ARRT Mosby Challenge Test 1
Questions with Accurate Answers
1. Attenuation: correct answer Describes changes in the x ray beam as it travels
through the patient
According to NCRP Report #160, the increase in total exposure is primarily
attributed to increased use of: correct answer CT
Background radiation is the source of approximately what of human exposure?
percent correct answer 50%
Calipers are used to measure: correct answer thickness Patient part
Cell damage may be exhibited as: correct answer Loss of function or abnormal
function
Cells that are oxygenated are more susceptible to radi- ation damage; this
describes: correct answer Oxygen enhancement ratio
CT accounts for approximately what percent dose to the population (NCRP Report
#160)? correct answer 24%
Damage to the cell being irradiated is called: correct answer Somatic
Effective dose limits may be found in what published material? correct answer
NCRP reports
, Exposure times longer than ______ minutes can lead to skin effects. correct
answer 30
for a 22-year- The cumulative occupational exposure old radiographer is: correct
answer 220 mSv
Graphs that show the relationship between radiation received and the organism's
response are called: correct answer Dose-response curves
Highly reactive ions that have unpaired electrons in the outer shell are called:
correct answer Free radicals
If the air kerma measured 6 feet from the x-ray table is nO5 Graya, what is the air
kerma measured at a distance of 3 feet? correct answer 20 Graya
Increased dose equals increased probability of effects best describes which of the
following? correct answer Stochastic effects
Ionization may cause: correct answer Unstable atoms
Linear energy transfer: correct answer Varies for different types of radiation
Medical x-rays are an example of: correct answer Artificially produced radiation
Questions with Accurate Answers
1. Attenuation: correct answer Describes changes in the x ray beam as it travels
through the patient
According to NCRP Report #160, the increase in total exposure is primarily
attributed to increased use of: correct answer CT
Background radiation is the source of approximately what of human exposure?
percent correct answer 50%
Calipers are used to measure: correct answer thickness Patient part
Cell damage may be exhibited as: correct answer Loss of function or abnormal
function
Cells that are oxygenated are more susceptible to radi- ation damage; this
describes: correct answer Oxygen enhancement ratio
CT accounts for approximately what percent dose to the population (NCRP Report
#160)? correct answer 24%
Damage to the cell being irradiated is called: correct answer Somatic
Effective dose limits may be found in what published material? correct answer
NCRP reports
, Exposure times longer than ______ minutes can lead to skin effects. correct
answer 30
for a 22-year- The cumulative occupational exposure old radiographer is: correct
answer 220 mSv
Graphs that show the relationship between radiation received and the organism's
response are called: correct answer Dose-response curves
Highly reactive ions that have unpaired electrons in the outer shell are called:
correct answer Free radicals
If the air kerma measured 6 feet from the x-ray table is nO5 Graya, what is the air
kerma measured at a distance of 3 feet? correct answer 20 Graya
Increased dose equals increased probability of effects best describes which of the
following? correct answer Stochastic effects
Ionization may cause: correct answer Unstable atoms
Linear energy transfer: correct answer Varies for different types of radiation
Medical x-rays are an example of: correct answer Artificially produced radiation
