Posted by amy on Thursday, February 3, 2011 at 1:59pm.
A meteorite has landed at UOIT! Chemical analysis shows that it contains 1
gram of potassium and 1E5 grams of argon, assumed to be present entirely
from the decay of K40. Assuming that no argon has escaped the meteorite,
estimate the age of the meteorite.
Data given:
Natural potassium has an atomic weight of 39.089 and contains 0.0118 atomic
percent K40, which has 2 decay modes:
40
K →40
Ca + β +antineutrino
40
K + e

→40
Ar* + neutrino →40
Ar + γ
On average there are 12 gammarays emitted to every 100 betaparticles
emitted.
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