Raphex Exam 1 Solution Manual Fully Solved Latest Update 2025 Graded A+
T1. the curie (Ci) is a unit of radioactivity based on the activity of 1 gram of _____. 1 Ci=37 ______ -
Answers E. Ra-226; GBq
T2. Bremsstrauhlung interactions result from electrons _________ - Answers B. inelastic collisions with
atomic nuclei
T3. an atomic mass unit (amu) is defined is ______ - Answers D. 1/12 of the mass of a 12Carbon6
T6. In the following, P is the parent isotope, and D is the daughter, A/Z P decays to A-4/Z-2D. This is an
example of ________ - Answers A. alpha decay
T7. a monoenergetic beam of 40keV photons interacts with a metal foil and produces photoelectrons of
20keV and 30keV. Prior to the interaction, what are the binding energies of these electrons? - Answers
A. 20keV and 10Kev
T9. complete the decay equations: 90/38Sr -> 90/39Y + _______ - Answers A. 0/-1 B+ antineutrino
T11. A broad spectrum kilovoltage xray beam has an intensity of I0. A 2mm Al sheet is placed in the
beam, and the intensity is reduced to one-half I0. an additional sheet of Al is added to the beam,
reducing the intensity to one-quarter I0. what is the thickness of the second sheet (in mm)? - Answers E.
>2
T15. electrons are produced in a linac's electron gun via the physical process known as _______ -
Answers A. thermionic emission
T17. why do linacs that deliver >10 MV require bending magnets, but lower- energy linacs do not? -
Answers A. the accelerating tube for >10MV linacs is too long.
T21. some MLCs are designed with rounded leaf ends to _______ - Answers C. maintain a relatively
constant geometric penumbra at different leaf positions
T23. list the linac head components in the order that the beam would pass by or through them: -
Answers B. metal target; flattening filter; monitor ion chamber; X and Y jaws
T24. in a Compton interaction, the scattered photon will be emitted with an angle relative to the
incident photon direction. the scatteref angle can range from _______ degrees. - Answers C. 0 to 180
T26. in Compton interaction the direction of the incoming photon defines 0 degrees. as the angle of the
scattered electron increases, its energy _____. as the angle of the scattered photon increases its energy
______. - Answers D. decreases; decreases
T27. given a material with a mass attenuation coefficient of 0.0329 cm^2/g and density of 1.2g/cm^3 ,
what thickness of the material is necessary to create a partial transmissions block delivering 85% of the
open field dose? - Answers C. 4cm
T1. the curie (Ci) is a unit of radioactivity based on the activity of 1 gram of _____. 1 Ci=37 ______ -
Answers E. Ra-226; GBq
T2. Bremsstrauhlung interactions result from electrons _________ - Answers B. inelastic collisions with
atomic nuclei
T3. an atomic mass unit (amu) is defined is ______ - Answers D. 1/12 of the mass of a 12Carbon6
T6. In the following, P is the parent isotope, and D is the daughter, A/Z P decays to A-4/Z-2D. This is an
example of ________ - Answers A. alpha decay
T7. a monoenergetic beam of 40keV photons interacts with a metal foil and produces photoelectrons of
20keV and 30keV. Prior to the interaction, what are the binding energies of these electrons? - Answers
A. 20keV and 10Kev
T9. complete the decay equations: 90/38Sr -> 90/39Y + _______ - Answers A. 0/-1 B+ antineutrino
T11. A broad spectrum kilovoltage xray beam has an intensity of I0. A 2mm Al sheet is placed in the
beam, and the intensity is reduced to one-half I0. an additional sheet of Al is added to the beam,
reducing the intensity to one-quarter I0. what is the thickness of the second sheet (in mm)? - Answers E.
>2
T15. electrons are produced in a linac's electron gun via the physical process known as _______ -
Answers A. thermionic emission
T17. why do linacs that deliver >10 MV require bending magnets, but lower- energy linacs do not? -
Answers A. the accelerating tube for >10MV linacs is too long.
T21. some MLCs are designed with rounded leaf ends to _______ - Answers C. maintain a relatively
constant geometric penumbra at different leaf positions
T23. list the linac head components in the order that the beam would pass by or through them: -
Answers B. metal target; flattening filter; monitor ion chamber; X and Y jaws
T24. in a Compton interaction, the scattered photon will be emitted with an angle relative to the
incident photon direction. the scatteref angle can range from _______ degrees. - Answers C. 0 to 180
T26. in Compton interaction the direction of the incoming photon defines 0 degrees. as the angle of the
scattered electron increases, its energy _____. as the angle of the scattered photon increases its energy
______. - Answers D. decreases; decreases
T27. given a material with a mass attenuation coefficient of 0.0329 cm^2/g and density of 1.2g/cm^3 ,
what thickness of the material is necessary to create a partial transmissions block delivering 85% of the
open field dose? - Answers C. 4cm
