document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1201553>Question 1201553</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The radioactive isotope of potassium-42, which is vital in the diagnosis of brain tumors, has a half life of 12.36 hours.\r<BR>\n" );
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document.write( "How long will it take for the original 500 mg sample to decay to a mass of 5 mg? </SPAN>\n" );
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