Radiation Physics Practice
Questions
Course Introduction
Radiation Physics explores the fundamental principles and applications of ionizing and non-ionizing radiation. The course covers the origins, properties, and interactions of various radiation types with matter, including alpha, beta, gamma, X-rays, and neutrons. Students will study radiation detection methods, measurement techniques, and instrumentation. Key topics include the biological effects of radiation, radiation safety and protection protocols, and the role of radiation in medical diagnostics and treatment, industry, and research settings. The course blends theoretical concepts with practical laboratory experience to provide a comprehensive understanding of radiation and its significance in science and technology.
Recommended Textbook
Essentials of Radiographic Physics and Imaging 2nd Edition by James Johnston
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16 Chapters
1530 Verified Questions
1530 Flashcards
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Chapter 1: Introduction to the Imaging Sciences
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76 Verified Questions
76 Flashcards
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Sample Questions
Q1) The radiologic unit that addresses the different biological effects of different types of ionizing radiation is the
A)rad
B)roentgen
C)sievert
D)gray
Answer: C
Q2) If 240 J of work is done in 1 minute,how much power is consumed?
A)4 J.
B)4 W.
C)4 kg-m/s.
D)4 m/s.
Answer: B
Q3) Meters per second squared (m/s²)is the unit of measure of A)velocity
B)momentum
C)force
D)acceleration
Answer: D
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Page 3
Chapter 2: Structure of the Atom
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63 Verified Questions
63 Flashcards
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Sample Questions
Q1) A negative ion is
A)an electron
B)an atom with more protons than electrons
C)an atom with more neutrons that electrons
D)an atom with more electrons than protons
Answer: D
Q2) In a neutral atom,the atomic number indicates the number of A)protons
B)neutrons
C)electrons
D)A and B
E)A and C
Answer: E
Q3) The three fundamental particles of the atom are the A)element,nucleus,and electron
B)electron,nucleus,and proton
C)neutron,electron,and proton
D)nucleus,proton,and neutron
Answer: C
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Page 4
Chapter 3: Electromagnetic and Particulate Radiation
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58 Verified Questions
58 Flashcards
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Sample Questions
Q1) When the alpha particle picks up two electrons as it passes through air it becomes a
A)neutral atom of hydrogen
B)radioactive atom of hydrogen
C)neutral atom of helium
D)radioactive atom of helium
Answer: C
Q2) In the formula E = hf,h represents
A)Planck's constant
B)frequency
C)energy
D)electricity
Answer: A
Q3) Electromagnetic theory was developed in the late 1800s by A)Bohr
B)Rutherford
C)Maxwell
D)Planck
Answer: C
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5
Chapter 4: The X-Ray Circuit
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152 Verified Questions
152 Flashcards
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Sample Questions
Q1) Electric charges are found only on the outside of a conductor.
A)True
B)False
Q2) During a radiographic procedure using AEC,the exposure time will be shorter when the spine covers the ionization chamber,as compared with air covering the chamber.
A)True
B)False
Q3) When a metallic conductor is colder:
A)resistance decreases
B)resistance increases
C)resistance remains the same
D)none of the above
Q4) A material that is strongly attracted to a magnetic field is
A)nonmagnetic
B)paramagnetic
C)ferromagnetic
D)diamagnetic
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Chapter 5: The X-Ray Tube
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110 Verified Questions
110 Flashcards
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Sample Questions
Q1) When the electrons strike the anode target,they all produce x-rays.
A)True
B)False
Q2) The induction motor turns the rotor of a specialty x-ray tube ___________ revolutions per minute.
A)1400
B)3400
C)6000
D)10,000
Q3) The advantage to using a larger actual focal spot is
A)the image is sharper
B)there is less wear and tear on the tube
C)the image is less sharp
D)higher exposures can be used
Q4) Which of the following practices extend tube life?
A)Press the prep and exposure switches at almost the same time.
B)Warm up the tube just before turning the equipment off.
C)Use high exposures.
D)None of the above.
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Chapter 6: X-Ray Production
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72 Verified Questions
72 Flashcards
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Sample Questions
Q1) With a 75-kVp exposure,the energy of the photons displayed on the continuous emission spectrum can range from just above 0 to
A)25 keV
B)50 keV
C)75 keV
D)150 keV
Q2) To double the beam quantity
A)halve the mAs
B)leave the mAs as is and reduce the kVp
C)double the mAs
D)increase the mAs by a factor of 4 (2²)
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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66 Verified Questions
66 Flashcards
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Sample Questions
Q1) The primary source of radiation exposure to the radiographer who is in the room during an exposure is
A)from scatter from the table
B)from scatter from the patient
C)from scatter from the image receptor
D)hard to determine;it depends on the procedure being done
Q2) Most classical scatter photons
A)are the result of the removal of an orbital electron
B)are absorbed in the body
C)are transmitted through the body
D)become remnant radiation
Q3) Irradiation of water can create harmful free radicals that then indirectly damage molecules and cells.
A)True
B)False
Q4) The more the energy of the incident x-ray photon exceeds the binding energy of the inner-shell electron,the greater the probability of a photoelectric interaction.
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) The device that receives the radiation after it exits the patient is the A)remnant beam
B)primary beam
C)image receptor
D)none of the above
Q2) Complete absorption of the diagnostic range x-ray photon is the interaction known as
A)Compton scattering
B)photoelectric interaction
C)classical scattering
D)photodisintegration
Q3) The latent image that is formed on the image receptor is the A)visible image
B)invisible image
C)A and B
D)none of the above
Q4) Production of a static or still image is associated with A)film-screen imaging
B)digital imaging
C)film-screen and digital imaging
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Chapter 9: Image Quality and Characteristics
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129 Verified Questions
129 Flashcards
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Sample Questions
Q1) A radiograph that is too light has ________________ to visualize the anatomic structures.
