_{An Isotope of Tc Having a Half-Life of 6}

question 24

Multiple Choice

_{An isotope of Tc having a half-life of 6.0 h is used in bone scans.If a certain amount of this Tc is injected into the body,how long does it take for its initial decay rate to decrease BY 99%?}

• A)"_{0.060 h}"
• B)"_{3.3 h}"
• C)"_{33 h}"
• D)"_{40 h}"
• E)"_{slightly more than a month}"

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