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I have a problem that i do not know how to solve.

Activities from the fission products I(131) and I(133) were measured in the air of a city

28/4-1986 at 17:00. The result was 0,12 Bq/m3 and 0,39Bq/m3 for I(131) and I(133), respectively. These isotopes came from the chernobyl nuclear reactor disaster.

Use this information to calculate when the reactor container exploded. The relative amount

of I(131) and I(133) produced in the fission of U(236) is 2,892 and 6,686 percent, respectively.

I would appreciate it very much if someone could solve this problem.