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Problem_Set_6_2009-2

# Problem_Set_6_2009-2 - 22:01 Introduction to Ionizing...

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22:01 Introduction to Ionizing Radiation Problem Set 6 Date Due: Thursday 5 November 2009 http://atom.kaeri.re.kr/cgi-bin/endfplot.pl Here is a good web site for neutron interaction cross- section data. [Using the MCNP library (list on the bottom of the page) is a good choice.] 1. If the absorption coefficient of the high-energy component of cosmic radiation is 2.5 x10 -3 per meter of water, calculate the reduction in intensity of these cosmic rays at the bottom of the ocean, at the depth of 10,000 m. What can you say bout the range of these high-energy photons in water? 2. Assume that a parallel beam of 3 MeV gammas and a parallel beam of 2 MeV neutrons impinge upon a piece of lead 50 mm thick. What fraction of photons and what fraction of neutrons will emerge on the other side of this shield without any interaction. Based on your result, what can you say about the effectiveness of lead as a shield for gammas or neutrons? [ σ (2 MeV) = 3.5 b.] 3. Gamma rays interacting with 9 Be or 2 H produce “photoneutrons”.

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