physics of diagnostic radiology

Jun 14th, 2016
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Aerobics and Fitness Association of America (AFAA) Distance Education Center
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the content in this slide gives a coherent and logic description for a student to understand the physics behind x ray production and application in contemporary medicine.

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PRINCIPLES OF PHYSICS OFDIAGNOSTIC RADIOLOGYDR C. A. ODENYLearning objectivesAt the end of this session the student should be able to:Describe simple atomic theoryDescribe the structure of an atomDescribe the process of ionization of atomsStructure of the AtomThe NucleusAtomic shellsElectrons in shellsElectron binding energiesIonization and excitation of atomsEmission of EM radiation from atomsATOMICSTRUCTUREMade up of a centralnucleus surrounded byorbiting electrons Electrons orbit thenucleus in confinedspaces called shells No electrons in spacesbetween the shellsA tiny positively charged mass at the centre of theatomMade up of protons(+ve charge) and neutrons(nocharge)The number of protons is called the atomic number(Z)Atomic number determines nuclear charge and atomicchemistry.The higher the atomic number the greater the nuclearchargeSum of proton numbers and neutron numbersis called the mass number(A)Nearly all of the atoms mass is contained inthe nucleusElectron mass=1/1840 mass of a proton orneutron. It is the smallest unit of electric chargeCharge of proton= charge of electron but inopposite signIn a neutral atom number of electrons=numberof protons in the nucleusThe shell nearest the nucleus is called K shell,others in order of increasing distance from thenucleus are L,M,N etc.She

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