RAD 2.4.txt

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RAD 2.4.txt
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2014-06-07 11:25:14
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  1. DESCRIBE THE THREE PRIMARY ELECTRIC FIELDS INTERACTIONS
    • ionization
    • excitation
    • bremsstrahlung
  2. DESCRIBE THE THREE PRIMARY ELECTRIC FIELDS INTERACTIONS
    IONIZATION
    ionization- the process of adding or removing atomic or molecular electrons to produce one or more ions
  3. DESCRIBE THE THREE PRIMARY ELECTRIC FIELDS INTERACTIONS
    EXCITATION
    excitation- the process of adding energy to the nucleus or electron cloud causing it to transition from a ground state to an excited state 
  4. DESCRIBE THE THREE PRIMARY ELECTRIC FIELDS INTERACTIONS
    BREMSSTRAHLUNG
    bremsstrahlung- occurs when high speed charged particles undergo radial acceleration (negative acceleration or deceleration) due to change in the direction of travel
  5. DESCRIBE THE INTERACTION OF BETA RADIATION WITH MATTER
    beta particles are charged, they lose energy in passing through material, both by interactions with the electric fields of orbital electrons and by direct collision.
  6. DESCRIBE THE INTERACTION OF ALPHA RADIATION WITH MATTER
    alpha particles interact wit orbital electrons of matter both through direct collision and by electric field interactions.
  7. DESCRIBE THE INTERACTION OF PHOTON RADIATION WITH MATTER
    • photoelectric effect
    • compton scattering
    • pair production
  8. PHOTOELECTRIC EFFECT
    incident photon energy is transfererd completely to an inner shell electron. the photon disapear and the electron is released
  9. COMPTON SCATTERING
    interacts with an outer shell electron that has binding energy much lower than than the photon energy. only part of the photon energy is transferred to the orbital electron. the photon changes direction and loses energy
  10. PAIR PRODUCTION
    high energy photon interacts with the electric field at the nucleus of an atom. when this happened the gamma ray disappears and a pair of electrons is created, one negative and one positive 
  11. DESCRIBE THE INTERACTION OF FAST NEUTRONS WITH MATTER
    elastic scattering and inelastic scattering are the process by which fast neutrons produce dose in tissue
  12. ELASTIC SCATTERING
    all the energy remains in the form of kinetic energy motion
  13. INELASTIC SCATTERING
    occurs if some of the collision energy is used to raise the target nucleus into a higer nuclear energy level. subsequently the nuclues will de-excite with the nucleus emission of a gamma ray  
  14. DEFINE INTERACTION OF THERMAL NEUTRONS WITH MATTER
    • radioactive capture
    • charged particle emissions
    • fission
  15. RADIOACTIVE CAPTURE
    a neutron is captured by the nucleus and one more gammarays are emitted
  16. CHARGED PARTICLE EMISSIONS
    a neutron is captured by the nucleus and the excess energy of the nucleus is given off in the form of a charged particle
  17. FISSION
    a neutron is captured by the nucleus, the resulting nucleide is unstable due to the excess mass-energy of the neutron, and the nucleus decays by separating into two pieces, called fission fragments releasing energy

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