Physics of diagnostic radiology

Apr 8th, 2015
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Study guide on diagnostic radiology

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PRINCIPLES OF PHYSICS OF DIAGNOSTIC RADIOLOGYLearning objectives At the end of this session the student should be able to: Describe simple atomic theory Describe the structure of an atom Describe the process of ionization of atomsSIMPLE ATOMIC THEORYOUTLINE08-09-2012 Structure of the Atom The Nucleus Atomic shells Electrons in shells Electron binding energies Ionization and excitation of atoms Emission of EM radiation from atomsATOMIC STRUCTUREMade up of a centralnucleus surrounded byorbiting electrons Electrons orbit thenucleus in confinedspaces called shells No electrons in spacesbetween the shellsTHE NUCLEUS A tiny positively charged mass at the centre of the atom Made up of protons(+ve charge) and neutrons(no charge) 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 nuclearchargeNUCLEUS cont Sum of proton numbers and neutron numbers iscalled the mass number(A)Nearly all of the atoms mass is contained in thenucleusElectron mass=1/1840 mass of a proton or neutron. It isthe smallest unit of electric chargeCharge of proton= charge of electron but in oppositesignIn a neutral atom number of electrons=number ofprotons in the nucleusAtomic shells cont The shell nearest the nucleus is called K shell, othersin order of increasing di

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