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Quiz_6_Solutions - Name gm By S PSUID The Pennsylvania...

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Unformatted text preview: Name gm By, S PSUID The Pennsylvania State University, Department of Mechanical and Nuclear Engineering NUC E 301: Fundamentals of Reactor Physics Fall Semester 2011 Quiz 6 2 October 5, 2011 1. (ypts) How do the following events affect the probability (increase, decrease, or no change - circle the correct answer) that an unstable nucleus decays in a 10—minute time interval? a. The nucleus had very recently been produced from the radioactive decay of its parent. INCREASE DECREASE NO EFFECT b. The nucleus has existed for several thousand years without decaying. INCREASE DECREASE NO EFFECT W x l (SM/ml { 2. (1 pt) On average, for how many seconds will an unstable nucleus with a decay constant of 3 min“1 live? L73 3. (1 pt) Isotope A has a very short half—life compared to isotope B. Assuming both samples start with the same number of atoms, sketch the relative activity of each isotope as a function of time. Activity Time 4. (2 pts) Which two processes that typically occur in the excited atom following electron capture? X”MQ awn/(scam owl My dual/ma 6 mg {9.6% 5. (1 pt) Fill in the equation to show what happens during the internal conversion process. 203 + I 203Tl*—> TC + fl ...
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