Final LRA 215 Exam Questions and
Answers7
As LET _____, the RBE _____. - ANSWERS-increases, increases
Tissue is_____ radiosensitive under high oxygen conditions and ____ radiosensitive under
hypoxic conditions - ANSWERS-more, less
Tissues that are _____ with a _____ metabolic rate are more radiosensitive. - ANSWERS-
immature, high
If a response to radiation is expected, no matter how small the dose, then that dose-response is
_____. - ANSWERS-nonthreshold
The human application of radioprotective agents would - ANSWERS-be fatally toxic
The possible beneficial effect of a small amount of radiation is called _______ - ANSWERS-
hormesis
A_____response to radiation is directly proportional to the dose received - ANSWERS-linear
Radiation induced genetic damage follows a____ dose-response relationship - ANSWERS-linear-
nonthreshold
The RBE of diagnostic x-rays is equal to __ - ANSWERS-1
, Human cells cannot recover from radiation damage after there is___ - ANSWERS-interphase
death
Studies of the effects of radiation show that low doses may____ - ANSWERS-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 - ANSWERS-
fractionated dose
The LET of diagnostic x-ray is____keV/um. - ANSWERS-3.0
_____is a measure of the rate that energy is transferred from ionizing radiation to soft tissue -
ANSWERS-LET
Which dose response relationship can follow a sigmoid curve? - ANSWERS-Nonlinear-threshold
Fractionation and protraction are used for radiation therapy because they allow the patient
to____ - ANSWERS-Recover between doses
Have higher total doses
Repair damaged tissues
The human dose-response relationship at low ranges of radiation is calculated using____ -
ANSWERS-Extrapolation form high ranges
A protracted dose of radiation is given______ - ANSWERS-over a long period of time
Answers7
As LET _____, the RBE _____. - ANSWERS-increases, increases
Tissue is_____ radiosensitive under high oxygen conditions and ____ radiosensitive under
hypoxic conditions - ANSWERS-more, less
Tissues that are _____ with a _____ metabolic rate are more radiosensitive. - ANSWERS-
immature, high
If a response to radiation is expected, no matter how small the dose, then that dose-response is
_____. - ANSWERS-nonthreshold
The human application of radioprotective agents would - ANSWERS-be fatally toxic
The possible beneficial effect of a small amount of radiation is called _______ - ANSWERS-
hormesis
A_____response to radiation is directly proportional to the dose received - ANSWERS-linear
Radiation induced genetic damage follows a____ dose-response relationship - ANSWERS-linear-
nonthreshold
The RBE of diagnostic x-rays is equal to __ - ANSWERS-1
, Human cells cannot recover from radiation damage after there is___ - ANSWERS-interphase
death
Studies of the effects of radiation show that low doses may____ - ANSWERS-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 - ANSWERS-
fractionated dose
The LET of diagnostic x-ray is____keV/um. - ANSWERS-3.0
_____is a measure of the rate that energy is transferred from ionizing radiation to soft tissue -
ANSWERS-LET
Which dose response relationship can follow a sigmoid curve? - ANSWERS-Nonlinear-threshold
Fractionation and protraction are used for radiation therapy because they allow the patient
to____ - ANSWERS-Recover between doses
Have higher total doses
Repair damaged tissues
The human dose-response relationship at low ranges of radiation is calculated using____ -
ANSWERS-Extrapolation form high ranges
A protracted dose of radiation is given______ - ANSWERS-over a long period of time
