Asked Oct 23, 2019

One of the nuclides in spent nuclear fuel is U-235, an alpha emitter with a half-life of 703  million years.  How long will it take for the amount of U-235 to reach 10.0% of the initial amount?


Why is it not ln(90/100) instead of ln(10/100)?


Expert Answer

Step 1

The relationship between the decay constant and the half-life period is given below.

Step 2

The decay constant of U-235 can be calculated as shown below.

Step 3

The nuclear disintegration time can be calculated as shown below.


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Inorganic Chemistry

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