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

question 70

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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