Across
- 2. The average energy locally deposited in an absorber resulting from a charged particle per unit distance of travel (keV/cm)(Abbr)
- 3. produced by beta particles undergoing Bremsstrahlung interactions.
- 8. __________ with ionization is one of the three major mechanisms of energy transfer for beta particulate radiation.
- 11. Absorption of these particles is one of the two major mechanisms of energy transfer for alpha particle radiation.
- 13. The minimum energy of a photon required to convert all it's energy to mass is 1.022 ___ (Abbr)
- 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.
- 15. Neutrons with an energy between 0.5eV and 10keV.
- 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.
- 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.
- 19. Neutrons with an energy of <0.5eV
- 20. __________ and excitation are the major mechanisms of energy transfer for alpha particle radiation.
- 22. Neutrons with an energy greater than 20MeV
- 24. The average penetration depth into an absorber before it loses all its kinetic energy and stops.
- 25. The definition of the number of ion pairs formed by the particle per unit path length (2 words)
- 26. radiative energy loss of moving charged particles as they interact with the matter through which they are moving
Down
- 1. The photoelectric effect is an ___ ___ _______ energy loss. (3 words)
- 4. __________ capture with a gamma emission and is the most common type of neutron interaction.
- 5. The ability to remove energy from a beam of charged particles.
- 6. Best shielded by High-Z and high-density material such as lead, steel, depleted uranium, and tungsten.
- 7. The average amount of energy needed to produce an ion pair in a given medium.
- 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.
- 9. Occurs when the full energy of a photon is converted to mass.
- 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).
- 12. Best shielded by low-Z materials such as rubber, plastic, aluminum, and glass.
- 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.
- 17. Neutrons with an energy between 10keV and 20MeV
- 21. Best shielded by Hydrogenous material for moderation and capture material for absorption.
- 23. Unbound, these particles are unstable and decay via beta emmission with a half-life of approximately 10.6 minutes.