helium age

См. также в других словарях:

• Helium — Hélium Traduction à relire Helium → …   Wikipédia en Français

• Hélium 4 — Hélium Traduction à relire Helium → …   Wikipédia en Français

• HÉLIUM (DATATION PAR L’) — HÉLIUM DATATION PAR L’ Des atomes d’hélium naissent lors de la désintégration de 238U, de 235U et de 232Th; ainsi:238U face=F0019轢 206Pb + 8 4He 238U face=F0019轢 207Pb + 7 4He, 232Th face=F0019轢 208Pb + 6 4He, L’isotope 235U est très peu abondant …   Encyclopédie Universelle

• Helium (disambiguation) — Helium, in science and astronomy, may refer to:*Helium, chemical element **Helium 3, an isotope of helium **Helium 4, an isotope of helium *Helium dating, a method of determining the age of rocks *Helium fusion, a type of nuclear fusion in stars… …   Wikipedia

• Helium dating — is a method of determining the age of a substance using the decay of radioactive isotopes …   Wikipedia

• Age of the Earth — This article is about scientific estimates of the age of the Earth. For religious and other non scientific estimates, see Dating Creation. Earth as seen from Apollo 17 The age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%) …   Wikipedia

• helium dating — Method of dating that depends on the production of helium during the decay of radioactive isotopes of uranium and thorium. Because of this decay, the helium content of any mineral or rock capable of retaining helium will increase during the… …   Universalium

• Helium — otherusesHelium (He) is a colorless, odorless, tasteless, non toxic, inert monatomic chemical element that heads the noble gas group in the periodic table and whose atomic number is 2. Its boiling and melting points are the lowest among the… …   Wikipedia

• Hélium — Pour les articles homonymes, voir Helium (homonymie). Hélium Hydrogène ← Hélium → …   Wikipédia en Français

• helium dating — noun a method of determining the age of rock that depends on the production of helium during the decay of various radioactive isotopes of uranium and thorium. Syn: He dating …   Wiktionary

• Obtention de l'helium — Hélium Traduction à relire Helium → …   Wikipédia en Français