Mosbys Comprehensive Review of
Radiography-CHALLENGE TEST #2
2025 Questions and Answers
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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, the average dose to active bone marrow as an indicator of somatic effects on a
population is called - --CORRECT ANSWER--Mean Marrow Dose (MMD)
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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
Radiography-CHALLENGE TEST #2
2025 Questions and Answers
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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, the average dose to active bone marrow as an indicator of somatic effects on a
population is called - --CORRECT ANSWER--Mean Marrow Dose (MMD)
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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
