U235 Dating Calculator

Calculates the dating in the past from the ratio of Uranium 235 in natural uranium.

Current ratio of U235 in natural uranium is the same anywhere in the solar system.
Because the half-life is different with U238 and U235, the higher the percentage of U235 so retroactively.
U235 Dating
ratio at the dating
   U235
%
ratio at the present
   U235
%half-lifebyr(109)
   U238
%half-lifebyr
 
The enrichment ratio of U235 to be used in a nuclear reactor is about 3%, it is the same as the existing ratio of U235 2 billion years ago.
The presence of natural reactor was predicted and found for this reason.

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