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RT 140 Ch.2

Radiation Protection

QuestionAnswer
Bremssthralung An e- undergoes rapid deceleration and deflection as it nears the vicinity of an atoms nucleus.
Characteristic Radiation Outer orbital electron or free electrons fill in inner orbital shell vacancy
Filtration Process by which low energy photons are absorbed. *Hardening the Beam and decrease skin dose
Photon Energy Energy of e- in tube expressed as voltage applied to x-ray tube
Attenuation The reduction in the number of primary photons in the x-ray beam through absorption and scatter.
Half Value Layer (HVL) This is that amount of absorber that, if place in the path of the beam, will reduce the initial intensity by half, if measured at the same DISTANCE FROM THE SOURCE
Lambert Beer Law If = Ii e^ -μx
Exit (Image formation) Photons Photons emerging from medium and strike radiographic image receptor
Coherent Scatter Atom/electrons react to electromagnetic waves: absorbs energy, which “excites” atom
Photoelectric Effect is a relationship of As Z increases, PE interaction Increase’s due to Z^3/ E^3 * If we ↓ Energy of incident photon and ↑ Z, the probability of PE interaction ↑
Compton Interaction Photon energy is transferred to a “Free” or “Loosely Bound” outer orbital electron
Pair Production *They have on charge and no mass *Energy needed is 1.02Kev ↑
Photodisintegration Need energy of 7-10 MeV
Coherent Scattering is sometimes called? Classical, elastic, & unmodified scatttering
Coherent Scattering typically happen at what energies? Low energy photons less than 30keV
Compton Scattering is also known as? Incoherent, inelastic, & modified scattering.
Fluorescent Yield Refers to the number of characteristic x-rays emitted per inner shell vacancy.
What is the effective atomic number for bone, soft tissue,& air? *Bone 13.8 Zeff *Soft tissue 7.4 Zeff *Air 7.6 Zeff
Radiographic density The degree of overall blacking on the finished radiograph
Created by: kayg
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