Medical Physics Absorption Calculations
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Questions and Answers

What does the Lambert-Beer Law establish a linear relationship between?

  • Transmission and pathlength in the sample
  • Absorption and tissue density
  • Absorbance and concentration of an absorbing species (correct)
  • Reflection and light intensity
  • What does the absorption mean free path represent?

  • The average distance a photon travels before being absorbed (correct)
  • The absorption cross-sectional area of a material
  • The intensity of light entering a sample
  • The total pathlength of light through a medium
  • What does the absorption coefficient, µa, represent?

  • Absorption cross-sectional area per unit volume of medium (correct)
  • The concentration of Na molecules in the sample
  • The intensity of light leaving the sample
  • The linear relationship between transmission and absorption
  • In the context of absorption, what is meant by 'absorbing particles being identical'?

    <p>All particles absorb light with equal efficiency</p> Signup and view all the answers

    How is 'absorption' defined in the context of Medical Physics?

    <p>Absorption cross-sectional area per unit volume of medium</p> Signup and view all the answers

    What does the Absorption Assumptions state about the distribution of Na (molecules/cm3)?

    <p>Na molecules are uniformly distributed</p> Signup and view all the answers

    What is the primary mechanism that allows lasers to produce physical effects on tissue for treatment purposes?

    <p>Absorption of energy</p> Signup and view all the answers

    What happens when the photon frequency matches the frequency associated with a molecule's energy transition?

    <p>Absorption occurs</p> Signup and view all the answers

    Which of the following types of transitions emit photons corresponding to specific spectral lines?

    <p>All of the above</p> Signup and view all the answers

    What is the Beer-Lambert law used for?

    <p>Calculating the absorption of light in a medium</p> Signup and view all the answers

    Which of the following is a type of chromophore (light absorber) found in tissue?

    <p>All of the above</p> Signup and view all the answers

    What is the absorption coefficient related to?

    <p>The amount of light absorbed by a material</p> Signup and view all the answers

    What is the primary absorber in the UV-visible region of the electromagnetic spectrum in biological tissues?

    <p>Proteins and amino acids</p> Signup and view all the answers

    Which of the following is NOT a major absorption peak for water in the infrared region?

    <p>2.50 m</p> Signup and view all the answers

    What is the approximate absorption depth of light in the 6-7 m wavelength region in biological tissues?

    <p>10 m</p> Signup and view all the answers

    Which of the following is NOT a major absorption peak for proteins in the infrared region?

    <p>10 m</p> Signup and view all the answers

    What is the approximate absorption depth of light at $\lambda = 800$ nm in biological tissues?

    <p>500 mm</p> Signup and view all the answers

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