
#1
Nov2108, 03:10 PM

P: 69

how would i find the abundance of Pb 206, 207 and 208 if im given the isotopic data of 207Pb/206Pb and 208Pb/206Pb?




#3
Nov2408, 05:30 PM

Sci Advisor
HW Helper
PF Gold
P: 3,725

OK... Assume that the expression 206Pb means the molar fraction of lead206. The same is true for 207Pb and 208Pb. You know that the molar fractions sum to 1 as well as the molar ratios of 207Pb/206Pb and 208Pb/206Pb. You can also calculate 207Pb/208Pb. From here it is merely solving for the simultaneous equations.




#4
Nov2408, 07:05 PM

P: 69

how to find abundance of 206, 207 and 208 Pbthe Pb content is 468ppm 207Pb/206Pb= 0.2515 208Pb/206Pb= 0.0581 i could just use abgebra to find each right? 206=x 207=0.2515x 208=0.0581x i just solve for x and put it back into the previous equation? 


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