Strontium-90 Is Produced in Nuclear Fission Reactors

question 69

Multiple Choice

Strontium-90 is produced in nuclear fission reactors.If ingested it can replace calcium in the bones.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 7.8 disintegrations per second?

• A) 98 years
• B) 67 years
• C) 46 years
• D) 56 years
• E) 77 years

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A term historically used to describe people of European descent, though its accuracy and appropriateness in describing ethnicity are debated.

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