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WorksheetsUnit 1 RADBIO Ch1-3
Total questions: 37
Worksheet time: 19mins
The x-ray photon energy required to initiate pair production is
0.511 MeV.
0.511 keV
1.022 keV.
1.022 MeV.
Consequences of ionization in human cells include
1. creation of stable atoms.
2. production of free electrons.
3. creation of highly reactive free radicals capable of producing substances poisonous to the cell.
4. creation of new biologic molecules detrimental to the living cell.
5. injury to the cell that may manifest itself as a normal function or loss of function.
1,2,3,4&5
2,3&4
3,4&5
1,3,&5
Diagnostic efficacy includes
1. determining if an imaging procedure is justified.
2. obtaining images with no radiation exposure.
3. adhering to radiation safety guidelines.
4. revealing the presence or absence of disease in a patient.
1,3 and 4
1,2 and 3
2,3, and 4
1 and 3
If a patient asks a radiographer a question about how much radiation he or she will receive from a specific x-ray procedure, the radiographer can
tell the patient that it is unethical to discuss such concerns.
respond by using an estimation based on the comparison of radiation received from the x-ray to natural background radiation received.
avoid the patient’s question by changing the subject.
refuse to answer the question and recommend that he or she speak with the referring physician.
In a hospital setting, which of the following professionals is expressly charged by the hospital administration with being directly responsible for the execution, enforcement, and maintenance of the ALARA program?
Chief of staff
Assistant administrator of the facility
Radiation Safety Officer
Student radiologic technologist
The ALARA principle provides a method for comparing the amount of radiation used in various health care facilities in a particular area for specific imaging procedures. This information may be helpful to many
regulatory agencies.
accrediting bodies.
advisory groups.
radiation standards organizations.
The millisievert (mSv) is equal to
1/100 of a sievert.
1/10 of a sievert.
1/1000 of a sievert.
1/10,000 of a sievert.
The term as low as reasonably achievable (ALARA) is synonymous with the term
equivalent dose (EqD).
background equivalent radiation time (BERT).
diagnostic efficacy.
optimization for radiation protection (ORP).
What unit is used to measure radiation exposure in the metric International System of Units?
Milligray
Coulomb per kilogram
Millisievert
Sievert
Which of the following is a method of explaining radiation to the public?
BERT
ALARA
ORP
NEXT
Which of the following radiation quantities is intended to be the best overall measure of the biologic effects of ionizing radiation?
Effective dose
Exposure
Absorbed dose
There is no radiation quantity that is intended to be the best overall measure of the biologic effects of ionizing radiation
Convert 2 Sv into mSv
2000
20
.20
200
Convert 250 Sv into mSv
2500
250,000
250
25,000
What is the SI unit for exposure?
C/kg (Coulomb per kilogram)
mR (milliroentgen)
mGy(milligray)
mRem (millirem)
What is the traditional unit for absorbed dose?
mRad (millirad)
mGy (milligray)
mRem (millirem)
mR (milliroentgen)
What is the SI unit for Effective Dose
mRem
mSv
mRad
mGy
When a technical exposure factor of 100 kVp is selected, which of the following occurs?
The beam will contain photons having energies of 100 keV or less, with an average effective energy of approximately 33 keV.
The beam will contain all photons having an effective energy of 100 keV.
The electrons will be accelerated from the cathode to the anode with an average effective energy of 33 keV.
The electrons will be accelerated from the anode to the cathode with an average effective energy of 33 keV.
Annihilation radiation is used in which of the following modalities?
Positron emission tomography
Digital mammography
Computed tomography
Computed radiography
The symbol Z indicates
atomic number of an atom.
atomic weight of an atom.
fluorescent yield.
the number of vacancies in an atomic shell.
Which of the following terms are synonymous?
1. Coherent scattering
2. Classical scattering
3. Unmodified scattering
1 and 3 only
1 and 2 only
2 and 3 only
1, 2, and 3
Most scattered radiation produced during radiographic procedures is the direct result of which of the following?
Photoelectric absorption
Nuclear decay
Compton interactions
Image-formation electrons
Compton scattering is synonymous with
incoherent scattering.
coherent scattering.
photoelectric absorption.
photodisintegration.
In photodisintegration interaction, the incident photon:
interacts with the outer shell electron of the atom
interacts with the innermost shell of atom
collides with nucleus of atom and releases a neutron
interacts with nucleus and produces a particle and negatron
Ionization of the atom occurs during process of coherent scattering.
true
false
Pair production occurs only at ______ or greater.
0.102 MeV
1.022 MeV
102.2 MeV
1022 MeV
Radiation photons emitted from the x-ray tube but not yet reached or penetrated the patient:
primary photons
exit radiation
image formation photons
scatter radiation
The traditional unit of Exposure (X) is:
Roentgen
C/kg
REM
rad
The unit that used to describe Absorbed Dose is ___________.
REM
Sv
Roentgen
gray
What instrument can be used to read Exposure (X)?
Amp meter
Coulomb counter
Standard, or free-air, ionization chamber
Ohmmeter
Which of the following is not a term for coherent scattering?
Characteristic
Classical
Elastic
Unmodified
Which of the following results in all-directional scatter?
Classical interaction
Coherent interaction
Compton interaction
Which of the following units of measure are not SI units?
1. Roentgens
2. Coulombs per kilogram, Grays, Sieverts
3. Rads and Rems
1 and 3
2 and 3
2 only
1 only
In photodisintegration interaction, the incident photon:
interacts with the outer shell electron of the atom
interacts with the innermost shell of atom
collides with nucleus of atom and releases a neutron
interacts with nucleus and produces a particle and negatron
The unit that used to describe Absorbed Dose is ___________.
REM
Sv
Roentgen
gray
A photoelectron usually is absorbed within a few micrometers of the medium through which it travels, thereby increasing patient dose and contributing to biologic damage in tissue.
T
F
Absorption properties of different body structures must be identical to make diagnostically useful images possible.
T
F
The intensity of radiation scatter in various directions is a major factor in the planning of protection for medical imaging personnel during a radiologic examination.
T
F
