Strontium-90 is a radioactive element that is produced in nuclear fission. It decays by decay to

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Strontium-90 is a radioactive element that is produced in nuclear fission. It decays by β− decay to yttrium (Y) with a half-life of 28.8 yr. 

(a) Write down the decay scheme for . 

(b) What is the initial activity of 2.0 kg of ? 

(c) What will be the activity in 1000 yr?

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