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[Phys-l] thorium-228



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.