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Yes, 0.5mg is a half of 1mg.
1mg. If the half life is 24 minutes then in 48 minutes the sample would decay twice. After one half life the mass would halve (to 2mg) and after the second it would have again (to 1mg).
1mg equals about 0.015gr
50mg is bigger than 1mg
That appears to be a safe bet, since a half of anythingmultiplied by 2 is always one of the same thing.