Physics and Engineering of Radiation Detection
76 Chapter 2. Interaction of Radiation with Matter whereprepresents the momentum. The subscriptsiandfstand for the initial and ...
2.2. Types of Particle Interactions 77 An interesting point to note here is that when we talk about the behavior of radiation pa ...
78 Chapter 2. Interaction of Radiation with Matter The annihilation process in itself does not have any threshold energy. That i ...
2.2. Types of Particle Interactions 79 Eγ= 511 keV Eγ= 511 keV − Figure 2.2.1: Depiction of electron- positron annihilation ...
80 Chapter 2. Interaction of Radiation with Matter If an electron is accelerated through a potentialV (as in x-ray machines), th ...
2.2. Types of Particle Interactions 81 It is also possible that a high energy charged particle with non-zero rest mass, such as ...
82 Chapter 2. Interaction of Radiation with Matter Herem 0 c^2 is simply the rest energy of the particle. For an electron and a ...
2.3. Interaction of Photons with Matter 83 Photon Energy 1 Mb 1 kb 1 b 10 mb 10 eV 1 keV 1 MeV 1 GeV 100 GeV (b) Lead (Z = 82) − ...
84 Chapter 2. Interaction of Radiation with Matter explained this effect by arguing that light is transferred to the material in ...
2.3. Interaction of Photons with Matter 85 K Photon Incident X−ray Photon L Photoelectron Orbital Electron Figure 2.3.2: Depicti ...
86 Chapter 2. Interaction of Radiation with Matter σThis called Thompson scattering cross section. An interesting aspect of phot ...
2.3. Interaction of Photons with Matter 87 Example: Calculate the wavelength below which it would be impossible for photons to i ...
88 Chapter 2. Interaction of Radiation with Matter λ 0 Incident Photon Scattered Electron λ θ φ Scattered Photon Figure 2.3.4: C ...
2.3. Interaction of Photons with Matter 89 By adding equations 2.3.11 and 2.3.11 together and using the trigonometric identity s ...
90 Chapter 2. Interaction of Radiation with Matter pecosφ pesinφ Incident Photon pe 0 =0 =h/ λ pγ pγcosθ pγsinθ pe pγ 0 =h/λ 0 θ ...
2.3. Interaction of Photons with Matter 91 Case-3 (θ= 180^0 ):It is obvious from equation 2.3.15 that a photon scattered atθ= 1 ...
92 Chapter 2. Interaction of Radiation with Matter θ (deg) 0 50 100 150 200 250 300 350 (fm)λ ∆ 0 1 2 3 4 5 Figure 2.3.6: Angula ...
2.3. Interaction of Photons with Matter 93 Energy (keV) ~E −255γ Eγ Compton Edge Photopeak Backscatter Peak Events per Energy Bi ...
94 Chapter 2. Interaction of Radiation with Matter This corresponds to an energy of Ei = hc λi = ( 6. 62 × 10 −^34 )( 2. 99 × 10 ...
2.3. Interaction of Photons with Matter 95 Hereλ 0 is the wavelength of the incident photon,ais the radius of the target particl ...
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