RIDQC STUDENT MANUAL NEWLY UPDATED COLLECTION OF EXAM
QUESTIONS AND VERIFIED ANSWERS DESIGNED TO GUARANTEE
YOUR SUCCESS ON THE LATEST TEST VERSION
Q1: What is radiation? ANSWER Radiation is energy that travels through
space or matter in the form of waves or particles.
Q2: What are the two main types of radiation? ANSWER Ionizing radiation
and non-ionizing radiation.
Q3: What is ionizing radiation? ANSWER Radiation that has enough energy
to remove electrons from atoms, creating ions.
Q4: What is the primary source of X-rays in radiography? ANSWER X-
ray tubes that accelerate electrons to strike a metal target (anode).
Q5: What is electromagnetic radiation? ANSWER Energy that travels as
waves at the speed of light, including X-rays, gamma rays, visible light, and
radio waves.
Q6: What is wavelength? ANSWER The distance between two consecutive
peaks or troughs in a wave.
Q7: What is frequency? ANSWER The number of wave cycles that pass a
given point per unit of time, measured in Hertz (Hz).
Q8: How are wavelength and frequency related? ANSWER They are
inversely related; as wavelength increases, frequency decreases, and vice versa.
Q9: What is photon energy measured in? ANSWER Electron volts (eV) or
kilo-electron volts (keV).
Q10: What is the relationship between photon energy and wavelength?
ANSWER Photon energy is inversely proportional to wavelength; shorter
wavelengths have higher energy.
Q11: What is the speed of electromagnetic radiation? ANSWER
Approximately 3 × 10⁸ meters per second (speed of light in a vacuum).
,Q12: What is an atom? ANSWER The smallest unit of matter that retains the
properties of an element, consisting of protons, neutrons, and electrons.
Q13: What is atomic number (Z)? ANSWER The number of protons in the
nucleus of an atom.
Q14: What is mass number (A)? ANSWER The total number of protons and
neutrons in an atom's nucleus.
Q15: What are isotopes? ANSWER Atoms of the same element with different
numbers of neutrons.
Q16: What is ionization? ANSWER The process of removing electrons from
atoms, creating positively charged ions.
Q17: What is excitation? ANSWER The process of raising an electron to a
higher energy level without removing it from the atom.
Q18: What are the two types of X-rays produced in an X-ray tube?
ANSWER Bremsstrahlung (braking) radiation and characteristic radiation.
Q19: What is Bremsstrahlung radiation? ANSWER X-rays produced when
high-speed electrons are slowed down or stopped by the target material.
Q20: What is characteristic radiation? ANSWER X-rays produced when an
electron fills a vacancy in an inner electron shell of the target atom.
Q21: What is the primary target material in most X-ray tubes? ANSWER
Tungsten.
Q22: Why is tungsten used as a target material? ANSWER It has a high
atomic number (74), high melting point (3,370°C), and good thermal
conductivity.
Q23: What is kVp? ANSWER Kilovoltage peak; the maximum voltage
applied across the X-ray tube, which determines the energy of X-ray photons.
Q24: What is mA? ANSWER Milliamperage; the measure of tube current,
which determines the quantity of X-rays produced.
Q25: What is mAs? ANSWER Milliampere-seconds; the product of tube
current (mA) and exposure time (s), representing the total quantity of X-rays.
Q26: How does increasing kVp affect X-ray production? ANSWER It
increases both the energy (quality) and quantity of X-rays produced.
Q27: How does increasing mAs affect X-ray production? ANSWER It
increases only the quantity of X-rays, not their energy.
, Q28: What is the 15% rule in radiography? ANSWER Increasing kVp by
15% has approximately the same effect on image density as doubling the mAs.
Q29: What is half-value layer (HVL)? ANSWER The thickness of material
required to reduce the X-ray beam intensity to half its original value.
Q30: What is beam filtration? ANSWER The use of materials (usually
aluminum) to remove low-energy X-rays from the beam.
Q31: Why is filtration important? ANSWER It reduces patient dose by
removing low-energy X-rays that would be absorbed by the patient without
contributing to image formation.
Q32: What is inherent filtration? ANSWER Filtration provided by the X-ray
tube components such as the glass envelope and tube oil.
Q33: What is added filtration? ANSWER Additional aluminum filters placed
in the beam path to increase total filtration.
Q34: What is the minimum total filtration required for radiographic
equipment? ANSWER Generally 2.5 mm aluminum equivalent for equipment
operating above 70 kVp.
Q35: What is collimation? ANSWER The restriction of the X-ray beam to the
area of clinical interest.
Q36: What is the inverse square law? ANSWER The intensity of radiation is
inversely proportional to the square of the distance from the source.
Q37: If the distance from the X-ray source is doubled, what happens to the
intensity? ANSWER The intensity decreases to one-fourth (25%) of the
original intensity.
Q38: What is source-to-image distance (SID)? ANSWER The distance from
the X-ray tube focal spot to the image receptor.
Q39: What is the standard SID for most radiographic procedures?
ANSWER 40 inches (100 cm) or 72 inches (180 cm) for chest radiography.
Q40: What is attenuation? ANSWER The reduction in X-ray beam intensity
as it passes through matter.
Section 2: X-ray Interactions with Matter (Questions 41-70)
Q41: What are the five types of X-ray interactions with matter? ANSWER
Coherent scattering, photoelectric effect, Compton scattering, pair production,
and photodisintegration.
