Core Academics Chapter 7: Interaction of Radiation with Matter

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Across
  1. 2. The average energy locally deposited in an absorber resulting from a charged particle per unit distance of travel (keV/cm)(Abbr)
  2. 3. produced by beta particles undergoing Bremsstrahlung interactions.
  3. 8. __________ with ionization is one of the three major mechanisms of energy transfer for beta particulate radiation.
  4. 11. Absorption of these particles is one of the two major mechanisms of energy transfer for alpha particle radiation.
  5. 13. The minimum energy of a photon required to convert all it's energy to mass is 1.022 ___ (Abbr)
  6. 14. Scattering which occurs when a neutron strikes a large nucleus, transfers energy to a nucleon, then exits the nucleus with only a small decrease in energy.
  7. 15. Neutrons with an energy between 0.5eV and 10keV.
  8. 16. In this type of scattering there is a partial loss of energy for the incoming photon being transferred to an atom's orbital electron.
  9. 18. Best shielded by small amounts of most any material such as paper, a layer of unbroken skin cells, or a few cm of air.
  10. 19. Neutrons with an energy of <0.5eV
  11. 20. __________ and excitation are the major mechanisms of energy transfer for alpha particle radiation.
  12. 22. Neutrons with an energy greater than 20MeV
  13. 24. The average penetration depth into an absorber before it loses all its kinetic energy and stops.
  14. 25. The definition of the number of ion pairs formed by the particle per unit path length (2 words)
  15. 26. radiative energy loss of moving charged particles as they interact with the matter through which they are moving
Down
  1. 1. The photoelectric effect is an ___ ___ _______ energy loss. (3 words)
  2. 4. __________ capture with a gamma emission and is the most common type of neutron interaction.
  3. 5. The ability to remove energy from a beam of charged particles.
  4. 6. Best shielded by High-Z and high-density material such as lead, steel, depleted uranium, and tungsten.
  5. 7. The average amount of energy needed to produce an ion pair in a given medium.
  6. 8. Scattering which occurs when a neutron strikes a nucleus approximately the same size as the neutron and transfers much of it's kinetic energy.
  7. 9. Occurs when the full energy of a photon is converted to mass.
  8. 10. The process that adds enough energy to an electron of an atom or molecule so that it occupies a higher energy state binding energy than its lowest bound energy state (ground state).
  9. 12. Best shielded by low-Z materials such as rubber, plastic, aluminum, and glass.
  10. 14. The process resulting in the removal of a bound electron from an electrically neutral atom or molecule by adding enough energy to the electron to overcome its binding energy.
  11. 17. Neutrons with an energy between 10keV and 20MeV
  12. 21. Best shielded by Hydrogenous material for moderation and capture material for absorption.
  13. 23. Unbound, these particles are unstable and decay via beta emmission with a half-life of approximately 10.6 minutes.