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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Definitions:

Equilibrium Quantity

The quantity of goods or services that is supplied and demanded at the equilibrium price in a market.

Demand Curve

A graph showing the relationship between the price of a good and the quantity demanded by consumers over a range of prices.

Equilibrium Price

The cost where the amount of products offered matches the amount of products sought by consumers.

Equilibrium Quantity

The quantity of goods or services supplied is equal to the quantity of goods or services demanded at the market equilibrium price.