Radiation Physics
Mock Exam
Course Introduction
Radiation Physics is a foundational course that explores the physical principles, properties, and interactions of ionizing and non-ionizing radiation with matter. The course covers topics such as the nature and types of radiation, radioactive decay, radiation sources, detection and measurement of radiation, as well as the biological effects and safety considerations associated with radiation exposure. Through both theoretical concepts and practical applications, students gain an understanding of radiations role in science, medicine, industry, and environmental studies, preparing them for advanced topics in medical physics, nuclear engineering, and radiological protection.
Recommended Textbook
Essentials of Radiographic Physics and Imaging 1st Edition by James Johnston
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16 Chapters
1558 Verified Questions
1558 Flashcards
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Page 2
Chapter 1: Introduction to the Imaging Sciences
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75 Verified Questions
75 Flashcards
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Sample Questions
Q1) What is the momentum of the 20 kg box that is traveling 10 m/s?
A) 200 m/s<sup>2</sup>
B) 200 W
C) 200 kg-m/s
D) 200 J
Answer: C
Q2) Energy in a stored state is:
A) kinetic energy
B) energy of motion
C) potential energy
D) power
Answer: C
Q3) Lead shutters are part of the:
A) tube housing
B) tube stand
C) collimator
D) x-ray tube
Answer: C
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Chapter 2: Structure of the Atom
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63 Verified Questions
63 Flashcards
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Sample Questions
Q1) The "plum pudding model" is associated with:
A) Bohr
B) Rutherford
C) Dalton
D) Thomson Answer: D
Q2) The outermost shell of an atom can hold fewer than 8 electrons.
A)True
B)False
Answer: True
Q3) Each element has an unchanging number of protons.
A)True
B)False Answer: True
Q4) If an atom has 15 electrons,which will be the outermost shell?
A) "L"
B) "M"
C) "N"
D) "O"
Answer: B
Page 4
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Chapter 3: Electromagnetic and Particulate Radiation
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58 Verified Questions
58 Flashcards
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Sample Questions
Q1) What is the frequency of electromagnetic radiation if the wavelength is 1 × 10 m?
A) 3 × 10-12 Hz
B) 3 × 10-4 Hz
C) 3 × 104 Hz
D) 3 × 1012 Hz
Answer: D
Q2) Wavelength is generally measured in:
A) hertz
B) feet
C) centimeters
D) meters
Answer: D
Q3) The general process of a radioactive element giving off excess energy and particles to regain stability is:
A) radioactivity
B) radioactive decay
C) ionization
D) electron emission
Answer: B
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Page 5
Chapter 4: X-Ray Circuit
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147 Verified Questions
147 Flashcards
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Sample Questions
Q1) If a conductor is curved,the greatest amount of charge will be found:
A) at the beginning of the conductor
B) at the end of the conductor
C) at the area of the greatest curvature of the conductor
D) along the straightest area of the conductor
Q2) Ohm's Law can be written as:
A) amps = volts × ohms
B) volts = amps × ohms
C) ohms = volts × amps
D) none of the above
Q3) A capacitor and rheostat are used in electronic timers.
A)True
B)False
Q4) When a negative charge is placed on the p-type crystal and a positive charge on the n-type crystal,the result is:
A) current flows through the diode
B) current does not flow through the diode
C) voltage decreases
D) voltage increases
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Chapter 5: The X-Ray Tube
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108 Flashcards
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Sample Questions
Q1) X-ray tubes with a stationary anode design may be found today:
A) in small x-ray departments
B) in small x-ray tubes
C) in medical areas that only need small x-ray exposures
D) in medical areas that only image the head and teeth
Q2) The most common x-ray tube target angle is:
A) 2 degrees
B) 8 degrees
C) 12 degrees
D) 18 degrees
Q3) Which of the following occurs first during x-ray production?
