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Lecture10-PropertiesOfX-rays

Lecture10-PropertiesOfX-rays - EMSE 312 DIFFRACTION...

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EMSE 312 – Diffraction Principles Lecture 10 Basic Properties of X-rays (EM- Waves) X-ray Generation – Intensity of X-rays Continuous Radiation – Characteristic X-rays X-ray Absorption – Filters X-ray Generation X-ray Detection EMSE 312 DIFFRACTION PRINCIPLES
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EMSE 312 – Diffraction Principles Continuous Radiation Intensity of X-ray Radiation X-rays are produced bay accelerating or decelerating charge (e.g. electrons) – Probability of interaction + + + + + + + + + + 1-Incoming electron 2-electron – electron Interaction 3-X-ray emission 4-Secondary electron emission
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EMSE 312 – Diffraction Principles Continuous Radiation λ ν E h ν = Intensity of X-ray Radiation X-rays are produced bay accelerating or decelerating charge (e.g. electrons) – Probability of interaction A = const i = current Z = Atomic Number V = Acc. voltage (eV) m = const approx. 2 34 h 6.62 10 Js = × Bremsstrahlung m I A i Z V = ⋅ ⋅
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EMSE 312 – Diffraction Principles Properties of X-rays Short Wavelength Limit All Kinetic energy converted to EM Radiation Max Max SWL h c E h ν λ = = SWL Max Acc h c h c E e V λ = = Example: Acc V 20kV = 34 8 10 SWL 19 6.62 10 Js 3.0 10 m /s 0.62 10 m 20,000 1.6 10 J λ × × = = × ×
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