Strontium-90 Is Produced in Nuclear Explosions

question 85

Multiple Choice

Strontium-90 is produced in nuclear explosions.It can replace calcium in the bone.The half-life of ⁹⁰Sr is 27.7 years.If the activity of ⁹⁰Sr in the bones of an exposed person were 90 disintegrations per second,how long would it take the activity of ⁹⁰Sr to decrease to 8.1 disintegrations per second?

• A)96 years
• B)66 years
• C)49 years
• D)59 years
• E)75 years

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