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

question 93

Multiple Choice

Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235.The $\text { half-life }$ of $\text { strontium-90 }$ is 28.8 y.What percentage of a strontium-90 sample remains after 85.0 y.?

• A)33.9%
• B)2.95%
• C)87.1%
• D)0.129%
• E)12.9%

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Definitions:

Units-Of-Production Method

A method for determining depreciation that distributes depreciation based on how much the asset is used.

Scrap Value

Scrap value is the estimated residual value of an asset at the end of its useful life, typically in terms of its material components.

Scrap Value

The estimated residual value of an asset at the end of its useful life, often considered when an asset is to be disposed of or recycled.

Units Of Production

A method of depreciation that calculates the expense based on the actual usage or production levels of an asset.