Project #59842 - Nuclear Engineering

1. The average mass of Potassium in human body is around 140g. The half-life of K-40 is 1.27e9 years. Estimate the average activity (in Becquerel) of K-40 in human body.

2. How many grams of U-235 are there in 1000kg of NATURAL URANIUM?

3. What (a)kinetic energy and (b)speed (as a fraction of 'c') would a proton have if its relativistic mass were 80% greater than its rest mass?----(given Proton rest mass= 938.27 MeV/c^2)

4. There is 57.0mCi  Cs-137 in a reactor. When the source was new it had an activity of 100.0 mCi. What was the date in which the radioactive source was bought?

5. The isotope I-132 decays to Xe-132 with a half-life of 2.3 hours.

(a) How long for 7/8 I-132 to decay?

(b) How long for I-132 to lose 95% of activity?

6. Assume we have to replace the exit Tritium signs of a building after their glow has reached 30% of their original glow. (Given tritium's half-life=12.32 years)

(a) If the glow is proportional to activity, how long (in Years) before they have to replace their signs?

(b) How much money (in Dollars) in electricity per sign would have been during that time, if an equivalent sign with incandescent bulbs consumes 40W (assume 1kW costs 10cents)

Subject Science
Due By (Pacific Time) 03/01/2015 12:00 am
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