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Unformatted text preview: Duke University Medical Physics Program MP200 - Radiation Physics Fall 2010 Assignment 03 Due 10/04/10 ( Show your work for each problem. Partial credits are awarded.) 1. The integral R 1 xe x dx has the value of (a) 0 (b) 1 2 (c) 1 (d) 3 2 (e) 2 2. A 200 keV photon interacts in soft tissue. The energy deposited locally ( in the immediate vicinity of the interaction site) most likely comes from (a) the kinetic energy of a photon-electron (b) the sum of energies of scattered photon and recoil electron fol- lowing Compton scattering. (c) the kinetic energy of a recoil electron following Compton scat- tering.(Scattered photon will most likely deposit energy elsewhere). (d) kinetic energies of electron and positron following pair produc- tion, minus energy of two 511 keV annihilation quanta leaving the site.(pair production not possible below 1 . 022 MeV ). 3. What radiation absorbed dose of slow neutrons (RBE=2.5) is equiv- alent to a dose of 35 . rad of fast neutrons (RBE = 9.0)? (a) 320 rad (b) 260 rad (c) 160 rad (d) 130 rad (e) 9 . 7 rad 4. A beam of 4 . 5 MeV neutrons is directed at a 30 g tissue sample....
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