MDCB Review
Compton Scattering results in the ejection of an electron and....
A: A scattered Photon with a longer wavelength than the incident Photon
B: A scattered Photon with a shorter wavelength than the incident Photon
C: A scattered Photon with the same wavelength as an incident Photon
D: An equal sharing of the Photon energy by the electron and recoil nucleus
E: None of the above - answerA: A scattered Photon with a longer wavelength than the
incident Photon
Which is not true about pair production?
A: The threshold energy is 1.02 MeV
B: An electron and positron are created
C: An example of energy mass conversion
D: Two photons are created
E: None of the above - answerD: Two photons are created
Which of these statements is not true about positrons?
A: They annihilate when combined with electrons
B: They result from a pair production interaction
C: Their properties are identical to electrons except for their charge
D: After annihilation two 510 keV
E: None of the above - answerD: After annihilation two 510 keV
When tissue is oxygenated:
A: A higher dose is required for a given effect
B: DNA becomes radiation resistant
C: Cell death is less likely
D: More free radicals are formed - answerD: More free radicals are formed
The unit of absorbed dose is the:
A: Rem/sievert
B: Rad/gray
C: roentgen
D: curie/becquerel - answerB: Rad/gray
The accumulated dose limit (DL) for a technologist who is 26 years old is:
A: 16 mSv
B: 400 mSv
C: 260 mSv
D: 80 mSv - answerC: 260 mSv
Age x 10
Board only looks for sieverts
,Which of the following units is used when expressing Ionization in air?
A: Rad
B: roentgen
C: sievert
D: gray
E: becquerel - answerB: roentgen
Alpha particles are:
A: Composed of two protons and two neutrons
B: Are equivalent to a helium nuclei
C: Have a high linear energy transfer
D: All of the above - answerD: All of the above
The average energy deposited per unit path length to a medium by ionizing radiation as
it passes through that medium best describes:
A: Linear energy transfer (LET)
B: Radiation absorbed dose (Rad)
C: Radiation equivalent man (Rem)
D: Tissue absorbed dose (TAR) - answerA: linear energy transfer (LET)
Should you increase your distance from the source to three times the original, your
exposure would become:
A: 9 Times the original
B: 2 times the original
C: 1/9 the original
D: 1/2 the original - answerC: 1/9 the original
This device is used for detection rather than measurement of radiation sources and low
level radioactive contamination.
A: Geiger Muller
B: Scintillation counter
C: TLD badge
D: PIC (pocket Ionization chamber) - answerA: Geiger Muller
Which of the following may fog due to humidity and temperature changes yet is easy to
process and provides a permanent record of exposure?
A: Geiger Muller
B: Scintillation counter
C: TLD badge
D: PIC (pocket Ionization chamber)
E: Film badge - answerE: Film badge
Which of the following are a benefit of TLD over film badges?
1: can be read many times
2: More accurate
,3: Not affected by temperature and pressure
4: Can be worn for longer periods of time
A: 1,3,4
B: 1,2,4
C: 2,3,4
D: 1,2,3 - answerC: 2,3,4
More accurate, not affected by temperature and pressure and can be worn for longer
periods of time
According to the current NCRP recommendations, the guidance level for cumulative
exposure for a 28-year-old occupational worker with three years of experience is:
A: 8 Rem (80 mSv)
B: 28 Rem (280 mSv)
C: 35 Rem (350 mSv)
D: 47 Rem (470 mSv) - answerB: 28 Rem (280 mSv)
Which is not a personnel monitoring device?
A: TLD
B: Film dosimeter
C: Cutie pie
D: Pocket Ionization chamber - answerC: Cutie pie
What is the recommended total dose limit to a fetus?
