Limited scope of radiography practice
Exam Questions and All Correct
Answers.
what statements are correct regarding the link between radiation and genetic effects - Answer
The link has been demonstrated in animal studies.
Increased risk to humans cannot be predicted with respect to an individual.
The changes in kilovoltage (kVp) will result in the greatest reduction of patient dose, when
milliampere-seconds (mAs) is adjusted to compensate for the change - Answer Increase kVp
by 30%
The following image receptor (IR) system speeds will result in the lowest patient dose - Answer
Faster speed IR system
The primary purpose of using gonad shields - Answer reduce the likelihood of genetic effects
Are gonad shields - Answer Contact and shadow
gonad shielding should be used - Answer when the gonads are within 5 cm of the radiation
field
the greatest cause of unnecessary radiation to patients that can be controlled by the limited
operator is - Answer repeat exposures
the limited operator can reduce repeat exposure - Answer clearly instructing patients
how does the x-ray beam restriction minimize patient exposure - Answer it limits the
radiation field to the area of interest
what is the device that allows the limited operator to vary the size of the radiation field -
Answer collimator
how does filtration reduce patient exposure - Answer removes longer-wavelength photons
The National Council on Radiation Protection and Measurements(NCRP) recommendation for
the amount of total filtration - Answer 2.5 mm Al equiv
,Three principal methods used to protect limited operators from unnecessary radiation exposure
- Answer time, distance, and shielding
The following is not a type of personal radiation shielding - Answer Shadow
personnel shielding must be worn on the rare occasion during which the limited operator may
need to remain in the radiographic room during an exposure to assist the patient in maintaining
the proper position. What is the source of the greatest radiation hazard under this
circumstance.? - Answer scattered radiation from the patient
the term for radiation the escapes from the x-ray tube housing - Answer leakage radiation
why are limited operators prohibited from activities that result in direct exposure to the primary
x-ray beam - Answer they are considered occupationally exposed individuals
distance, as a method used to limit operator exposure, means that - Answer the operator
should maximize the distance from the source during an exposure
shielding worn for personnel protection is designed to attenuate what source of exposure -
Answer scatter radiation
the acronym for a common type of personnel dosimeter - Answer TLD
What is the recommended placement for personnel dosimeter on the body of the limited
operator - Answer the badge should be worn in the region of the collar on the anterior
surface of the body and outside the lead apron, if worn
The NCRP recommended annual effective dose limit for occupational exposure - Answer 5.0
rem (0.05 Sv)
The NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a pregnant
worker - Answer 0.05 rem (0.0005 Sv)
Radiation monitoring of personnel is required when what percentage of the annual
occupational effective dose limit is likely to be received - Answer 10%
The conventional (British system) radiation unit to express radiation intensity in the air - Answer
Roentgen
, The conventional (British system) unit commonly used to report occupational dose to radiation
workers in the United States is the - Answer rem
What is the conventional (British system) radiation unit of absorbed dose - Answer Rad
According to the Bergonie-Tribondeau law, the following types of cells are most radiosensitive -
Answer embryonic tissue cells
Type of x-ray photon interaction with the body is primarily responsible for the radiation dose
absorbed by the patient - Answer Photoelectric
The NCRP (report #102) recommendation for lead equivalency of aprons used for personnel
protection - Answer 0.5 mm
Erythema as it relates to radiation exposure - Answer reddening of the skin caused by a high
radiation dose
The guiding philosophy of radiation protection - Answer ALARA--as low as reasonably
achievable
The following statements reflects current scientific opinion regarding the effects of diagnostic
levels of ionizing radiation - Answer There is an increased risk of cancer, leukemia, birth
defects, and cataracts
The following changes will decrease patient dose - Answer using a faster-speed class imaging
system
increasing the grid ratio to a 16:1 ratio
When radiation exposure occurs during pregnancy, the greatest risk of birth defects occurs
when the exposure - Answer exceeds 5 rad to the uterus
occurs within the first trimester of pregnancy
At what kVp levels do Compton interactions occur - Answer they occur throughout the
diagnostic radiology kVp range
The principal source of scatter radiation in radiography - Answer The IR
Exam Questions and All Correct
Answers.
what statements are correct regarding the link between radiation and genetic effects - Answer
The link has been demonstrated in animal studies.
