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7. Ch 9 Basic Radiation Protection and Radiobiology.pptx -...

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BasicRadiationProtection andRadiobiologyCHAPTER 9: ADLER AND CARLTON
ObjectivesIdentify the sources of ionizing radiation.List the units used to measure radiation exposure and theircorrect use.Describe the sources of radiation exposure.Explain the ways in which ionizing radiation interacts with matter.Discuss the various practices used to protect the patient andoccupational worker from excessive radiation.Describe several devices used to detect and measure exposureto ionizing radiation.
Ionizing RadiationThe two basic sources of Ionizing radiation include:1.Natural- background sourcesex. Sun, elements of the earth such uranium and radium)2. human-made (artificial) radiation sourcesex. Nuclear industry, dental exposures, x-rays
Human – Made Ionizing RadiationIn order for x-rays to be produced, three things mustbe present:1. source of electrons – cathode (filament-mA)2. means to rapidly accelerate the electrons (kv)3. something to rapidly stop the electronmovement
Radiation as an IonizingEnergyRadiation has sufficient energy to causethe ejection of electrons from atoms.Loss of electrons results in ionization ofatoms.Ionization can have biologic effects.Benefits must outweigh the risks of anyx-ray diagnostic study.
X-Ray BeamX-ray beam leaving the x-ray tubetoward patient is primary beam.X-ray beam can undergo three possiblepaths:Total absorptionPass through with no loss of energy ortransferTransfer energy and undergo scattering andsecondary interactions with some loss ofenergy
Types of X-ray interactions1. Classic coherent Scattering- no energy transfer topatient2. Photoelectric interaction- patient exposure3. Compton scatter- occupational exposure4. Pair production- doesn’t occur in diagnostic xrayranges5. Photodisintegration –nuclear radiation

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Term
Fall
Professor
self
Tags
REM, Ionizing radiation, Gamma ray, Radiobiology, Acute radiation syndrome

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