Encyclopedia of Geochemistry

2018 Edition
| Editors: William M. White

Chlorine Isotopes

  • Magali BonifacieEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-39312-4_90


Chlorine has 24 isotopes with mass numbers ranging from 28Cl to 51Cl. There are only two stable isotopes: 35Cl and 37Cl with respective proportions of 75.76% and 24.24% (Berglund and Wieser 2011). The longest-lived radioactive isotope is 36Cl (half-life of 301,000 years); all other isotopes having half-lives of less than 1 h. Variations of the chlorine isotope ratio (R = 37Cl/35Cl) are expressed in the δ-notation with \( {\updelta}^{37}\mathrm{Cl}={\left({\mathrm{R}}_{\mathrm{sample}}/{\mathrm{R}}_{\mathrm{standard}}\hbox{--} 1\right)}^{\ast }1000 \)

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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institut de Physique du Globe de ParisSorbonne Paris Cité, Université Paris DiderotParisFrance