Asked by Massiel
                 If in August 1911 Mme. Curie prepared an international standard containing 
20.00 mg of RaCl2, what will the radium content of this standard be in August 2010?
            
        20.00 mg of RaCl2, what will the radium content of this standard be in August 2010?
Answers
                    Answered by
            bobpursley
            
    Halflife of radium 222 is 1601 years.
content=20mg*e^(-ln2*t/1601) and t= 99 years
content= 20.00 e^(-4.286E-2)=1.168 check that.
    
content=20mg*e^(-ln2*t/1601) and t= 99 years
content= 20.00 e^(-4.286E-2)=1.168 check that.
                    Answered by
            Massiel
            
    Thanks!
    
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