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September 2, 2015

Homework Help: nuclear physics

Posted by amy on Thursday, February 3, 2011 at 12:03am.

A researcher wishes to extract
140
La from
140
Ba. She obtains a 1000 MBq virgin
Ba-140 sample and must wait until the maximum activity of La-140 is available.

a) Write down the decay relationship (include half-lives), and
include the final stable product. How long must the researcher
wait until there is maximum
140
La available?

b)What activity of
140
La does she collect, is she extracts the
140
La
completely from the
140
Ba, when the
140
La is at maximum
activity?

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