Strontium-90 Is Produced in Nuclear Fission Reactors

question 50

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 9.2 disintegrations per second?

• A) 91 years
• B) 67 years
• C) 46 years
• D) 54 years
• E) 78 years

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Definitions:

Abnormal Dilations

unusual expansions or widenings of vessels, cavities, or organ passages in the body.

Metabolism

The set of life-sustaining chemical reactions in organisms that involve the conversion of food to energy, the construction of proteins and nucleic acids, and the breakdown of waste products.

Fats

Nutrients that give energy, support cell growth, and help in the absorption of certain vitamins.

Niacin

A water-soluble B vitamin (B3) that is essential for energy metabolism and the health of the nervous system, skin, and digestive system.