LRA 215 FINAL EXAM QUESTIONS
AND ANSWERS
Relative risk is___ - ANSWER-observed cases/expected cases
Low doses of radiation have been shown to cause _____. - ANSWER-chromosome
damage
Data showing radiation-induced human genetic abnormalities _____. - ANSWER-does
not exist
People who had radiation treatments to their thymus gland as children later showed
excess risk for _____. - ANSWER-thyroid cancer
A study of an irradiated population which showed a relative risk factor below 1.0 would
indicate that the population had a _____ risk. - ANSWER-reduced
Ankylosing spondylitis patients treated with radiation showed an increased incidence
of___ - ANSWER-leukemia
Radiation protection guidelines are based on _____. - ANSWER-stochastic effects of
radiation
____is a stochastic effect of radiation exposure - ANSWER-Cancer
People who were employed painting radium watch dials later showed excess risk for
_____ cancer. - ANSWER-Bone Cancer
Radiation induced leukemia has a latent period of ____years - ANSWER-4-7
An epidemiological study of the stochastic effects of very low doses of radiation requires
a population of _____ of people. - ANSWER-millions
The threshold dose for cataract formation is known to be____mSv of acute exposure of
the eyes - ANSWER-2
It is difficult to link cancer to radiation exposure because it occurs____in the population -
ANSWER-in high proportion
The human application of radioprotective agents would - ANSWER-Be fatally toxic
, The stem cells of the ovaries multiply during - ANSWER-Fetal Growth
As LET _____, the RBE _____. - ANSWER-increases, increases
Tissue is_____ radiosensitive under high oxygen conditions and ____ radiosensitive
under hypoxic conditions - ANSWER-more, less
Tissues that are _____ with a _____ metabolic rate are more radiosensitive. -
ANSWER-immature, high
If a response to radiation is expected, no matter how small the dose, then that dose-
response is _____. - ANSWER-nonthreshold
The human application of radioprotective agents would - ANSWER-be fatally toxic
The possible beneficial effect of a small amount of radiation is called _______ -
ANSWER-hormesis
A_____response to radiation is directly proportional to the dose received - ANSWER-
linear
Radiation induced genetic damage follows a____ dose-response relationship -
ANSWER-linear-nonthreshold
The RBE of diagnostic x-rays is equal to __ - ANSWER-1
Human cells cannot recover from radiation damage after there is___ - ANSWER-
interphase death
Studies of the effects of radiation show that low doses may____ - ANSWER-Stimulate
the immune system
Extend lifespan
Stimulate hormonal responses
A dose of 10Gy given to a patient in 5 doses of 2Gy per day is a ____dose - ANSWER-
fractionated dose
The LET of diagnostic x-ray is____keV/um. - ANSWER-3.0
_____is a measure of the rate that energy is transferred from ionizing radiation to soft
tissue - ANSWER-LET
Which dose response relationship can follow a sigmoid curve? - ANSWER-Nonlinear-
threshold
AND ANSWERS
Relative risk is___ - ANSWER-observed cases/expected cases
Low doses of radiation have been shown to cause _____. - ANSWER-chromosome
damage
Data showing radiation-induced human genetic abnormalities _____. - ANSWER-does
not exist
People who had radiation treatments to their thymus gland as children later showed
excess risk for _____. - ANSWER-thyroid cancer
A study of an irradiated population which showed a relative risk factor below 1.0 would
indicate that the population had a _____ risk. - ANSWER-reduced
Ankylosing spondylitis patients treated with radiation showed an increased incidence
of___ - ANSWER-leukemia
Radiation protection guidelines are based on _____. - ANSWER-stochastic effects of
radiation
____is a stochastic effect of radiation exposure - ANSWER-Cancer
People who were employed painting radium watch dials later showed excess risk for
_____ cancer. - ANSWER-Bone Cancer
Radiation induced leukemia has a latent period of ____years - ANSWER-4-7
An epidemiological study of the stochastic effects of very low doses of radiation requires
a population of _____ of people. - ANSWER-millions
The threshold dose for cataract formation is known to be____mSv of acute exposure of
the eyes - ANSWER-2
It is difficult to link cancer to radiation exposure because it occurs____in the population -
ANSWER-in high proportion
The human application of radioprotective agents would - ANSWER-Be fatally toxic
, The stem cells of the ovaries multiply during - ANSWER-Fetal Growth
As LET _____, the RBE _____. - ANSWER-increases, increases
Tissue is_____ radiosensitive under high oxygen conditions and ____ radiosensitive
under hypoxic conditions - ANSWER-more, less
Tissues that are _____ with a _____ metabolic rate are more radiosensitive. -
ANSWER-immature, high
If a response to radiation is expected, no matter how small the dose, then that dose-
response is _____. - ANSWER-nonthreshold
The human application of radioprotective agents would - ANSWER-be fatally toxic
The possible beneficial effect of a small amount of radiation is called _______ -
ANSWER-hormesis
A_____response to radiation is directly proportional to the dose received - ANSWER-
linear
Radiation induced genetic damage follows a____ dose-response relationship -
ANSWER-linear-nonthreshold
The RBE of diagnostic x-rays is equal to __ - ANSWER-1
Human cells cannot recover from radiation damage after there is___ - ANSWER-
interphase death
Studies of the effects of radiation show that low doses may____ - ANSWER-Stimulate
the immune system
Extend lifespan
Stimulate hormonal responses
A dose of 10Gy given to a patient in 5 doses of 2Gy per day is a ____dose - ANSWER-
fractionated dose
The LET of diagnostic x-ray is____keV/um. - ANSWER-3.0
_____is a measure of the rate that energy is transferred from ionizing radiation to soft
tissue - ANSWER-LET
Which dose response relationship can follow a sigmoid curve? - ANSWER-Nonlinear-
threshold