A) thermionic emission
B) voltage is transformed to kilovoltage
C) current passes through the rheostat
D) kilovoltage is applied to anode and cathode
Q4) The anode includes the:
A) target
B) induction motor
C) envelope
D) A and B
Page 7
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Chapter 6: X-Ray Production
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68 Verified Questions
68 Flashcards
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Sample Questions
Q1) With the x-ray emission spectrum,the discrete line is the highest energy ___________________ bar.
A) J-characteristic
B) K-characteristic
C) L-characteristic
D) M-characteristic
Q2) It is recommended that kVp not be used to control beam quantity because:
A) it affects scatter production
B) it affects penetrability of the beam
C) it is less predictable in how changing the kVp affects the image
D) all of the above
Q3) The total number of x-ray photons in a beam is referred to as the:
A) x-ray quality
B) x-ray number
C) x-ray quantity
D) x-ray beam
Q4) A 65-keV filament electron is not able to produce characteristic radiation.
A)True
B)False
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Chapter 7: X-Ray Interactions With Matter
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63 Flashcards
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Sample Questions
Q1) The probability of a photoelectric interaction depends on the energy level of the incident x-ray photon.
A)True
B)False
Q2) The greater the angle of deflection of a Compton scatter photon:
A) the more likely it will interact with the image receptor
B) the lower the energy of the photon
C) the higher the energy of the photon
D) the more likely it will become part of the remnant radiation
Q3) Compton scattering involves the x-ray photon:
A) being absorbed in the atom
B) removing an inner-shell electron
C) removing a middle- or outer-shell electron
D) passing through the atom without any change
Q4) The probability of a photoelectric interaction depends on the atomic number of the atom.
A)True
B)False
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Chapter 8: Image Production
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66 Verified Questions
66 Flashcards
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Sample Questions
Q1) Increasing the thickness of the part being imaged results in:
A) increased attenuation
B) decreased attenuation
C) no change in attenuation
Q2) At higher kilovoltages within the diagnostic range:
A) the percentage of photoelectric interactions increase
B) the percentage of photoelectric interactions decrease
C) the percentage of photoelectric interactions remains the same
D) none of the above
Q3) Coherent scattering:
A) is a significant interaction during radiographic imaging
B) has minimal effect on the imaging process
C) never affects the diagnostic image
D) none of the above
Q4) The probability of a Compton interaction is _______________ in bone than soft tissue.
A) less
B) the same
C) higher
D) none of the above
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Chapter 9: Image Characteristics
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161 Verified Questions
161 Flashcards
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Sample Questions
Q1) The smallest component of the digital image matrix is the:
A) matrix
B) FOV
C) pixel
D) bit depth
Q2) When two images are compared and film 1 has 1.3 OD and film 2 has 1.6 OD:
A) film 2 is 30% lighter than film 1
B) film 2 is 30% darker than film 1
C) film 2 is two times lighter than film 1
D) film 2 is two times darker than film 1
Q3) An area of anatomy that has low subject contrast is the:
A) chest
B) breast
C) elbow
D) knee
Q4) It is impossible to produce a radiographic image without unsharpness.
A)True
B)False
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Chapter 10: Radiographic Exposure Technique
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163 Verified Questions
163 Flashcards
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Sample Questions
Q1) With film-screen imaging,changing from 60 kVp to 69 kVp results in an image:
A) with twice the optical density
B) with four times the optical density
C) with 15% more optical density
D) with 50% more optical density
Q2) Generally,if a film image is dark the mAs should be:
A) halved
B) kept the same;adjust something else
C) doubled
D) none of the above
Q3) Increasing collimation means decreasing the x-ray field size.
A)True
B)False
Q4) If the original exposure factors are 20 mAs @ 70 kVp,which of the following factors produce a film image with the same density but higher contrast?