A: .5 Rem/yr
B: .5 Rem/gestational period
C: .05 Rem/yr
D: .1 Rem/yr - answerB: .5 Rem/gestational period
The limit for a controlled area is:
A: 10 mR/week
B: 100 mR/week
C: 20 mR/hr
D: 10 mR/hr - answerB: 100 mR/week
Audible and visual contact with the patients:
A: May be used only if it is a child
B: Is mandatory for every treatment
C: Doesn't apply to radiation therapy
D: Is optional - answerB: Is mandatory for every treatment
The NRC requires _____ checks and full calibration _____ for a cobalt 60 unit.
A: daily/weekly
B: Weekly/monthly
C: monthly/yearly
D: Weekly/yearly - answerC: monthly/yearly
, In radiation protection, the term controlled area refers to any:
A: Shielded area
B: Area that is occupied by radiation workers
C: Area that has a radiation detector
D: Area that is under the supervision of a radiation safety supervisor - answerD: Area
that is under the supervision of a radiation safety supervisor
A radiation high energy room shall have emergency off buttons installed ________.
A: In the treatment room
B: On the control Console
C: Both of the above
D: None of the above - answerC: Both of the above
In the treatment room and on the control console
A sign " caution radiation this equipment produces radiation when energized" must be
placed in the:
1: Control Console
2: Treatment head
3: Treatment table
A: 1 only
B: 2 only
C: 1,3
D: 1,2,3 - answerA: 1 only
Control Consol
The principal objective in performing field symmetry and flatness checks is the
determination of:
A: Dose rate consistency across the field
B: Dose rate consistency at the central axis
C: Film density across the field
D: Attenuation at the central axis - answerA: Dose rate consistency across the field
The proper sequence of materials traveled by an electron therapy mode of linear
accelerator is:
1: Ion chamber
2: Scattering foil
3: X-ray Collimator
A: 1,2,3 (Ion chamber, scattering foil, x-ray Collimator)
B: 2,1,3 (scattering foil, ion chamber, x-ray Collimator)
C: 3,2,1 (x-ray Collimator, Scattering foil, ion chamber)
D: 3,1,2 (x-ray Collimator, ion chamber, scattering foil) - answerB: 2,1,3
Scattering foil, ion chamber, x-ray Collimator
Compton Scattering results in the ejection of an electron and....
A: A scattered Photon with a longer wavelength than the incident Photon
B: A scattered Photon with a shorter wavelength than the incident Photon
C: A scattered Photon with the same wavelength as an incident Photon
D: An equal sharing of the Photon energy by the electron and recoil nucleus
E: None of the above - answerA: A scattered Photon with a longer wavelength than the
incident Photon
Which is not true about pair production?
A: The threshold energy is 1.02 MeV
B: An electron and positron are created
C: An example of energy mass conversion
D: Two photons are created
E: None of the above - answerD: Two photons are created
Which of these statements is not true about positrons?
A: They annihilate when combined with electrons
B: They result from a pair production interaction
C: Their properties are identical to electrons except for their charge
D: After annihilation two 510 keV
E: None of the above - answerD: After annihilation two 510 keV
When tissue is oxygenated:
A: A higher dose is required for a given effect
B: DNA becomes radiation resistant
C: Cell death is less likely
D: More free radicals are formed - answerD: More free radicals are formed
The unit of absorbed dose is the:
A: Rem/sievert
B: Rad/gray
C: roentgen
D: curie/becquerel - answerB: Rad/gray
The accumulated dose limit (DL) for a technologist who is 26 years old is:
A: 16 mSv
B: 400 mSv
C: 260 mSv
D: 80 mSv - answerC: 260 mSv
Age x 10
Board only looks for sieverts
,Which of the following units is used when expressing Ionization in air?
A: Rad
B: roentgen
C: sievert
D: gray
E: becquerel - answerB: roentgen
Alpha particles are:
A: Composed of two protons and two neutrons
B: Are equivalent to a helium nuclei
C: Have a high linear energy transfer
D: All of the above - answerD: All of the above
The average energy deposited per unit path length to a medium by ionizing radiation as
it passes through that medium best describes:
A: Linear energy transfer (LET)
B: Radiation absorbed dose (Rad)
C: Radiation equivalent man (Rem)
D: Tissue absorbed dose (TAR) - answerA: linear energy transfer (LET)
Should you increase your distance from the source to three times the original, your
exposure would become:
A: 9 Times the original
B: 2 times the original
C: 1/9 the original
D: 1/2 the original - answerC: 1/9 the original
This device is used for detection rather than measurement of radiation sources and low
level radioactive contamination.
