Isotopes of radon


Isotopes of radon

There are thirty four known isotopes of radon (Rn). The most stable isotope is 222Rn, which is a decay product (daughter product) of 226Ra, has a half-life of 3.823 days and emits alpha particles. 220Rn is a natural decay product of thorium and is called “thoron.” It has a half-life of 55.6 seconds and also emits alpha radiation. 219Rn is derived from actinium, is called “actinon,” is an alpha emitter and has a half-life of 3.96 seconds.

Decay chain

The full decay series of 238U which produces natural radon is as follows (with half-lives):
238U (4.5 x 109 yr), 234Th (24.1 days), 234Pa (1.18 min), 234U (2.457 x 105 yr), 230Th (75,000 yr), 226Ra (1,600 yr), 222Rn (3.82 days), 218Po (3.1 min), 214Pb (26.8 min), 214Bi (19.7 min), 214Po (164 µs), 210Pb (22.3 yr), 210Bi (5.01 days), 210Po (138 days), 206Pb (stable).

Older nomenclature

Isotopes of radon occurring within the radioactive disintegration chains of actinium, radium and thorium were known as:
* "actinon" or "actinium emanation" : 219Rn
* "rooting" or "thorium emanation" : 220Rn
* "radon" or "radium emanation, emanation, emanon," or "niton" : 222Rn

Table

Notes

* Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
* Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

* Isotope masses from [http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in "Nuclear Physics" A729 (2003).
* Isotopic compositions and standard atomic masses from [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)] . "Pure Appl. Chem." Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html Atomic Weights Revised (2005)] .
* Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties] , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005).
** David R. Lide (ed.), Norman E. Holden in "CRC Handbook of Chemistry and Physics, 85th Edition", online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Isotopes du radon — Le radon (Rn) possède 35 isotopes connus, tous radioactifs. Le plus stable d entre eux est le radon 222 (222Rn) avec une demi vie de 3,823 jours. Quatre isotopes, 218Rn, 219Rn, 220Rn et 222Rn, sont présents dans la nature à l état de trace; ils… …   Wikipédia en Français

  • Radon — This article is about the chemical element. For other uses, see Radon (disambiguation). astatine ← radon → francium Xe ↑ Rn ↓ Uuo …   Wikipedia

  • Radon — Pour les articles homonymes, voir Radon (homonymie) et Rn. Radon Asta …   Wikipédia en Français

  • Radon 222 — Le radon 222, noté 222Rn, est l isotope du radon dont le nombre de masse est égal à 222 : son noyau atomique compte 86 protons et 136 neutrons avec un spin 0+ pour une masse atomique de 222,0175705 g/mol. Il est caractérisé par un excès …   Wikipédia en Français

  • radon — [ radɔ̃ ] n. m. • 1923; de radium ♦ Phys. Élément radioactif naturel (Rn; no at. 86), gaz rare produit par la désagrégation des isotopes du radium. ● radon nom masculin Élément radioactif de masse atomique 222, de numéro atomique 86. (C est le… …   Encyclopédie Universelle

  • Radon — Ra don (r[=a] d[o^]n), n. (Chem.) An intensely radioactive gaseous element produced by the radioactive decay of radium 226, which is the main isotope of radium found in pitchblende. Chemically it is an inert noble gas. Its atomic symbol is Rn. It …   The Collaborative International Dictionary of English

  • radon — Symbol: Rn Atomic number: 86 Atomic weight: (222) Colorless radioactive gaseous element, belongs to the noble gases. Of the twenty known isotopes, the most stable is Rn 222 with a half life of 3.8 days. Formed by the radioactive decay of Radium… …   Elements of periodic system

  • radon — /ray don/, n. Chem. a chemically inert, radioactive gaseous element produced by the decay of radium: emissions produced by outgassing of rock, brick, etc. are a health hazard. Symbol: Rn; at. no.: 86; at. wt.: 222. [1915 20; RAD(IUM) + ON2] * * * …   Universalium

  • Radon — Eigenschaften …   Deutsch Wikipedia

  • Isotopes du thorium — Le thorium (Th) comme tous les éléments de numéro atomique supérieur à celui du plomb, ne possède aucun isotope stable. Cependant, il possède six isotopes présent dans la nature et l un d eux, le thorium 232 (232Th), est relativement stable, avec …   Wikipédia en Français


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.