Increased risk to humans cannot be predicted with respect to an individual.
The changes in kilovoltage (kVp) will result in the greatest reduction of patient dose, when
milliampere-seconds (mAs) is adjusted to compensate for the change - Answer Increase kVp
by 30%
The following image receptor (IR) system speeds will result in the lowest patient dose - Answer
Faster speed IR system
The primary purpose of using gonad shields - Answer reduce the likelihood of genetic effects
Are gonad shields - Answer Contact and shadow
gonad shielding should be used - Answer when the gonads are within 5 cm of the radiation
field
the greatest cause of unnecessary radiation to patients that can be controlled by the limited
operator is - Answer repeat exposures
the limited operator can reduce repeat exposure - Answer clearly instructing patients
how does the x-ray beam restriction minimize patient exposure - Answer it limits the
radiation field to the area of interest
what is the device that allows the limited operator to vary the size of the radiation field -
Answer collimator
how does filtration reduce patient exposure - Answer removes longer-wavelength photons
The National Council on Radiation Protection and Measurements(NCRP) recommendation for
the amount of total filtration - Answer 2.5 mm Al equiv
,Three principal methods used to protect limited operators from unnecessary radiation exposure
- Answer time, distance, and shielding
The following is not a type of personal radiation shielding - Answer Shadow
personnel shielding must be worn on the rare occasion during which the limited operator may
need to remain in the radiographic room during an exposure to assist the patient in maintaining
the proper position. What is the source of the greatest radiation hazard under this
circumstance.? - Answer scattered radiation from the patient
the term for radiation the escapes from the x-ray tube housing - Answer leakage radiation
why are limited operators prohibited from activities that result in direct exposure to the primary
x-ray beam - Answer they are considered occupationally exposed individuals
distance, as a method used to limit operator exposure, means that - Answer the operator
should maximize the distance from the source during an exposure
shielding worn for personnel protection is designed to attenuate what source of exposure -
Answer scatter radiation
the acronym for a common type of personnel dosimeter - Answer TLD
What is the recommended placement for personnel dosimeter on the body of the limited
operator - Answer the badge should be worn in the region of the collar on the anterior
surface of the body and outside the lead apron, if worn
The NCRP recommended annual effective dose limit for occupational exposure - Answer 5.0
rem (0.05 Sv)
The NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a pregnant
worker - Answer 0.05 rem (0.0005 Sv)
Radiation monitoring of personnel is required when what percentage of the annual
occupational effective dose limit is likely to be received - Answer 10%
The conventional (British system) radiation unit to express radiation intensity in the air - Answer
Roentgen
, The conventional (British system) unit commonly used to report occupational dose to radiation
workers in the United States is the - Answer rem
What is the conventional (British system) radiation unit of absorbed dose - Answer Rad
According to the Bergonie-Tribondeau law, the following types of cells are most radiosensitive -
Answer embryonic tissue cells
Type of x-ray photon interaction with the body is primarily responsible for the radiation dose
absorbed by the patient - Answer Photoelectric
The NCRP (report #102) recommendation for lead equivalency of aprons used for personnel
protection - Answer 0.5 mm
Erythema as it relates to radiation exposure - Answer reddening of the skin caused by a high
radiation dose
The guiding philosophy of radiation protection - Answer ALARA--as low as reasonably
achievable
The following statements reflects current scientific opinion regarding the effects of diagnostic
levels of ionizing radiation - Answer There is an increased risk of cancer, leukemia, birth
defects, and cataracts
The following changes will decrease patient dose - Answer using a faster-speed class imaging
system
increasing the grid ratio to a 16:1 ratio
When radiation exposure occurs during pregnancy, the greatest risk of birth defects occurs
when the exposure - Answer exceeds 5 rad to the uterus
occurs within the first trimester of pregnancy
At what kVp levels do Compton interactions occur - Answer they occur throughout the
diagnostic radiology kVp range
The principal source of scatter radiation in radiography - Answer The IR
