Refer to the Graphic Below

question 28

Multiple Choice

Refer to the graphic below.Which of the following isotopes would be the safest to handle in the shortest period of time? (Radioactive isotopes are considered safe to handle after 10 half-lives.)

• A)uranium-234
• B)uranium-238
• C)thorium-234
• D)thorium-226
• E)protactinium-234

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