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29 March, 11:02

Which radioisotope is used in dating geological

formations?

(1) I-131

(2) U-238

(3) Ca-37

(4) Fr-220

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Answers (1)
  1. 29 March, 13:32
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    (2) U-238 is the radioisotope used in dating geological formations. Uranium-238 has a half-life of 4.46 billion years, which makes it suitable to date such old formations.

    The other options do not have such long durabilities and half-lives.
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