1. Interaction of charged particle with Matter 11. Expl

1. Interaction of charged particle with Matter 11. Explain the range for Alpha and electron beam. [1] 1.2. Why the Bragg peak cannot be observed exactly for light charged particles compared to the heavy charged particles such as proton and Alpha beam? [1] 1.3. What is the mass stopping power ratio for Alpha particles and a proton beam with the same kinetic energy? [2] 1.4. What do you understand by the Continuous Slowing Down Approximation (CSDA)? [2] 1.5. Explain your understanding about energy straggling. [2] 1.6. What is the difference between ionization in gases and in solids? [2] 2. Radiation dosimetry 2.1. Explain the difference between Kerma and Air Kerma rate. [1] 2.2. What is the relationship between Exposure and absorbed dose? [2] 2.3. Explain the difference between absorbed dose equivalent dose and effective dose. [1] 2.4. Why Build-up layer is important factor in Radiation Therapy? [1] 2.5. Explain the basic principle differences between dosimetry of high energy photons and high energy electrons. [2] 2.6. For the same kinetic energy explain which of these particles will cause larger radiation exposure that is more detrimental to humans? [1] 2.7. Find the radiated and absorbed energies for a 10 MeV electron brought to rest in water and in bone (use table A6 of the appendix in Johns and Cunningham). [3]

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