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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.

Poisson PDF •Radioactive decay and detection are Poisson random processes –Observation time is short compared to the half-life of the source •probability of radioactive decays (i.e., p) remains constant •probability of a given nucleus undergoing decay is small •Variance –Variance = mean = pN = x •Standard deviation

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