ( 100 %)
- Inti anak
- Helium-3 (³He)
- Tahun penemuan
- 1934
- Sumber data
- IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem
Kegunaan isotop hidrogen
- 3H (tritium), with a half-life of 12.31 years, decays to 3He. The relative variations in n(3He)/n(3H) ratios can be interpreted in terms of elapsed time for dating purposes. The dates of groundwater recharge (water moving downward from the surface), where large amounts of 3H were received from precipitation following thermonuclear bomb test periods, come from the elapsed time since a water mass became isolated from the atmosphere in the time range from the mid-1950s to the present.
- 3H is used for self-luminous exit signs in aircraft and commercial buildings. It is found in luminous dials, gauges, wristwatches, and luminous paints. 2H, in the form of heavy water, is used in CANDU (CANada Deuterium Uranium) nuclear reactors as a moderator and coolant.