RADT 251 Final Review Exam Questions
with Latest Update
Define Late somatic effects - Answer-Biological effects that manifest months or years
after exposure
Define Early somatic effects - Answer-Biological effects that manifest within minutes,
hours, days after exposure
Define stochastic - Answer-Probability of occurrence is proportional to dose
Define non-stochastic - Answer-As dose increases, so dose severity
Match the following quantities to their units
Absorbed dose
Equivalent dose
Exposure - Answer-AD - Gray
EqD - Sievert
X - Coulombs per kilogram
When TLD's are heated, what type of energy is released to indicate dose? - Answer-
Visible light
What is the quality factor for x-rays? - Answer-1
What radiation quantity takes into account both the effect of the type of radiation used &
sensitivity of the organ irradiated through use of appropriate weighting factor? - Answer-
Effective dose
T/F
It is not possible to repair radiation damage & recover. - Answer-False
T/F
As the intensity of x-ray exposure of an air volume increases, the number of electron-ion
pairs produced decreases. - Answer-False
T/F
The lower the atomic number of a material, the more x-rays it absorbs. - Answer-False
T/F
EfD can be expressed in Sv or mSv. - Answer-True
T/F
Personnel dosimeters protect the wearer from exposure. - Answer-False
, T/F
Wearing a personnel dosimeter in a consistent location is the responsibility of the
individual wearing the device. - Answer-True
T/F
A disadvantage of the OSL dosimeter is that occupational exposure cannot be
established on the day of occurrence. - Answer-True
T/F
All radiation survey meters are equally sensitive to the detection of ionizing radiation. -
Answer-False
T/F
A lack of standard unit of measure was an early difficulty in attempts to reduce
exposure. - Answer-True
What is the primary difference between survey instruments & personnel dosimetry
devices? - Answer-Survey instruments detect the presence or absence of radiation in
an area.
Define effective dose limiting system. - Answer-A set of numeric dose limits that are
based on calculations of the various risks of cancer & genetic to tissues or organs
exposure to radiation
Exposure is measured in an OSL by? - Answer-Passing a laser light over the aluminum
oxide detectors & then measuring the light emitted, which would be proportional to the
amount of exposure
Define Tolerance dose - Answer-A dose to which occupationally exposed persons could
be continuously subjected w/o any apparent harmful acute effects
Interactions between higher energy photons & outer shell electrons of tissue atoms
result in? - Answer-Compton
Radiation survey instruments measure which of the following:
1. Total quantity of electrical charge resulting from ionization of the gas
2. Rate at which electrical charge is produced
3. Luminescence - Answer-1 and 2 only
Somatic effects from exposure to ionizing radiation is best described as? - Answer-
Damage to the exposed individual that includes both short & long term effects
The EfD is based on? - Answer-Energy deposited in biologic tissue by ionizing radiation
The ability of a substance to absorb radiation depends on? - Answer-Atomic number
with Latest Update
Define Late somatic effects - Answer-Biological effects that manifest months or years
after exposure
Define Early somatic effects - Answer-Biological effects that manifest within minutes,
hours, days after exposure
Define stochastic - Answer-Probability of occurrence is proportional to dose
Define non-stochastic - Answer-As dose increases, so dose severity
Match the following quantities to their units
Absorbed dose
Equivalent dose
Exposure - Answer-AD - Gray
EqD - Sievert
X - Coulombs per kilogram
When TLD's are heated, what type of energy is released to indicate dose? - Answer-
Visible light
What is the quality factor for x-rays? - Answer-1
What radiation quantity takes into account both the effect of the type of radiation used &
sensitivity of the organ irradiated through use of appropriate weighting factor? - Answer-
Effective dose
T/F
It is not possible to repair radiation damage & recover. - Answer-False
T/F
As the intensity of x-ray exposure of an air volume increases, the number of electron-ion
pairs produced decreases. - Answer-False
T/F
The lower the atomic number of a material, the more x-rays it absorbs. - Answer-False
T/F
EfD can be expressed in Sv or mSv. - Answer-True
T/F
Personnel dosimeters protect the wearer from exposure. - Answer-False
, T/F
Wearing a personnel dosimeter in a consistent location is the responsibility of the
individual wearing the device. - Answer-True
T/F
A disadvantage of the OSL dosimeter is that occupational exposure cannot be
established on the day of occurrence. - Answer-True
T/F
All radiation survey meters are equally sensitive to the detection of ionizing radiation. -
Answer-False
T/F
A lack of standard unit of measure was an early difficulty in attempts to reduce
exposure. - Answer-True
What is the primary difference between survey instruments & personnel dosimetry
devices? - Answer-Survey instruments detect the presence or absence of radiation in
an area.
Define effective dose limiting system. - Answer-A set of numeric dose limits that are
based on calculations of the various risks of cancer & genetic to tissues or organs
exposure to radiation
Exposure is measured in an OSL by? - Answer-Passing a laser light over the aluminum
oxide detectors & then measuring the light emitted, which would be proportional to the
amount of exposure
Define Tolerance dose - Answer-A dose to which occupationally exposed persons could
be continuously subjected w/o any apparent harmful acute effects
Interactions between higher energy photons & outer shell electrons of tissue atoms
result in? - Answer-Compton
Radiation survey instruments measure which of the following:
1. Total quantity of electrical charge resulting from ionization of the gas
2. Rate at which electrical charge is produced
3. Luminescence - Answer-1 and 2 only
Somatic effects from exposure to ionizing radiation is best described as? - Answer-
Damage to the exposed individual that includes both short & long term effects
The EfD is based on? - Answer-Energy deposited in biologic tissue by ionizing radiation
The ability of a substance to absorb radiation depends on? - Answer-Atomic number
