ARRT Test Prep, LIMITED X-RAY CORE Test Questions And Answers 100% Pass.
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Course
Radiology
Institution
Radiology
ARRT Test Prep, LIMITED X-RAY CORE
Test Questions And Answers 100% Pass.
Main property of x-radiation that makes it potentially hazardous is its ability to? -
AnswerIonize
Describe the damage potential of ionization? - AnswerChain reaction in the human body that
may eventually cause biologic d...
ARRT Test Prep, LIMITED X-RAY CORE
Test Questions And Answers 100% Pass.
Main property of x-radiation that makes it potentially hazardous is its ability to? -
Answer✔Ionize
Describe the damage potential of ionization? - Answer✔Chain reaction in the human body that
may eventually cause biologic damage. X-rays are from the Electric Magnetic Spectrum or
radiation energy and is considered harmful in high energy ranges.
What is the most likely potential hazard working with diagnostic radiology? -
Answer✔Carcinogenesis - Stochastic/Non-Threshold Effect
.1 Rem = ? Seivert - Answer✔1 Sievert
0.1 Gray = ? Rad - Answer✔10 Rad
1 Gray = ? Rad - Answer✔100 Rad
What is Aplastic Anemia? When dose it occur? - Answer✔All types of blood cells: Red & White
25 Rads
A decrease in blood count is the earliest response seen to dose radiation. It can occur at dosease
as low as? - Answer✔25 Rads or .25 Gray
What is Cataractogenesis? - Answer✔Process of Cataract Formation
Cataractogenesis occurs after acute or chronic exposures of how many Rads? - Answer✔200
Rads, 2 Gray
Skin Eyrythemia (Skin Redning) occurs above? - Answer✔Above 200 Rad, 2 Gray
Temporary Sterility occurs in the adult male at acute doses of how many Rads? - Answer✔250
Rads, 2.5 Gray
Pregnant radiographer should? (3) - Answer✔Always practice TDS
Has legal right for re-assignment of duty
Never confuse collar badge with waist badge
Monthly dosimetry reports is based on what? - Answer✔OCCUPATIONAL exposures only.
Monthly Dosimeter reports does NOT include? - Answer✔Natural or Background Radiation
What is the recommended monthly dose-equivalent limit for the fetus in the third trimester? -
Answer✔0.5 mSv
.05 Rem
NRCP 116
Radiation workers cumulative dose-equivalent limit is determined by? - Answer✔Age x 10 mSv
Age x 1 Rem
NCRP 110
What is the Occupational radiation dose equivalent limit for stochastic effects to the whole body?
- Answer✔50 mSv (5 Rem)
When using a C-Arm mobile unit, the intensification tower should be? - Answer✔As close as
possible to the patient to reduce patient dose and unnecessary magnification.
Radiation exposure in air = ? - Answer✔Roentgens - Ionization in air dose measurement.
Electrical current being generated by a charge created in air thru ionization by x/gamma radiation
is called a? - Answer✔Ion Chamber
The quantity of radiation exposure measured by an ionization chamber would be? -
Answer✔Coulomb/Kilogram
The C/Kg or R is usually the unit measured in? - Answer✔Air dose
List the 3 measurements that are more appropriate for measuring absorbed doses for radiation or
occupational dose? - Answer✔Gray (1) - Rad (100)
Seivert (1) - Rem (100)
Curie - Bacquerel
What type of changes are used to measure occupational dose? (3) - Answer✔Scintillation
Biological
Chemical
Example of personnel monitor that measures radiation thru chemical change reaction? -
Answer✔Film Badge - Operate off Gurney-Mott theory.
Explain the Gurney-Mott Theory...? - Answer✔Describes how an x-ray photon changes silver
halide into atomic silver in the film emulsion--a definite chemical change.
How long can a film badge be worn? - Answer✔No more than a month
Why shouldn't film badges be worn greater than a month? - Answer✔Extreme sensitivity to
environmental conditions.
