RADT 1022 Exam 3 Questions with Correct Answers
When radiation hits a cell, there are four possible results: - Answer Pass through without any damage
Temporary damage, but cell regains normal function
Damage cell without cell recovering
Kill the cell
The "Direct Hit" theory of cell irrad...
RADT 1022 Exam 3 Questions with
Correct Answers
When radiation hits a cell, there are four possible results: - Answer ✔ Pass through
without any damage
Temporary damage, but cell regains normal function
Damage cell without cell recovering
Kill the cell
The "Direct Hit" theory of cell irradiation can be described by which of the following
statements?
A. The DNA molecule is struck
B. The cell nucleus is struck
C. The cell cytoplasm is struck
D. The cell is ionized - Answer ✔ A. The DNA molecule is struck
A "direct hit" means the radiation struck the DNA molecule. Whereas, an "indirect hit"
means the radiation struck a water molecule which released a free radical that struck
the DNA.
Law of Bergonie and Tribondeau - Answer ✔ cells are most sensitive to radiation when
they are immature, undifferentiated, and rapidly dividing
The latent period in radiation biology is the time between: - Answer ✔ exposure to x-
radiation and clinical symptoms
Acute Radiation Syndrome (ARS) - Answer ✔ Symptoms of short term radiation effects
after a massive dose of ionizing radiation
Genetic radiation damage - Answer ✔ damage to the genetic code of the germ cell
contained in the DNA; may be passed to the next generation
What are the sources of exposure? - Answer ✔ X-rays (external) and radionuclides
(internal)
, How do radiographers protect patients? - Answer ✔ Exposure factors
Filtration
Collimating
Less repeating exposures
Shielding
Dosimetry - Answer ✔ Measure of radiation dose to an individual
Optically Stimulated Luminescence Dosimeter (OSL) - Answer ✔ Measures radiation
that passes through a thin strip of aluminum oxide. A laser light stimulates the aluminum
oxide, which becomes luminescent in proportion to the amount of radiation exposure.
Very accurate
Where should the dosimeter be worn? - Answer ✔ outside of lead apron @ level of
collar
Thermoluminescent Dosimeter (TLD) - Answer ✔ A dose-measuring device that gives
off light when heated; it consists of a plastic badge containing one or more lithium
fluoride crystals.
IVP (intravenous pyelogram) - Answer ✔ Is a special x-ray examination of the kidneys,
bladder, and ureters (the tubes that carry urine from the kidneys to the bladder).
KVP is adjusted to control the: - Answer ✔ Radiographic contrast, energy of the beam,
penetrating quality of the beam
A portable fluoroscope is also called a: - Answer ✔ C-arm
Total filtration in the x-ray tube must be the equivalent of at least: - Answer ✔ 2.5 mm
aluminum
Barium enemas are often supplemented with, or replaced by: - Answer ✔ endoscopy
and CT
The quality of an x-ray beam is determined by the: - Answer ✔ kVp
MAS is adjusted to control the: - Answer ✔ amount of x-rays produced
X-ray contrast studies of certain joints , such as the knee and shoulder, are called: -
Answer ✔ Arthograms
Density of the radiograph is a function of: - Answer ✔ the kilovoltage applied, the
milliamperage, the time of exposure
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