homework physics
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Discuss operation of a Canberra MCA system.
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A Canberra MCA system is an example of a Pulse Height Analyzer (PHA). Discuss operation of
a PHA and how they are used to detect radiation. Discuss differences between single channel
(SCA) and multiple channel analyzers (MCA).
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Explain what causes voltage pulses within a Canberra MCA system. Make mention photon
interactions with NaI (sodium iodide) crystals and amplification processes found in
photomultiplier tubes.
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Discuss the characteristics of pulse height spectra (i.e. photopeaks, Compton effects,
Bremsstrahlung).
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Discuss the linear attenuation equation seen here,
I = I0e−μd
I = Number of Photons Penetrating a Thin Slab of Matter of Thickness (d)
I0 = Number of Photons in a Beam Before Thin Slab of Matter is Placed in Position d = Path Length or Distance Through Thin Slab of Matter
μ = Attenuation Coefficient of a Particular Medium for Photons6. Discuss the principal types of x-ray and γ-ray photon interactions with matter (i.e. Compton scattering, photoelectric absorption).
7. Define attenuation.
8. State the variables that influence photoelectric and Compton interactions.
9. Define a linear attenuation coefficient and a mass attenuation coefficient.
10. Discuss how these coefficients change with energy of a photon and the density of a material.