The term half-life represents the time it takes:
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Which of the following statements are true about decay rates andhalf-lives?1)Much of the heat generated near the core of Earth is believed tobe due to radioactive decay.2)A large decay constant implies a short half-life.3)Radioactive nuclei decay over time according to an exponentialdecay law.4)Half-life is the time it takes for a radioactive sample to decayaway to nothing.5)A large decay constant means that the isotope has a lowactivity.6)In carbon dating, the radioactive isotope of carbon that is usedis carbon-14 (14C).
How much radioactive material 99mTc would you need to ship from a supplier of radiopharmaceuticals if you need a dose of 4mCi for a patient at 3:00pm and it takes five (5) hours to get the material to the hospital? (99mTc decays by gamma emission and has a half-life of 6.0 hrs.)
