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

question 156

Multiple Choice

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

• A)68.1
• B)16.5
• C)7.40
• D)38.4
• E)2.60

---

Definitions:

Bay of Bengal

A large body of water in the northeastern Indian Ocean bounded by Bangladesh to the north, Myanmar and the Andaman and Nicobar Islands to the east, and India to the west.

Sea Surface Temperatures

The temperature of the surface layer of the ocean, which varies geographically and seasonally, influencing weather and climate patterns.

Equator

An imaginary line around the Earth equidistant from the North and South Poles, marking the latitude 0°.

El Niño

A climate pattern that occurs in the Pacific Ocean, characterized by the unusual warming of surface ocean waters in the central and eastern tropical Pacific.