Calculate the Time Required for the Activity of a 9

question 6

Multiple Choice

Calculate the time required for the activity of a 9.0-mCi cobalt-60 source to decay to 8.5-mCi.The half-life of cobalt-60 is 5.26 years.

• A)4.6 months
• B)2.3 months
• C)5.2 months
• D)10 months
• E)0.090 months

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