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Radiation Protection Chapter 7 Exam
Questions With Correct Answers 100%
Verified.
For radiation protection, high-LET radiation is of greatest concern when a radionuclide has been
implanted, ingested, injected, or inhaled because:
a) Only single-strand breaks in DNA are possible
b) The potential exists for reparable damage of single-strand breaks in DNA
c) The potential exists for irreparable damage because multiple-strand breaks in DNA are
possible
d) The potential exists fro reparable damage in DNA resulting from multiple-strand breaks -
Answer✔C) The potential exists for irreparable damage because multiple-strand breaks in DNA
are possible
Free radicals behave as an extremely reactive single entity as a result of the presence of:
a) Paired electrons
b) Unpaired electrons
c) Paired neutrons and protons
d) Unpaired neutrons and protons - Answer✔b) Unpaired electrons
Which of the following are classified as high-LET radiation?
1. Alpha particles
2. Gamma rays
3. X-rays
a) 1 only
b) 2 only
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
c) 3 only
d) 1,2,3 - Answer✔a) alpha particles
A biologic reaction is produced by 3 Gy, of a test radiation. It takes 12 Gy, of 250-kVp x-
radiation to produce the same biologic reaction. What is the relative biologic effectiveness
(RBE) of the test radiation?
a) 2.5
b) 3
c) 4
d) 8 - Answer✔c) 4
Which action of ionizing radiation is most harmful to the human body?
a) Direct action
b) Indirect action
c) Epidemiologic action
d) Mitotic action - Answer✔b) Indirect action
Which molecules in the human body are most commonly directly acted on by ionizing radiation
to produce molecular damage through an indirect action?
a) Protein
b) Carbohydrate
c) Fat
d) Water - Answer✔D) water
When does ionizing radiation cause complete chromosome breakage?
a) When a single strand of the sugar-phosphate chain sustains a direct hit
b) When two direct hits occur in the same rung of the DNA macromolecule
c) When two direct hits occur in different rungs of the DNA macromolecule
d) When two direct hits are sustained at opposite ends of the DNA macromolecule - Answer✔B)
When two direct hits occur in the same rung of the DNA macromolecule
When significant numbers of lymphocytes are damaged by exposure from ionizing radiation,
the body:
2
Radiation Protection Chapter 7 Exam
Questions With Correct Answers 100%
Verified.
For radiation protection, high-LET radiation is of greatest concern when a radionuclide has been
implanted, ingested, injected, or inhaled because:
a) Only single-strand breaks in DNA are possible
b) The potential exists for reparable damage of single-strand breaks in DNA
c) The potential exists for irreparable damage because multiple-strand breaks in DNA are
possible
d) The potential exists fro reparable damage in DNA resulting from multiple-strand breaks -
Answer✔C) The potential exists for irreparable damage because multiple-strand breaks in DNA
are possible
Free radicals behave as an extremely reactive single entity as a result of the presence of:
a) Paired electrons
b) Unpaired electrons
c) Paired neutrons and protons
d) Unpaired neutrons and protons - Answer✔b) Unpaired electrons
Which of the following are classified as high-LET radiation?
1. Alpha particles
2. Gamma rays
3. X-rays
a) 1 only
b) 2 only
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
c) 3 only
d) 1,2,3 - Answer✔a) alpha particles
A biologic reaction is produced by 3 Gy, of a test radiation. It takes 12 Gy, of 250-kVp x-
radiation to produce the same biologic reaction. What is the relative biologic effectiveness
(RBE) of the test radiation?
a) 2.5
b) 3
c) 4
d) 8 - Answer✔c) 4
Which action of ionizing radiation is most harmful to the human body?
a) Direct action
b) Indirect action
c) Epidemiologic action
d) Mitotic action - Answer✔b) Indirect action
Which molecules in the human body are most commonly directly acted on by ionizing radiation
to produce molecular damage through an indirect action?
a) Protein
b) Carbohydrate
c) Fat
d) Water - Answer✔D) water
When does ionizing radiation cause complete chromosome breakage?
a) When a single strand of the sugar-phosphate chain sustains a direct hit
b) When two direct hits occur in the same rung of the DNA macromolecule
c) When two direct hits occur in different rungs of the DNA macromolecule
d) When two direct hits are sustained at opposite ends of the DNA macromolecule - Answer✔B)
When two direct hits occur in the same rung of the DNA macromolecule
When significant numbers of lymphocytes are damaged by exposure from ionizing radiation,
the body:
2