QUESTIONS AND VERIFIED ANSWERS DESIGNED TO GUARANTEE
YOUR SUCCESS ON THE LATEST TEST VERSION
Q1: What is radiation? ANSWER Radiation is energy that travels through
space or matter in the form of waves or particles.
Q2: What are the two main types of radiation? ANSWER Ionizing radiation
and non-ionizing radiation.
Q3: What is ionizing radiation? ANSWER Radiation that has enough energy
to remove electrons from atoms, creating ions.
Q4: What is the primary source of X-rays in radiography? ANSWER X-
ray tubes that accelerate electrons to strike a metal target (anode).
Q5: What is electromagnetic radiation? ANSWER Energy that travels as
waves at the speed of light, including X-rays, gamma rays, visible light, and
radio waves.
Q6: What is wavelength? ANSWER The distance between two consecutive
peaks or troughs in a wave.
Q7: What is frequency? ANSWER The number of wave cycles that pass a
given point per unit of time, measured in Hertz (Hz).
Q8: How are wavelength and frequency related? ANSWER They are
inversely related; as wavelength increases, frequency decreases, and vice versa.
Q9: What is photon energy measured in? ANSWER Electron volts (eV) or
kilo-electron volts (keV).
Q10: What is the relationship between photon energy and wavelength?
ANSWER Photon energy is inversely proportional to wavelength; shorter
wavelengths have higher energy.
Q11: What is the speed of electromagnetic radiation? ANSWER
Approximately 3 × 10⁸ meters per second (speed of light in a vacuum).
,Q12: What is an atom? ANSWER The smallest unit of matter that retains the
properties of an element, consisting of protons, neutrons, and electrons.
Q13: What is atomic number (Z)? ANSWER The number of protons in the
nucleus of an atom.
Q14: What is mass number (A)? ANSWER The total number of protons and
neutrons in an atom's nucleus.
Q15: What are isotopes? ANSWER Atoms of the same element with different
numbers of neutrons.
Q16: What is ionization? ANSWER The process of removing electrons from
atoms, creating positively charged ions.
Q17: What is excitation? ANSWER The process of raising an electron to a
higher energy level without removing it from the atom.
Q18: What are the two types of X-rays produced in an X-ray tube?
ANSWER Bremsstrahlung (braking) radiation and characteristic radiation.
Q19: What is Bremsstrahlung radiation? ANSWER X-rays produced when
high-speed electrons are slowed down or stopped by the target material.
Q20: What is characteristic radiation? ANSWER X-rays produced when an
electron fills a vacancy in an inner electron shell of the target atom.
Q21: What is the primary target material in most X-ray tubes? ANSWER
Tungsten.
Q22: Why is tungsten used as a target material? ANSWER It has a high
atomic number (74), high melting point (3,370°C), and good thermal
conductivity.
Q23: What is kVp? ANSWER Kilovoltage peak; the maximum voltage
applied across the X-ray tube, which determines the energy of X-ray photons.
Q24: What is mA? ANSWER Milliamperage; the measure of tube current,
which determines the quantity of X-rays produced.
Q25: What is mAs? ANSWER Milliampere-seconds; the product of tube
current (mA) and exposure time (s), representing the total quantity of X-rays.
Q26: How does increasing kVp affect X-ray production? ANSWER It
increases both the energy (quality) and quantity of X-rays produced.
Q27: How does increasing mAs affect X-ray production? ANSWER It
increases only the quantity of X-rays, not their energy.
, Q28: What is the 15% rule in radiography? ANSWER Increasing kVp by
15% has approximately the same effect on image density as doubling the mAs.
Q29: What is half-value layer (HVL)? ANSWER The thickness of material
required to reduce the X-ray beam intensity to half its original value.
Q30: What is beam filtration? ANSWER The use of materials (usually
aluminum) to remove low-energy X-rays from the beam.
Q31: Why is filtration important? ANSWER It reduces patient dose by
removing low-energy X-rays that would be absorbed by the patient without
contributing to image formation.
Q32: What is inherent filtration? ANSWER Filtration provided by the X-ray
tube components such as the glass envelope and tube oil.
Q33: What is added filtration? ANSWER Additional aluminum filters placed
in the beam path to increase total filtration.
Q34: What is the minimum total filtration required for radiographic
equipment? ANSWER Generally 2.5 mm aluminum equivalent for equipment
operating above 70 kVp.
Q35: What is collimation? ANSWER The restriction of the X-ray beam to the
area of clinical interest.
Q36: What is the inverse square law? ANSWER The intensity of radiation is
inversely proportional to the square of the distance from the source.
Q37: If the distance from the X-ray source is doubled, what happens to the
intensity? ANSWER The intensity decreases to one-fourth (25%) of the
original intensity.
Q38: What is source-to-image distance (SID)? ANSWER The distance from
the X-ray tube focal spot to the image receptor.
Q39: What is the standard SID for most radiographic procedures?
ANSWER 40 inches (100 cm) or 72 inches (180 cm) for chest radiography.
Q40: What is attenuation? ANSWER The reduction in X-ray beam intensity
as it passes through matter.
Section 2: X-ray Interactions with Matter (Questions 41-70)
Q41: What are the five types of X-ray interactions with matter? ANSWER
Coherent scattering, photoelectric effect, Compton scattering, pair production,
and photodisintegration.
