LMRT-Radiography Essentials Questions
and Answers 100% Solved
What is the NCRP recommended annual effective dose limit for occupational exposure
Correct Answ_5.0 rem (0.05 severt)
What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a
prego worker? Correct Answ_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 Correct Answ_10%
What is the conventional (British system) radiation unit to express radiation intensity in air?
Correct Answ_Roentgen
The conventional unit commonly used to report occupational dose to radiation workers in the
U.S. is the: Correct Answ_rem
What is the conventional (British system) radiation unit of absorbed dose Correct Answ_Rad
,According to the Bergonie Tribondeau law, which of the following types of cells are most
radiosensitive? Correct Answ_Embryonic tissue cells
Which type of x-ray photon interaction with the body is primarily responsible for the radiation
dose absorbed by the pt? Correct Answ_Photoelectric
What is the (NCRP) recommendation for lead equivalency of aprons used for personnel
protection? Correct Answ_0.5 mm
What is erythema, as it relates to radiation exposure? Correct Answ_reddening of the skin
caused by a high radiation dose
What is the guiding philosophy of radiation protection? Correct Answ_ALARA as low as
reasonably achievable
Which of the following statements reflects current scientific opinion regarding the effects of
diagnostic levels of ionizing radiation Correct Answ_There is an increased risk of cancer,
leukemia, birth defects, and cataracts
,Which of the following changes will decrease patient dose? Correct Answ_*using a faster-
speed class imaging system
*Increasing the kVp using the 15% rule while decreasing the mAs to compensate
When radiation exposure occurs during pregnancy, the greatest risk of birth defects occurs when
the exposure: Correct Answ_1. exceeds 5 rad to the uterus
2. occurs within the first trimester of pregnancy
At what kVp levels do Compton interactions occur Correct Answ_They occur throughout the
diagnostic radiology kVp range
What is the principal source of scatter radiation in radiography Correct Answ_the IR
What are the four essential elements required for x-ray production Correct Answ_1. target
2. vacuum
3. electron source
4. high potential difference
, The greatest portion of the x-ray beam is made up of: Correct Answ_Bremsstrahlung
Radiation
The penetrating power of the x-ray beam is controlled by varying the: Correct
Answ_Kilovoltage (kVp)
Which of the following functions involve the autotransformer Correct Answ_kVp selection
What is the IR that is used for computed radiography Correct Answ_photostimulable
phosphor
plate
Nearly all new x-ray machines manufactured today use____________generators. Correct
Answ_high frequency
The target of the x-ray tube is made of: Correct Answ_Tungsten
and Answers 100% Solved
What is the NCRP recommended annual effective dose limit for occupational exposure
Correct Answ_5.0 rem (0.05 severt)
What is the NCRP recommended monthly effective (or equivalent) dose limit to the fetus for a
prego worker? Correct Answ_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 Correct Answ_10%
What is the conventional (British system) radiation unit to express radiation intensity in air?
Correct Answ_Roentgen
The conventional unit commonly used to report occupational dose to radiation workers in the
U.S. is the: Correct Answ_rem
What is the conventional (British system) radiation unit of absorbed dose Correct Answ_Rad
,According to the Bergonie Tribondeau law, which of the following types of cells are most
radiosensitive? Correct Answ_Embryonic tissue cells
Which type of x-ray photon interaction with the body is primarily responsible for the radiation
dose absorbed by the pt? Correct Answ_Photoelectric
What is the (NCRP) recommendation for lead equivalency of aprons used for personnel
protection? Correct Answ_0.5 mm
What is erythema, as it relates to radiation exposure? Correct Answ_reddening of the skin
caused by a high radiation dose
What is the guiding philosophy of radiation protection? Correct Answ_ALARA as low as
reasonably achievable
Which of the following statements reflects current scientific opinion regarding the effects of
diagnostic levels of ionizing radiation Correct Answ_There is an increased risk of cancer,
leukemia, birth defects, and cataracts
,Which of the following changes will decrease patient dose? Correct Answ_*using a faster-
speed class imaging system
*Increasing the kVp using the 15% rule while decreasing the mAs to compensate
When radiation exposure occurs during pregnancy, the greatest risk of birth defects occurs when
the exposure: Correct Answ_1. exceeds 5 rad to the uterus
2. occurs within the first trimester of pregnancy
At what kVp levels do Compton interactions occur Correct Answ_They occur throughout the
diagnostic radiology kVp range
What is the principal source of scatter radiation in radiography Correct Answ_the IR
What are the four essential elements required for x-ray production Correct Answ_1. target
2. vacuum
3. electron source
4. high potential difference
, The greatest portion of the x-ray beam is made up of: Correct Answ_Bremsstrahlung
Radiation
The penetrating power of the x-ray beam is controlled by varying the: Correct
Answ_Kilovoltage (kVp)
Which of the following functions involve the autotransformer Correct Answ_kVp selection
What is the IR that is used for computed radiography Correct Answ_photostimulable
phosphor
plate
Nearly all new x-ray machines manufactured today use____________generators. Correct
Answ_high frequency
The target of the x-ray tube is made of: Correct Answ_Tungsten