A)excessive brightness
B)excessive density
C)insufficient density
D)A and B
E)A and C
Q2) Density on the film-screen image is due to small deposits of ___________ in the processed film.
A)black metallic lead
B)bright metallic gold
C)black metallic silver
D)black metallic tungsten
Q3) The range of densities visible defines
A)density
B)high contrast
C)short-scale contrast
D)scale of contrast
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11
Chapter 10: Radiographic Exposure Technique
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135 Verified Questions
135 Flashcards
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Sample Questions
Q1) A radiograph of a part having different tissue types (such as bone and air)has lower contrast than that of a part with similar tissue types (such as liver and stomach).
A)True
B)False
Q2) Tube angulation may result in elongation and reduced exposure to the IR.
A)True
B)False
Q3) Assuming that all of these produce a similar amount of exit radiation,which of the following exposure factors minimize the radiation dose to the patient?
A)5 mAs @ 80 kVp.
B)10 mAs @ 70 kVp.
C)20 mAs @ 60 kVp.
D)None of the above.
Q4) Higher kVp results in less absorption and more variation in the intensities exiting the patient.
A)True
B)False
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Chapter 11: Scatter Control
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80 Verified Questions
80 Flashcards
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Sample Questions
Q1) Grid cutoff results in
A)reduced exposure to the IR
B)a light film-screen image
C)possible quantum mottle
D)all of the above
Q2) The only grid cutoff error that can occur with a parallel grid is
A)upside-down focused
B)off-level
C)off-center
D)off-focus
Q3) The higher the grid ratio,the _____________ the scatter clean up and the _____________________ the radiographic contrast.
A)better;higher
B)worse;lower
C)better;lower
D)worse;higher
Q4) To overcome the decrease in sharpness caused by the air gap technique,an increase in SID is required.
A)True
B)False
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Chapter 12: Image Receptors
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176 Verified Questions
176 Flashcards
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Sample Questions
Q1) The latent image center is
A)several sensitivity specks with silver ions attached
B)what will become metallic silver after chemical processing
C)what will become radiographic density after chemical processing
D)All of the above
Q2) Following the detection of the light released from the phosphor layer,the amplified signal is sent to the _____________ to convert it to a digital electronic signal for the display computer
A)digital-to-analog converter (DAC)
B)analog-to-digital converter (ADC)
C)light-to-computer device (LTC)
D)none of the above
Q3) As the speed class of a DR system decreases,the image noise _______________ and the patient exposure ________________
A)increases;increases
B)increases;decreases
C)decreases;increases
D)decreases;decreases
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Chapter 13: Exposure Technique Selection
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63 Verified Questions
63 Flashcards
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Sample Questions
Q1) Using the plus or minus density controls should be done frequently to produce optimal images with AEC.
A)True
B)False
Q2) When there is a significant amount of scatter radiation reaching the detector,the exposure time will
A)be shorter than needed
B)be appropriate
C)be longer than needed
Q3) With digital imaging using AEC,if an AP thoracic spine is imaged with the density setting changed from 0 to -2,the brightness in the area of interest is __________________ and the ____________ is increased.(Assume all other factors are appropriate. )
A)decreased;exposure time
B)increased;image contrast
C)appropriate;recorded detail
D)appropriate;quantum noise
Q4) Collimation is not required when AEC is used.
A)True
B)False
Page 15
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Chapter 14: Image Intensified Fluoroscopy
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95 Verified Questions
95 Flashcards
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Sample Questions
Q1) The ABC can be slow in responding,seen as a brief delay in the brightness adjustment.
A)True
B)False
Q2) Typical fluoroscopic systems have spatial resolution capabilities in the range of
A)2-3 Lp/mm
B)4-6 Lp/mm
C)7-9 Lp/mm
D)10-12 Lp/mm
Q3) The term that means using an image intensifier to create a brighter image by taking a few x-ray photons and converting that energy into many light photons is the
A)brightness gain
B)flux gain
C)minification gain
D)conversion factor
Q4) The purpose of a camera tube or CCD is to record the fluoroscopic image.
A)True
B)False
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Chapter 15: Additional Equipment
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53 Flashcards
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Sample Questions
Q1) Increasing the tomographic angle _____ the thickness of the focal plane.
A)increases
B)decreases
C)does not affect
Q2) The battery-powered mobile radiographic unit produces consistent radiation output,similar to a single-phase generator.
A)True
B)False
Q3) The goal of linear tomography is to
A)sharpen the anatomic structures above and below the level of interest
B)sharpen the anatomic structures within the level of interest
C)blur the anatomic structures above and below the level of interest
D)blur the anatomic structures within the level of interest
Q4) The film-screen image receptor used in mammography has
A)a double-emulsion film and two intensifying screens
B)a double-emulsion film and one intensifying screen
C)a single-emulsion film and one intensifying screen
D)a single-emulsion film and two intensifying screens
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Page 17
Chapter 16: Computed Tomography
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136 Verified Questions
136 Flashcards
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Sample Questions
Q1) The CT number of water is
A)0
B)greater than 0
C)less than 0
D)unable to determine unless more is known
Q2) Each major development in beam and detector geometry is called a
A)generation
B)gantry
C)detector
D)upgrade
Q3) To focus on dose optimization,it is important to balance reductions in patient dose with
A)maintaining examination cost
B)maintaining image quality
C)increasing scan time
D)All of the above
Q4) The major development for the first three generations of CT scanners was the reduction in patient exposure.
A)True
B)False
Page 18
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