LMRT CORE EXAM QUESTIONs AND
ANSWERS GRADED A+
Which of the following are types of gonad shields?
1. Aperture
2. Contact
3. Shadow - ANSWERS>>>>>2 and 3 only
When should gonad shielding be used? - ANSWERS>>>>>when the
gonads are within 5 cm of the radiation field
The greatest cause of unnecessary radiation to the patients that
can be controlled by the limited operator is: -
ANSWERS>>>>>Repeated exposures
The limited operator can reduce repeat exposures by: -
ANSWERS>>>>>clearly instructing patients
How does x-ray beam restriction minimize patient exposure: -
ANSWERS>>>>>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? - ANSWERS>>>>>collimator
,How does filtration reduce patient exposure -
ANSWERS>>>>>removes longer-wavelength photons
What is the national council on radiation protection and
measurements (NCRP) recommendation for the amount of total
filtration? - ANSWERS>>>>>2.5 mm Al equiv
What are the three principle methods used to protect limited
operators from unnecessary radiation exposure? -
ANSWERS>>>>>Time, distance, shielding
Which of the following is not a type of personnel radiation
shielding? - ANSWERS>>>>>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? -
ANSWERS>>>>>scattered radiation from the patient
What is the term for radiation that escapes from the x-ray tube?
- ANSWERS>>>>>Leakage radiation
,why are limited operators prohibited from activities that result in
direct exposure to the primary x-ray beam - ANSWERS>>>>>they
are considered occupationally exposed individuals
distance, as a method used to limit operator exposure, means
that - ANSWERS>>>>>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 - ANSWERS>>>>>scatter radiation
Which of the following is an acronym for a common type of
personnel dosimeter - ANSWERS>>>>>TLD
What is the recommended placement for a personnel dosimeter
on the body of the limited operator? - ANSWERS>>>>>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
What is the NCRP recommended annual effective dose limit for
occupational exposure? - ANSWERS>>>>>50 msv (0.05 Sv)
What is the NCRP recommended monthly effective (or
equivalent) dose limit to the fetus for a pregnant worker? -
ANSWERS>>>>>0.5 msv (0.0005 Sv)
, Radiation monitoring of personnel is required when what
percentage of the annual occupational effective dose limit is
likely to be received? - ANSWERS>>>>>10%
What is the conventional (British system) radiation unit to
express radiation intensity in the air? - ANSWERS>>>>>Roentgen
What is the conventional (British system) unit commonly used to
report occupational dose to radiation workers in the United
States ? - ANSWERS>>>>>REM
What is the conventional (British system) radiation unit for
absorbed dose? - ANSWERS>>>>>Rad
According to the Bergonie-Tribondeau law, the following types of
cells are most radiosensitive - ANSWERS>>>>>embryonic tissue
cells
Which types of x-ray photon interaction with the body is
primarily responsible for the radiation dose absorbed by the
patient? - ANSWERS>>>>>Photoelectric
What is the NCRP recommendation for lead equivalency of
aprons used for personnel protection? - ANSWERS>>>>>0.5 mm
ANSWERS GRADED A+
Which of the following are types of gonad shields?
1. Aperture
2. Contact
3. Shadow - ANSWERS>>>>>2 and 3 only
When should gonad shielding be used? - ANSWERS>>>>>when the
gonads are within 5 cm of the radiation field
The greatest cause of unnecessary radiation to the patients that
can be controlled by the limited operator is: -
ANSWERS>>>>>Repeated exposures
The limited operator can reduce repeat exposures by: -
ANSWERS>>>>>clearly instructing patients
How does x-ray beam restriction minimize patient exposure: -
ANSWERS>>>>>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? - ANSWERS>>>>>collimator
,How does filtration reduce patient exposure -
ANSWERS>>>>>removes longer-wavelength photons
What is the national council on radiation protection and
measurements (NCRP) recommendation for the amount of total
filtration? - ANSWERS>>>>>2.5 mm Al equiv
What are the three principle methods used to protect limited
operators from unnecessary radiation exposure? -
ANSWERS>>>>>Time, distance, shielding
Which of the following is not a type of personnel radiation
shielding? - ANSWERS>>>>>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? -
ANSWERS>>>>>scattered radiation from the patient
What is the term for radiation that escapes from the x-ray tube?
- ANSWERS>>>>>Leakage radiation
,why are limited operators prohibited from activities that result in
direct exposure to the primary x-ray beam - ANSWERS>>>>>they
are considered occupationally exposed individuals
distance, as a method used to limit operator exposure, means
that - ANSWERS>>>>>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 - ANSWERS>>>>>scatter radiation
Which of the following is an acronym for a common type of
personnel dosimeter - ANSWERS>>>>>TLD
What is the recommended placement for a personnel dosimeter
on the body of the limited operator? - ANSWERS>>>>>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
What is the NCRP recommended annual effective dose limit for
occupational exposure? - ANSWERS>>>>>50 msv (0.05 Sv)
What is the NCRP recommended monthly effective (or
equivalent) dose limit to the fetus for a pregnant worker? -
ANSWERS>>>>>0.5 msv (0.0005 Sv)
, Radiation monitoring of personnel is required when what
percentage of the annual occupational effective dose limit is
likely to be received? - ANSWERS>>>>>10%
What is the conventional (British system) radiation unit to
express radiation intensity in the air? - ANSWERS>>>>>Roentgen
What is the conventional (British system) unit commonly used to
report occupational dose to radiation workers in the United
States ? - ANSWERS>>>>>REM
What is the conventional (British system) radiation unit for
absorbed dose? - ANSWERS>>>>>Rad
According to the Bergonie-Tribondeau law, the following types of
cells are most radiosensitive - ANSWERS>>>>>embryonic tissue
cells
Which types of x-ray photon interaction with the body is
primarily responsible for the radiation dose absorbed by the
patient? - ANSWERS>>>>>Photoelectric
What is the NCRP recommendation for lead equivalency of
aprons used for personnel protection? - ANSWERS>>>>>0.5 mm
