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The photon source is a point isotropic with 1 MeV energy. The source strength is 1010 photons per second. Consider the linear attenuation factor of Pb for 1 MeV photon is approximately (E = 1 MeV) = 1 cm-1 and the corresponding dose buildup factor Br(5r = 1,E = 1 MeV) for a point source is 1.37. Neglect any attenuation by the air. (including the unit of results) <Solution> a) The uncollided flux (7 points) b) The observed flux (7 points) Problem 2 (20 points) : Briefly explain the following terms. a) LET (3 points) <Solution> - The acronym of Linear Energy Transfer - The energy loss per unit length due to collisions, which give rise to excitation and ionization - Special interest in connection with the biological effects of radiation b) stopping power (4 points) <Solution> The total energy lost per path length by a charged particle ( = The total rate of decrease in the energy of the particle along its path ) c) specific ionization (3 points) <Solution> - where, w = mean energy expenditure per ion pair. - The number of ion pairs produced per unit path traveled by the particle d) Bremsstrahlung (4 points) <Solution> The radiative loss of energy which appears as the continuous electromagnetic radiation produced by inelastic scattering of beta particle with nuclei e) photo-electric effect (3 points) <Solution> The total absorption of photon by absorber atoms and subsequent ejection of orbital electron f) Compton effect (3 points) <Solution> The elastic scattering of photon with atomic orbital electron Problem 3 (20 points) : Briefly explain the interactions of beta, alpha, and electromagnetic radiations with matter. <Solution> (1) 5-ray interaction with matter (7 points) 6 Collision with atomic electrons : ionization, excitation (dominates in few Mev region) 6 Collision with nucleus : bremsstrahlung - the radiative loss of energy which appears as the continuous electromagnetic radiation  _