Finding isotope activity from mCi, mR or Rem measurements at a distance

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exradioa
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Hi all,

how can I find the activity of isotope which it has in area given value mCi or mR or Rem value of this? ionization energy of isotope how many distance can it travel on air and in earth-ground when I know only the Curi or Rem or Roengen?

ex. Who they calculate the hazardous-emergency distance from Fukushima accident?
 
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If you rephrased your question so it was more clear, perhaps we could help.