A: Geiger Muller
B: Scintillation counter
C: TLD badge
D: PIC (pocket Ionization chamber) - answerA: Geiger Muller
Which of the following may fog due to humidity and temperature changes yet is easy to
process and provides a permanent record of exposure?
A: Geiger Muller
B: Scintillation counter
C: TLD badge
D: PIC (pocket Ionization chamber)
E: Film badge - answerE: Film badge
Which of the following are a benefit of TLD over film badges?
1: can be read many times
2: More accurate
,3: Not affected by temperature and pressure
4: Can be worn for longer periods of time
A: 1,3,4
B: 1,2,4
C: 2,3,4
D: 1,2,3 - answerC: 2,3,4
More accurate, not affected by temperature and pressure and can be worn for longer
periods of time
According to the current NCRP recommendations, the guidance level for cumulative
exposure for a 28-year-old occupational worker with three years of experience is:
A: 8 Rem (80 mSv)
B: 28 Rem (280 mSv)
C: 35 Rem (350 mSv)
D: 47 Rem (470 mSv) - answerB: 28 Rem (280 mSv)
Which is not a personnel monitoring device?
A: TLD
B: Film dosimeter
C: Cutie pie
D: Pocket Ionization chamber - answerC: Cutie pie
What is the recommended total dose limit to a fetus?
A: .5 Rem/yr
B: .5 Rem/gestational period
C: .05 Rem/yr
D: .1 Rem/yr - answerB: .5 Rem/gestational period
The limit for a controlled area is:
A: 10 mR/week
B: 100 mR/week
C: 20 mR/hr
D: 10 mR/hr - answerB: 100 mR/week
Audible and visual contact with the patients:
A: May be used only if it is a child
B: Is mandatory for every treatment
C: Doesn't apply to radiation therapy
D: Is optional - answerB: Is mandatory for every treatment
The NRC requires _____ checks and full calibration _____ for a cobalt 60 unit.
A: daily/weekly
B: Weekly/monthly
C: monthly/yearly
D: Weekly/yearly - answerC: monthly/yearly
, In radiation protection, the term controlled area refers to any:
A: Shielded area
B: Area that is occupied by radiation workers
C: Area that has a radiation detector
D: Area that is under the supervision of a radiation safety supervisor - answerD: Area
that is under the supervision of a radiation safety supervisor
A radiation high energy room shall have emergency off buttons installed ________.
A: In the treatment room
B: On the control Console
C: Both of the above
D: None of the above - answerC: Both of the above
In the treatment room and on the control console
A sign " caution radiation this equipment produces radiation when energized" must be
placed in the:
1: Control Console
2: Treatment head
3: Treatment table
A: 1 only
B: 2 only
C: 1,3
D: 1,2,3 - answerA: 1 only
Control Consol
The principal objective in performing field symmetry and flatness checks is the
determination of:
A: Dose rate consistency across the field
B: Dose rate consistency at the central axis
C: Film density across the field
D: Attenuation at the central axis - answerA: Dose rate consistency across the field
The proper sequence of materials traveled by an electron therapy mode of linear
accelerator is:
1: Ion chamber
2: Scattering foil
3: X-ray Collimator
A: 1,2,3 (Ion chamber, scattering foil, x-ray Collimator)
B: 2,1,3 (scattering foil, ion chamber, x-ray Collimator)
C: 3,2,1 (x-ray Collimator, Scattering foil, ion chamber)
D: 3,1,2 (x-ray Collimator, ion chamber, scattering foil) - answerB: 2,1,3
Scattering foil, ion chamber, x-ray Collimator
