1|Page
FINAL LRA 215 (ACTUAL 2025/2026) QUESTIONS
AND VERIFIED ANSWERS | ALREADY PASSED
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
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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
Fractionation and protraction are used for radiation therapy because they allow
the patient to____ - ...(answer)..Recover between doses
FINAL LRA 215 (ACTUAL 2025/2026) QUESTIONS
AND VERIFIED ANSWERS | ALREADY PASSED
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
, 2|Page
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
Fractionation and protraction are used for radiation therapy because they allow
the patient to____ - ...(answer)..Recover between doses
