Originally we had planned to lower the activity of a gas stream containing radioactive Xe-138 (half-life =
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Originally we had planned to lower the activity of a gas stream containing radioactive Xe-138 (half-life = 14 min) by having it pass through two holdup tanks in series, both well mixed and of such size that the mean residence time of gas is 2 weeks in each tank. It has been suggested that we replace the two tanks with a long tube (assume plug flow). What must be the size of this tube compared to the two original stirred tanks, and what should be the mean residence time of gas in this tube for the same extent of radioactive decay?
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To determine the size of the long tube needed to achieve the same extent of radioactive decay as the two original stirred tanks we can use the concept ...View the full answer
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