A) 10 mAs @ 80 kVp
B) 10 mAs @ 70 kVp
C) 40 mAs @ 70 kVp
D) 40 mAs @60 kVp
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Chapter 11: Scatter Control
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80 Verified Questions
80 Flashcards
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Sample Questions
Q1) The recommended SIDs that can be used with a focused grid is the:
A) convergent line
B) focal distance
C) convergent point
D) focal range
Q2) An IR that has a grid permanently attached to its front surface is a:
A) wafer grid
B) bucky
C) grid cap
D) grid cassette
Q3) The automatic collimator:
A) automatically collimates to the anatomy of interest
B) is required by law on all new equipment
C) is seldom found on modern x-ray equipment
D) automatically collimates to the IR size
Q4) The probability of a Compton interaction occurring is related to:
A) the energy of the x-ray photon
B) the atomic number of the matter
C) the mAs used
D) all of the above
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Chapter 12: Image Receptors
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167 Flashcards
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Sample Questions
Q1) The front of the film-screen cassette should be made of lead foil so that the transmitted radiation is absorbed before reaching the film.
A)True
B)False
Q2) Undesirable fluctuations in the brightness of an image is:
A) contrast
B) noise
C) DQE
D) DAP
Q3) If the replenishment process fails,not allowing fresh solution to be added to the developer solution,the radiographs appear:
A) dark
B) light
C) clear
D) black
Q4) The DAP is used for cassette-less digital systems and is a measure of the dose to the patient.
A)True
B)False
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Chapter 13: Automatic Exposure Control
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60 Flashcards
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Sample Questions
Q1) Testing to make sure the AEC system produces the same results for multiple identical exposures is checking for ______________ and the optical densities should be within +/- ______________.
A) reproducibility;0.1
B) calibration;2
C) consistency;0.2
D) none of the above
Q2) If the radiographer is doing an upright chest using AEC but the table bucky is selected:
A) the back-up time will be reached
B) the patient will be exposed to excessive radiation
C) the IR will be overexposed
D) all of the above
Q3) It is safe to assume that APR settings have been developed to produce the best quality images with the least amount of exposure.
A)True
B)False
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15
Chapter 14: Image Intensified Fluoroscopy
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100 Verified Questions
100 Flashcards
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Sample Questions
Q1) The _____________________is located very close to the output phosphor.
A) input phosphor
B) output phosphor
C) photocathode
D) accelerating anode
Q2) The image intensifier is located:
A) next to the x-ray tube used for fluoroscopy
B) beneath the x-ray table
C) on a shelf just inside the room
D) inside the fluoro tower
Q3) This part of the image intensifier absorbs light and produces electrons.
A) input phosphor
B) output phosphor
C) photocathode
D) electrostatic focusing lenses
Q4) This part of the image intensifier is made of cesium iodide.
A) input phosphor
B) output phosphor
C) photocathode
D) accelerating anode
Page 16
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Chapter 15: Additional Equipment
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54 Flashcards
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Sample Questions
Q1) The fixed point that is placed at the level of the anatomic structures to be imaged during tomography is the:
A) tomographic amplitude
B) exposure amplitude
C) fulcrum
D) focal plane
Q2) DXA uses an x-ray tube and a(n):
A) scintillation detector
B) film-screen image receptor
C) image intensifier
D) none of the above
Q3) This type of radiographic unit is very lightweight and produces a consistent radiation output.
A) battery-powered mobile unit
B) capacitor discharge mobile unit
C) direct-power mobile unit
D) high-frequency mobile unit
Q4) A dedicated unit is one that is designed for specific imaging procedures.
A)True
B)False
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Chapter 16: Computed Tomography
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125 Verified Questions
125 Flashcards
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Sample Questions
Q1) CT examinations currently account for approximately ________ of the U.S.population's radiation exposure resulting from medical procedures.
A) 10%
B) 25%
C) 50%
D) 75%
Q2) The midpoint of the range of CT numbers to be displayed in the image is the:
A) window level
B) window height
C) window width
D) window clearance
Q3) A pitch of 1 indicates that with each rotation of the tube:
A) the table is moving farther than the slice thickness
B) the table is moving less than the slice thickness
C) the table is moving the same distance as the slice thickness
D) none of the above
Q4) The scintillation-type detector is commonly used in today's CT scanner.
A)True
B)False
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