Please solve the following problem!A huge amount of radioactive iodine (131I) andcaesium(137Cs) was released into the environment during the accident on 11thMarch, 2011 at Fukushima nuclear power plant. These unstable radioactive isotopesexponentiallydecay to stable daughter element. The half-life of131I is 8 days, while the half-life of 137Cs is 30 years.What percentage of theoriginal137Csand131I isotopes (in percent) is retained after 4 years?

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