Jul 23, 2024  
2023-24 Catalog 
2023-24 Catalog [ARCHIVED CATALOG]

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DOSM 315 - Physics for Medical Dosimetry I

5 CR

Explores the fundamentals of radiation therapy physics and safety with special attention to nuclear transformations and decay, x-ray production, radiation generators, interactions of ionizing radiation, x-ray beam quality, measurement of absorbed dose, dose distribution and scatter analysis.

Prerequisite(s): Acceptance into the program.

Course Outcomes
  • Calculate the decay constant, mean and half-life of a radioactive source.
  • Identify internal structure of an x-ray tube and identify the two different mechanisms by which x-rays are produced.
  • Identify key components and differential mechanisms between current linear accelerator technology and historical delivery units.
  • Define the difference between transmission and geometric penumbra and be able to calculate geometric penumbra.
  • Define the terms attenuation and linear attenuation coefficients and apply these terms to Half and Tenth Value Layers. Discuss the limitations to HVL alone as a measure of beam quality in superficial and orthovoltage range units. Calculate the HVL for a radiation beam.
  • Discuss the differences between coherent scattering, photoelectric effect, Compton effect, pair production and annihilation radiation and their associated energy ranges. 
  • Calculate the incident photon energy, scattered photon energy or scattered electron energy for Compton interaction.
  • Describe the dependence of various interactions on atomic number.
  • Calculate equivalent attenuation using electron density across multiple mediums.
  • Define the stem effect and the two root causes for this effect.
  • Define the unit of measurement, the Roentgen, its relationship to electronic equilibrium within a free-air ionization chamber and calculate the exposure in Roentgens for a field of radiation.
  • Define the relationship between kerma, exposure and absorbed dose.
  • Calculate dose to any medium using the f-factor and define the change in the f-factor as function of energy.
  • Analyze the TG-21 and TG-51 recommendations for absorbed dose measurements and calibration.
  • Identify Radiation Safety Protocols for storage and transportation of radioactive sources, Shielding Design, Regulations and Radiation Safety Committees.
  • Calculate the temperature and pressure correction for exposure measurement.
  • Calculate the dose to a prescribed depth using Percentage Depth Dose (PDD) charts. Define the relationship between the TAR and PDD for a given beam. Calculate the Tissue-Air Ratio (TAR) for a given clinical field size and depth. Define the relationship between the Backscatter Factor and TAR.
  • Calculate the equivalent square for an irregular field size, Scatter-Air Ratio using TAR data and define Clarkson Method.

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