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2
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0answers
46 views
Why does the metastable form of Technetium-95 have a longer half-life than its most stable state? [migrated]
I was looking at the isotopes of technetium page on Wikipedia recently, and it seems that the metastable $\ce{^{95m}Tc}$ has a substantially longer half-life (61d) than its most stable state of ...
-1
votes
1answer
66 views
Isotopes question
I am legitimately stuck.
"A sample of biotite contains 788 ppm of $\ce{^40K}$ and 630 ppm of $\ce{^40Ar}$. What % of the original parent isotope remains?"
an explanation of how this is solved would ...
7
votes
1answer
218 views
What is deuterium-depleted water actually used for?
I noted, flipping through the paperback Alfa Aesar catalogue today, that they sell deuterium-depleted water. Under the usage category, they list 'NMR'. I'm trying to work out what specific use this ...
7
votes
4answers
154 views
Is there a simple field test for heavy water?
Thought experiment
Given two glasses of water, how would one detect which glass contains heavy water, and which contains potable water without using complicated laboratory equipment?
Something like ...
