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Ludwik!
ppb moles, atoms, molecules, etc.???
Plugging and chugging W/O much thought:
Activity = decay constant times number of nuclei
decay constant = half life / Ln(2)
37 GBq / Ci
Therefore N = 1.15 E+15 nuclei. Compare this to A = 6.022 E+ 23 nuclei per mole. I doubt very much you used Th metal. Th is most commonly? (IV), e.g ThCl(4)
bc missing something?
On 2009, Dec 25, , at 15:01, ludwik kowalski wrote:
Not trusting myself, I would like someone to confirm that the answer below is correct.
Question: Th-228 (half-life 1.913 years) is dissolved in water, at the concentration of 0.03 ppb. What is the activity of that isotope? (ignore activity of daughters).
Answer: 3.57*10^-4 Ci.
Thanks in advance,
Best wishes to all,
Ludwik
= = = = =
Ludwik's new book (AUTOBIOGRAPHY) see:
http://pages.csam.montclair.edu/~kowalski/mybook2.html
Share this link with those who might be interested. Thanks in advance.
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_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l