AQA physics radioactive decay

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2022 g
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Plutonium-239 is a radioactive isotope that emits α particles of energy 5.1 MeV and decays
to form a radioactive isotope of uranium. This isotope of uranium emits α particles of
energy 4.5 MeV to form an isotope of thorium which is also radioactive.

Which of the two radioactive isotopes, Plutonium-239 or the uranium isotope has the longer half life? Give a reason for your answer.
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Joinedup
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Did you do the Geiger-Nuttall relationship?

The shorter lived an α emitting isotope is, the more energetic are the α particles it emits.
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(Original post by Joinedup)
Did you do the Geiger-Nuttall relationship?

The shorter lived an α emitting isotope is, the more energetic are the α particles it emits.
Ive never heard of the Geiger-Nuttall relationship.
But the “The shorter lived an α emitting isotope is, the more energetic are the α particles it emits” makes sense. TY!
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