Is radioactive decay really exponential?

Radioactive decay of an unstable isotope is widely believed to be exponential. This view is supported by experiments on rapidly decaying isotopes but is more difficult to verify for slowly decaying isotopes. The decay of ...C can be calibrated over a period of 12550 years by comparing radiocarbon da...

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Bibliographic Details
Published in:Europhysics letters 2012-03, Vol.97 (5), p.P1-P1
Main Author: Aston, P J
Format: Article
Language:English
Subjects:
Atmospherics
Dating
Dating techniques
Decay
Decay rate
Isotopes
Mathematical models
Radioactive decay
Online Access:Get full text
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Summary:Radioactive decay of an unstable isotope is widely believed to be exponential. This view is supported by experiments on rapidly decaying isotopes but is more difficult to verify for slowly decaying isotopes. The decay of ...C can be calibrated over a period of 12550 years by comparing radiocarbon dates with dates obtained from dendrochronology. It is well known that this approach shows that radiocarbon dates of over 3000 years are in error, which is generally attributed to past variation in atmospheric levels of ...C. Aston notes that predicted atmospheric variation (assuming exponential decay) does not agree with results from modelling, and that theoretical quantum mechanics does not predict exact exponential decay. Aston gives mathematical arguments that non-exponential decay should be expected for slowly decaying isotopes and explore the consequences of non-exponential decay. Aston proposes an experimental test of this prediction of non-exponential decay for ...C. If confirmed, a foundation stone of current dating methods will have been removed, requiring a radical reappraisal both of radioisotope dating methods and of currently predicted dates obtained using these methods. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0295-5075
1286-4854