Mosbys Comprehensive Review of
Radiography-CHALLENGE TEST #2
which of the following states that the radiosensitivity of cells is directly proportional to
their degree of differentiation - CORRECT ANSWER-Law of Bergonie and Tribondeau
which of the following causes about 95% of cellular response to radiation - CORRECT
ANSWER-indirect effect
when radiation strikes DNA, which of the following occurs? - CORRECT ANSWER-
Direct effect
the amount of radiation that causes the number of genetic mutations in a population to
double is called the - CORRECT ANSWER-Doubling Dose
the SI units of equivalent dose, activity, air kerma, and absorbed dose are, respectively:
- CORRECT ANSWER-Sievert, becquerel, gray and gray in air
Medical xrays are an example of: - CORRECT ANSWER-Artificially produced radiation
the effective dose limit for a fetus for the entire gestational period is - CORRECT
ANSWER-5.0 mSv
the photoelectric effect - CORRECT ANSWER-results in absorption of the incident
photon
the annual effective dose limit for radiographers is - CORRECT ANSWER-50 mSv
the average dose to active bone marrow as an indicator of somatic effects on a
population is called - CORRECT ANSWER-Mean Marrow Dose (MMD)
The annual of radiation deposited per unit length of tissue traversed by incoming
photons is called: - CORRECT ANSWER-Linear energy transfer (LET)
cataractogenesis, life span shortening, embryologic effects, and carcinogenesis are
examples of - CORRECT ANSWER-long term somatic effects
compton interaction: - CORRECT ANSWER-Decreases contrast in the radiographic
image
Gray, multiplied by a radiation weighting factor equals - CORRECT ANSWER-Sievert
, effective dose limit - CORRECT ANSWER-is the level of radiation that an organism can
receive and probaby sustain no appreciable effects
radiation with a high LET: - CORRECT ANSWER-is highly ionizing
Radiation protection is based on which dose response relationship? - CORRECT
ANSWER-linear-nonthreshold
a radiation dose that if received by the entire population would cause the same genetic
injury as the total of doses received by the members actually being exposed is called -
CORRECT ANSWER-Genetically significant dose
a lead apron of at least what thickness should be worn while being exposed to scatter
radiation - CORRECT ANSWER-0.50 mm PB equivalent
use of a thyroid shield of at least what thickness should be used for fluoroscopy -
CORRECT ANSWER-0.50 mm Pb equivalent
how thick are primary protective barriers - CORRECT ANSWER-1/16 inch lead
equivalent
Primary protective barriers, if in the walll, must extend to a height of at least -
CORRECT ANSWER-7 feet
secondary protective barriers must extend to a height of - CORRECT ANSWER-the
ceiling
the protective curtain hanging from the flluoroscopy tower must be at least - CORRECT
ANSWER-0.25 mm Pb equivalent
the Bucky slot cover must be at least - CORRECT ANSWER-0.25 mm Pb equivalent
Filters made of aluminum and copper are placed in the film badge to measure xrays -
CORRECT ANSWER-energy
film badges are changed - CORRECT ANSWER-Monthly
thermoluminescent dosimeters use what type of crystals to record dose - CORRECT
ANSWER-lithium fluoride
TLDs are heated and release what type of energy to indicate dose - CORRECT
ANSWER-Visible light
optically stimulated luminescence - CORRECT ANSWER-10 uSv
Radiography-CHALLENGE TEST #2
which of the following states that the radiosensitivity of cells is directly proportional to
their degree of differentiation - CORRECT ANSWER-Law of Bergonie and Tribondeau
which of the following causes about 95% of cellular response to radiation - CORRECT
ANSWER-indirect effect
when radiation strikes DNA, which of the following occurs? - CORRECT ANSWER-
Direct effect
the amount of radiation that causes the number of genetic mutations in a population to
double is called the - CORRECT ANSWER-Doubling Dose
the SI units of equivalent dose, activity, air kerma, and absorbed dose are, respectively:
- CORRECT ANSWER-Sievert, becquerel, gray and gray in air
Medical xrays are an example of: - CORRECT ANSWER-Artificially produced radiation
the effective dose limit for a fetus for the entire gestational period is - CORRECT
ANSWER-5.0 mSv
the photoelectric effect - CORRECT ANSWER-results in absorption of the incident
photon
the annual effective dose limit for radiographers is - CORRECT ANSWER-50 mSv
the average dose to active bone marrow as an indicator of somatic effects on a
population is called - CORRECT ANSWER-Mean Marrow Dose (MMD)
The annual of radiation deposited per unit length of tissue traversed by incoming
photons is called: - CORRECT ANSWER-Linear energy transfer (LET)
cataractogenesis, life span shortening, embryologic effects, and carcinogenesis are
examples of - CORRECT ANSWER-long term somatic effects
compton interaction: - CORRECT ANSWER-Decreases contrast in the radiographic
image
Gray, multiplied by a radiation weighting factor equals - CORRECT ANSWER-Sievert
, effective dose limit - CORRECT ANSWER-is the level of radiation that an organism can
receive and probaby sustain no appreciable effects
radiation with a high LET: - CORRECT ANSWER-is highly ionizing
Radiation protection is based on which dose response relationship? - CORRECT
ANSWER-linear-nonthreshold
a radiation dose that if received by the entire population would cause the same genetic
injury as the total of doses received by the members actually being exposed is called -
CORRECT ANSWER-Genetically significant dose
a lead apron of at least what thickness should be worn while being exposed to scatter
radiation - CORRECT ANSWER-0.50 mm PB equivalent
use of a thyroid shield of at least what thickness should be used for fluoroscopy -
CORRECT ANSWER-0.50 mm Pb equivalent
how thick are primary protective barriers - CORRECT ANSWER-1/16 inch lead
equivalent
Primary protective barriers, if in the walll, must extend to a height of at least -
CORRECT ANSWER-7 feet
secondary protective barriers must extend to a height of - CORRECT ANSWER-the
ceiling
the protective curtain hanging from the flluoroscopy tower must be at least - CORRECT
ANSWER-0.25 mm Pb equivalent
the Bucky slot cover must be at least - CORRECT ANSWER-0.25 mm Pb equivalent
Filters made of aluminum and copper are placed in the film badge to measure xrays -
CORRECT ANSWER-energy
film badges are changed - CORRECT ANSWER-Monthly
thermoluminescent dosimeters use what type of crystals to record dose - CORRECT
ANSWER-lithium fluoride
TLDs are heated and release what type of energy to indicate dose - CORRECT
ANSWER-Visible light
optically stimulated luminescence - CORRECT ANSWER-10 uSv
