TIONS AND VERIFIED ANSWERS | GRADED A+| PASS ON FIRST AT-
What statements are correct regarding the link between radiation and genetic effects - AN-
SWER 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 - AN-
SWER 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 radia-
tion 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 ra-
diation field to the area of interest
1
,what is the device that allows the limited operator to vary the size of the radiation field - AN-
SWER collimator
how does filtration reduce patient exposure - ANSWER removes longer-wavelength pho-
tons
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 expo-
sure - 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 radia-
tion
why are limited operators prohibited from activities that result in direct exposure to the pri-
mary x-ray beam - ANSWER they are considered occupationally exposed individuals
distance, as a method used to limit operator exposure, means that - ANSWER the opera-
tor 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
2
, 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 preg-
nant worker - ANSWER 0.05 rem (0.0005 Sv)
Radiation monitoring of personnel is required when what percentage of the annual occupa-
tional effective dose limit is likely to be received - ANSWER 10%
The conventional (British system) radiation unit to express radiation intensity in the air - AN-
SWER Roentgen
The conventional (British system) unit commonly used to report occupational dose to radia-
tion 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 radiosensi-
tive - 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
3
What statements are correct regarding the link between radiation and genetic effects - AN-
SWER 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 - AN-
SWER 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 radia-
tion 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 ra-
diation field to the area of interest
1
,what is the device that allows the limited operator to vary the size of the radiation field - AN-
SWER collimator
how does filtration reduce patient exposure - ANSWER removes longer-wavelength pho-
tons
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 expo-
sure - 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 radia-
tion
why are limited operators prohibited from activities that result in direct exposure to the pri-
mary x-ray beam - ANSWER they are considered occupationally exposed individuals
distance, as a method used to limit operator exposure, means that - ANSWER the opera-
tor 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
2
, 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 preg-
nant worker - ANSWER 0.05 rem (0.0005 Sv)
Radiation monitoring of personnel is required when what percentage of the annual occupa-
tional effective dose limit is likely to be received - ANSWER 10%
The conventional (British system) radiation unit to express radiation intensity in the air - AN-
SWER Roentgen
The conventional (British system) unit commonly used to report occupational dose to radia-
tion 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 radiosensi-
tive - 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
3
