Strontium-90 Is a Byproduct in Nuclear Reactors Fuelled by the Radioisotope

question 107

Multiple Choice

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 y. What percentage of a strontium-90 sample remains after 75.0 y.?

• A)68.1
• B)16.4
• C)7.40
• D)38.4
• E)2.60

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Definitions:

Sorority Sisters

Members of a female student society in a university or college, characterized by a system of mutual support and a set of shared rituals and symbols.

Conscientiousness

A personality trait characterized by being diligent, careful, organized, and dependable.

Emotional Stability

Refers to a person's ability to remain calm and composed, especially in difficult situations.

External Locus

A psychological orientation where individuals attribute their successes and failures to external factors and influences rather than to their own efforts.