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A patient is given 0.050mgof technetium-99m(where m means metastable - an unstable but longlived state), a radioactive isotope with a half-life of...

A patient is given 0.050mgof technetium-99m(where m means metastable - an unstable but longlived state), a radioactive isotope with a half-life of about 6.0 hours.

How long until the radioactive isotope decays to 7.8×10−4 mg ?


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Steps
1. First, change 7.8 x 10-4 to 0.00078.
2. 0.050 will become 0.025 in 6 hours. It will become 0.0125 in another six hours. When
will it become 0.00078??? Now, add all the six hour periods...

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