Transcription of Radiation Detection and Measurement
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Radiation Detection and Measurement
Rad. Detect & Measure, 2008 (TKL) Radiation Detection andMeasurementJune 2008 Tom Detect & Measure, 2008 (TKL)Types of Radiation relevant toNuclear MedicineParticleSymbolMass (MeV/c2) ChargeElectrone-, ! -1 Positrone+, !+ +1 Alpha" 3700 +2 Photon# no rest mass noneRad. Detect & Measure, 2008 (TKL) Loses energy in a more or less continuous slowing downprocess as it travels through matter. The distance it travels (range) depend only upon its initialenergy and its average energy loss rate in the medium. The range for an " particle emitted in tissue is on the orderof m s." Particle Range in Mattermono-energetic- - - - - - - - - - - - - - - - - - -+ + + + + + + + + + + + + + + + + m s"Rad. Detect & Measure, 2008 (TKL) ! particle ranges vary from one electron to the next, even for !s ofthe same energy in the same material.
Compton scattering part of the energy of the photon is absorbed scattered photon continues on with lower energy Pair production positron-electron pair is created requires photons above 1.022 MeV Coherent (Rayleigh) scattering photon deflected with very little energy loss only significant at low photon energies (<50 keV) $ cm’s N 0 N x
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