# 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.

 ratio at the dating U235 % ratio at the present U235 % half-life byr(109) U238 % half-life byr 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit
 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.$(1)\ x=x_0(\frac{1}{2})^{\frac{\normal t}{T}},\hspace{40}T:\ half\ time\\(2)\ t=-\frac{ln(\frac{x235}{100-x235}\frac{x238_0}{x235_0})}{ln2}\frac{1}{(\frac{1}{T235}-\frac{1}{T238})}\\$

U235 Dating
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[1]  2018/04/10 11:41   Male / Under 20 years old / Elementary school/ Junior high-school student / Useful /
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