EXAM WITH LATEST VERSIONS GRADED A+
At which energy range does photodisintegration occur? - ANSWER//Above 10
megaelectron volts (MeV).
Which regulatory agency has the authority to control the possession, use, and
production of atomic energy in the interest of national security? - ANSWER//Nuclear
Regulatory Commission
Which value represents the annual maximum dose limit (in millisieverts - mSv) for
exposure to the extremities in medical imaging personnel? - ANSWER//500 mSv
Which is the maximum allowable exposure to the embryo or fetus each month? -
ANSWER//0.5 millisieverts (mSv).
Which procedures should imaging personnel perform in order to reduce exposure time
during fluoroscopic procedures? (Select the three that apply.) - ANSWER//Use the last
image hold feature.
Use the pulsed progressive mode.
Reset the cumulative timer before procedure.
Which term means the loss or change of a nitrogenous base in the DNA chain? -
ANSWER//Mutation
What is the advantage of using a high kilovolts peak (kVp), low milliamperage seconds
(mAs) technique with digital radiography (DR) systems? - ANSWER//Patient exposure
decreases
For which lumbar spine projections should a shaped contact shield be applied to
provide protection for the gonads of a male patient? - ANSWER//AP
AP Oblique right Oblique
l5-S1 lateral spot
Which type of interaction results in the production of bremsstrahlung x-rays? -
ANSWER//A projectile electron slows down near the nucleus of the target atom
Which human cell is the most resistant to the effects of radiation? - ANSWER//Neurons
For which purpose is gonadal shielding recommended? - ANSWER//To reduce the
probability of genetic mutations.
What is the primary purpose of beam filtration? - ANSWER//Protect patient from low
energy xrays
, What is the minimum recommended filtration for general diagnostic x-ray units? -
ANSWER//2.5 mm Al.
When a pregnant patient must undergo a radiographic procedure, which practices will
minimize radiation exposure? (Select the three that apply.) - ANSWER//Select
appropriate exposure factors for the part being imaged.
Collimate to include only the area of interest.
Shield the abdomen and pelvis whenever this does not interfere with the image.
A radiographer stands six feet from the x-ray source when performing a portable chest
exam and receives an exposure of 2 mGy. If the radiographer performs a repeat exam
using the same technical factors standing at a distance of three feet from the source,
how much exposure will be received? - ANSWER//8 mGy
Biologic damage resulting from the ionization of key atoms causing these molecules to
become inactive or functionally altered is much more likely to occur after exposure to
which type of radiation? - ANSWER//HIgh-LET radiation such as alpha particles.
Which combination of technical factors is recommended to reduce patient dose? -
ANSWER//High kilovolts peak (kVp), low milliamperage in seconds (mAs).
Which is the most likely result if an exposure is made without the use of a focusing cup?
- ANSWER//Increased off focus radiation.
How many millimeters of lead equivalency is recommended for lead aprons worn by
pregnant radiographers? - ANSWER//0.5
Which method should be the first choice to reduce exposure to the reproductive organs
in every radiographic exam? - ANSWER//Collimate to include only the anatomy of
interest.
How should a mobile C-arm fluoroscope be positioned to provide maximum radiation
protection to the operator? - ANSWER//With the x-ray tube under the patient and as far
from the patient as possible.
Which term is used to describe the intensity of the x-ray beam? - ANSWER//Quantity
A six-year-old pediatric patient arrives in the radiology suite for a radiograph of the
abdomen. Which set of technical factors provides the best radiation protection? -
ANSWER//82 kilovolt-peak (kVp), 7.5 milliampere-seconds (mAs).
Which whole-body dose most closely approximates the LD 50/30 for humans? -
ANSWER//3 Sievert (Sv
What is the annual occupational effective dose limit for a non-pregnant radiation
worker? - ANSWER//50 mSv.