Problem_Set_7_2009-2

Problem_Set_7_2009-2 - 22:01 Introduction to Ionizing...

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22:01 Introduction to Ionizing Radiation Problem Set 7 Date Due: Tuesday 24 November 2009 1. (a) The mean concentration of potassium in crystal rocks is 27 g/kg. What is the 40 K activity in 1 ton of rock? (b) A 200 g banana contains 0.01 % potassium by weight. Calculate the activity of 40 K deposited in the body from eating one banana. (c) Calculate both the absorbed dose and the dose equivalent that results from eating one banana. (d) If you eat 1 banana/day for 50 years, what effect will they have on the specific activity of the potassium in your body? 2. (a) What is the total energy released when the 238 U nucleus and its unstable daughters decay into the stable nuclide 206 Pb? (b) Examine the 238 U decay scheme and, taking into consideration the mean lifetime of the individual members of this chain, estimate the fraction of the energy estimated in part (a) that will be released to your body during your life time. (c) Now include the uranium activity found in the body (see lecture notes). What is the total energy released to our body from the Uranium found in it, over your life time. (d) calculate the corresponding lifetime dose from the body’s uranium content.
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This note was uploaded on 03/09/2010 for the course 22 22.01 taught by Professor Smith during the Fall '09 term at MIT.

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Problem_Set_7_2009-2 - 22:01 Introduction to Ionizing...

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