What Is the Time Needed for the Activity of a Radium-226

question 65

Multiple Choice

What is the time needed for the activity of a radium-226 source to change from 1.5 Ci to 0.50 Ci? (The half-life of radium-226 is 1.60 * 10³ y.)

• A)5.33 * 10² y
• B)1.60 * 10³ y
• C)1.10 * 10³ y
• D)9.36 * 10² y
• E)2.54 * 10³ y

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