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DOSM 415 Physics for Medical Dosimetry II • 5 Cr.


Explores radiation therapy physics with special attention to the physics of electron interactions, depth dose curves, shaping of radiation fields, radioactive sources, State and National regulations, radiation safety and physics acceptance testing and commissioning. Prerequisite: Acceptance into the program.


After completing this class, students should be able to:

  • By the conclusion of this course, the student will be able to:
  • • Define the difference between elastic and inelastic collisions between electrons and nuclei.
  • • Describe process of depth-dose determination using an ion chamber, diodes or film.
  • • Define field flatness and asymmetry along with acceptable limits for each.
  • • Calculate the dose to a point beyond an inhomogeneity using the coefficient of equivalent thickness method.
  • • Analyze the clinical application of bolus and other absorbers.
  • • For the following radioactive sources: Ra-226, Cs-137, Co-60, Ir-192, Au-198, Sr-89, I-125, Sm-153, Pd-103, I-131, and Sr-90
  • - Define and/or calculate:
  • o Type of emission
  • o Exposure Rate Constant
  • o Half-life
  • o Source Construction
  • o Photon Energy
  • o Source Specification
  • o HVL
  • o Average Life
  • • Assess the construction, limitations and considerations for:
  • o Well-type ionization chambers
  • o Free-air ionization chambers
  • o Thimble chambers
  • o Electrometers
  • o TLDs
  • o Diodes
  • • Define the role of the:
  • o Nuclear Regulatory Commission
  • o International Electrotechnical Commission
  • o International Commission on Radiation Units
  • o State
  • • Define the difference between and agreement state and non-agreement state.
  • • Evaluate the differences between Regulators’ mandates vs. recommendations.
  • • Define established guidelines for the principles of radiation safety of radioactive materials.
  • • Evaluate the process for acceptance testing and commissioning of linear accelerators and treatment planning systems.
  • • Define the role of a kernel within the beam modeling process of a treatment planning system.
  • • Compare and contrast commercial treatment planning system algorithms for dose calculation.

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Bellevue College
3000 Landerholm Circle SE Bellevue, WA 98007-6484 U.S.A.
Work: (425) 564-1000