Half Life Problems
obbgun11
label
Chemistry
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Asked: Dec 14th, 2018
Question Description
There are just a couple of chemistry problems I cannot figure out.
Please help. Thanks!!
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Technetium-99m is an important isotope used in medical imaging (the m stands for metastable). Each
day healthcare professionals around the world use Technitium-99m in thousands of medical scans. This
material has a very short half-life of about 6 hours and decays by gamma decay to Technitium-99. In
this exercise, we will look at why half-life is an important concern and how it effects our health.
1.
Technetium-99m has a half-life of 6 hours. Use this to answer the following questions:
a. What percentage of an injection of Technituum-99m would remain in your body 24
hours after injection?
b. In terms of radiation exposure, why is this short half-life beneficial?
2. Due to the short half-life of Technetium-99m, this material cannot be easily transported.
However, Molybdenum-99 undergoes beta decay to form technetium-99m and has a half-life of
about 2.75 days. Unfortunately, the world’s supply of molybdenum-99 is in jeopardy as the
nuclear facilities that produce this material are beginning to cease operations. Use this
information to answer the following questions:
a. Show the beta decay of Molybdenum-99
b. If you have a 100 gram sample of Molybdenum-99, how many grams will remain after
11 days?
c. Would a good solution to the coming shortage of Molybdenum-99 be for hospitals to
stock pile large amounts of Molybdenum-99? Why or why not?
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