TLD's operate thru? - Answer✔Luminescence (NO chemical rx's occur)
Pocket dosimeters can only work for? - Answer✔1 day and must be reset everyday.
Upper reading limit of 200-300 rads
Pocket dosimeter uses? - Answer✔Electrical current as a measurement of charge.
The type of personnel monitor that could be worn the longest is the? - Answer✔OSD
Optical stimulated detector can be worn up to? - Answer✔3 months and be sensitive to 2 mR
Leakage radiation should NOT exceed how much mR at 1 meter from the scource? -
Answer✔100 mR per hr
0.1 Rad per hr
NCRP 102
According to Bushong, tabletop intensity should NOT exceed what? - Answer✔2.1 mR per min
for each mA operating at 80 kVp.
Under normal modes of operation, fluoroscopic procedures should NOT exceed? - Answer✔10
Renkens per min.
What does GSD stand for? - Answer✔Genetic Significant Dose
What is GSD? - Answer✔Average gonadal dose received by an exposed population. It is used to
estimate the genetic impact of medical radiation dose on the entire population.
Beam limiting devices will? (3) - Answer✔Improve image quality
Reduce patient dose
Reduce scatter radiation
The purpose of reducing added filtration is to reduce radiation dose to? - Answer✔Patients skin
Recommended amount of filtration in Fluoro? - Answer✔3 mm Al Equivalent
Disadvantage to having 3 mm Al Equivalent? - Answer✔Would require an increase in technical
factors defeating the purpose of filtration.
What is the usual amount of filtration in Fluoro? - Answer✔2.5 mm Al Equivalent
What effect does excessive filtration have on xray image? - Answer✔Reduced contrast
# of grid lines per inch or centimeter defines? - Answer✔Grid Frequency
For all dedicated chest units whose tube potential routinely exceeds 90 kVp, the minimum
recommended grid ratio is? - Answer✔8:1
Techniques below or at 90 kVp would utilize what grid ratio? - Answer✔8:1
Techniques above 90 kVp would utilize what grid ratio? - Answer✔12:1
What is the ratio of a grid whose lead strips are 0.25 mm thick, 1.6 mm high and are seperated by
a 0.10 mm alluminum spacer? - Answer✔16:1 grid
During latent image formation, the concentration of metallic silver in the exposed crystals occurs
in the region of the sensitivity specks. This explanation of the formation of the image is reffered
to as? - Answer✔Gurney-Mott theory
What type of interactions cause ionization of irradiated material? - Answer✔Photoelectric -
Changes inner shell electrons
Compton - Affects outer shell electrons
Which of the following xray interactions with matter is primarily responsible for contrast? -
Answer✔Photoelectric effect
Radiation produces at very discrete energies of approx 69 kiloelectron colts (kev) when electrons
interact with the K shell of the tungsten target atom is called? - Answer✔Characteristic
Radiation
Pair-Production affects what portion of the cell? - Answer✔Nucleus. It does NOT cause
ionization.
What type of radiation would produce the greatest amount of biological damage in human tissue?
- Answer✔High LET's
What is the active component of the TLD? - Answer✔Lithium Fluoride
What is used in input phosphors? - Answer✔Cesium Iodide
What is used in output phosphors? - Answer✔Zinc Cadmium Sulfide
What must be done to Xray film to make it compatible to rare earth phosphors? - Answer✔Add
light absorbing dye in the x-ray film emulsion
About what percentage of radiographic density is due to light emitted by an intensifying screen
phosphor? - Answer✔95-98%
What occurs when exit radiation interacts with a Photo-Stimulable imaging plate? -
Answer✔Energy Absorption
What is used in scintillation gamma cameras in nuclear medicine/CT? - Answer✔Sodium Iodide
What color of light emitted by lanthanum oxy-bromide rare earth crystals in the intensifying
screen? - Answer✔Blue
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