RADS 2100 Safety Mock Test
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53 Terms
Which of the following is the NCRP recommended annual effective dose limit for occupational workers?
5 rem (50 mSv)
3 multiple choice options
Which of the following is the NCRP recommended annual effective dose limit for occupational workers of the skin, hands and feet?
5 rem (50 mSv)
3 multiple choice options
According to the NCRP, the annual occupational dose equivalent limit to the lens of the eye is:
150 mSv
3 multiple choice options
The biological effects of radiation are known to be influenced by all of the following EXCEPT:
size of the cells in the tissue exposed
3 multiple choice options
A latent period is defined as:
time between radiation exposure and resultant effects
3 multiple choice options
What type of dose-response relationship represents radiation-induced leukemia and genetic effects?
linear nonthreshold
3 multiple choice options
All of the following function to reduce patient dose EXCEPT:
a high ratio grid
3 multiple choice options
The severity of radiation would be:
dependent on the dose received and the type of tissue irradiated
3 multiple choice options
If the intensity of radiation from an x-ray tube is 20 mR/minute at a distance of 8 feet, the intensity measured at a distance of 4 feet will be:
80 mR/minute
3 multiple choice options
The gray may be described as:
energy deposited in an absorber
3 multiple choice options
Which of the following cells is MOST sensitive to radiation?
lymphocyte
3 multiple choice options
Which of the following would be considered natural background radiation?
radon
3 multiple choice options
Relative biologic effectiveness (RBE):
is a comparison of dose of test radiation to a dose of 250 keV that produces the same biologic response
3 multiple choice options
What is the dose response relationship of choice for radiation protection standards?
linear, non-threshold
3 multiple choice options
According to the Law of Bergonie and Tribondeau, which of the following cells are particularly sensitive?
1. older, mature cells
2. stem (undifferentiated or precursor) cells
3. highly mitotic cells
2 and 3 only
3 multiple choice options
Which of the following will assist in minimizing exposure to the patient?
1. collimation
2. use of grids
3. high kVp, low mAs techniques
1 and 3 only
3 multiple choice options
The photoelectric effect is an interaction between an x-ray photon and:
an inner-shell electron
3 multiple choice options
Which of the following will keep patient dose to a minimum during fluoroscopy?
1. pulsed fluoroscopy
2. using magnification mode
3. collimation shutters closed to viewing size
1 and 3 only
3 multiple choice options
When should gonad shielding be used?
1. for any patient with reproductive potential
2. when gonads lie within 5 cm of the primary beam
3. when shielding will not compromise the exam
1, 2 and 3
3 multiple choice options
An optically stimulated luminescence dosimeter contains which of the following detectors?
aluminum oxide
3 multiple choice options
Nonthreshold:
assumes that any radiation dose produces an effect
3 multiple choice options
The source-table top distance must not be less than _____ for fixed fluoroscopes and not less than _____ for mobile fluoroscopes.
15 inches, 12 inches
3 multiple choice options
Which of the following exposure techniques will provide the least amount of radiation exposure to the patient?
50 mAs, 90 kVp
3 multiple choice options
A change in which of the following will NOT affect the radiation dose received by a patient if all other exposure factors remain the same?
focal spot size
3 multiple choice options
In the production of Bremsstrahlung radiation, the incident electron:
is deflected, with resulting energy loss
3 multiple choice options
If the exposure rate to a radiographer positioned 3 feet from a radiation source is 8 mR/min, what will be the dose to the radiographer at a distance of 6 feet from the source?
2 mR/min
3 multiple choice options
Most of the scattered radiation produced during radiographic procedures is the direct result of:
Compton interactions
3 multiple choice options
Proper collimation does each of the following EXCEPT:
eliminate the need for gonad shielding
3 multiple choice options
Most of the inherent filtration of typical x-ray equipment comes from the:
window of the glass envelope
3 multiple choice options
Personnel dosimeters shall be worn if there is a possibility of an individual receiving ____ of the dose limits.
1/10
3 multiple choice options
The sum of the weighted equivalent doses for all irradiated tissues and organs is the:
effective dose
3 multiple choice options
Personal monitoring devices include all of the following except:
an ionization chamber
3 multiple choice options
Which of the following is located between the patient and the image receptor?
ionization chamber
3 multiple choice options
What is the approximate entrance skin exposure for a 15 cm AP abdomen produced at 70 kVp, 20 mAs, and a SID of 40 inches (100 cm) if 70 kVp = 2.5 mR/mA?
69 mR
3 multiple choice options
How tall must primary protective barriers be?
7 feet
3 multiple choice options
What quantity of radiation exposure to the reproductive organs is required to cause temporary infertility?
200 rad
3 multiple choice options
Which of the following is not an acute local tissue effect of radiation exposure?
cataracts
3 multiple choice options
A whole body radiation dose given in a period of seconds to minutes produces a clinical pattern called:
acute radiation syndrome
3 multiple choice options
Which of the following types of gonad shielding is positioned in the primary beam immediately below the collimator?
shadow shield
3 multiple choice options
The function of filtration in diagnostic radiology is to:
increase beam hardness, thus reducing patient skin dose
3 multiple choice options
What is the unit of equivalent dose?
rem
2 multiple choice options
Half-value layer (HVL) is defined as the thickness of a designated absorber required to:
decrease the intensity of the primary beam by 50% of its initial value
3 multiple choice options
Which of the following may result in occupational exposure for the radiographer?
Compton interaction
3 multiple choice options
Which of the following is responsible for producing free radicals?
Indirect effect
3 multiple choice options
Cells are more radiosensitive when:
fully oxygenated
3 multiple choice options
Most somatic effects occur:
at doses beyond those used during diagnostic radiography
3 multiple choice options
Which of the following is considered late somatic effects?
carcinogenesis
3 multiple choice options
The radiation dose that would cause the same genetic injury to the population as the sum of doses received by individuals actually being exposed is called:
GSD
3 multiple choice options
The NCRP recommends a minimum of _______ lead equivalent for aprons worn by occupationally exposed individuals.
0.5 mm
3 multiple choice options
Exposure rate limitation for fluoroscopy limits skin exposure rates to a minimum of _____ per minute.
10 R
3 multiple choice options
The lowest intensity of scatter radiation from the patient is located:
at a 90 degree angle from the patient
3 multiple choice options
The amount of energy deposited by radiation per unit length of tissue being traversed is:
linear energy transfer
3 multiple choice options
The Bucky slot cover contains a minimum of _____ lead equivalent.
0.25 mm
3 multiple choice options
