This atomic bond forms when one when electrons are donated by one atom to another (bound by the
attraction between oppositely-charged ions)
a. covalent bond
b. ionic bond
c. cohesive bond
d. hydrogen bond - Correct Answer B
This atomic bond forms when two atoms share a pair of electrons
a. covalent bond
b. ionic bond
c. cohesive bond
d. hydrogen bond - Correct Answer A
This type of energy transfer is described as the average energy deposited per unit path length of in soft
tissue (keV/um)
a. LET
b. oxygen effect
c. RIB
d. RBE - Correct Answer A
T or F
As LET increases the ability of radiation to produce biological damage increases. It is directly
proportional. - Correct Answer True
,The presence or absence of molecular oxygen within a cell influences the biological effect of radiation is
called
a. Target theory
b. LET
c. RBE
d. Oxygen effect - Correct Answer D
T or F
Oxygen is a radiosensitizer - Correct Answer True
T or F
Well oxygenated cells have a much steeper survival curve - Correct Answer True
The ratio in cell kill between oxygenated and deoxygenated cells is called the
a. Oxygen effect
b. Oxygen enhancement ratio
c. LET - Correct Answer B
If 10 Gy of 60Co gamma rays kills 50% of the mice in a group, and 1 Gy of heavy ion radiotherapy kills
the other group, the RBE would be:
a. 10
b. 100
c. 10^8
,d. 1000 - Correct Answer A
T or F
As LET increases RBE decreases. - Correct Answer False
Dose from an amount of a test radiation to produce the same biological effect is called
a. LET
b. RBE
c. oxygen enhancement ratio
d. oxygen effect - Correct Answer B
RBE is dependent on which of the following:
1 -Type of radiation
2-LET
3 -Type of cell or tissue
4 -Biological effect level
5. -Dose level/Dose rate
a. 1 and 2 only
b. 1 and 5
c. 4 only
d. all of the above - Correct Answer D
Which of the following occurs when the incident photon interacts with a nearby nucleus creating an
electron positive pair:
, a. Pair production
b. Compton scatter
c. photoelectric effect - Correct Answer A
If 150 mGy of neutrons produced the same amount of cell death as 650 mGy of 250 kVp x-rays, calculate
the RBE:
a. 4.3
b. 1.1
c. .6
d. 3.4 - Correct Answer A
This is the ratio of the dose of some reference radiation required to produce a certain amount of
damage to the dose of test radiation required to produce the same amount of damage.
a. LET
b. RBE
c. oxygen enhancement ratio
d. oxygen effect - Correct Answer B
In photoelectric effect, the photon is
a. scattered and the atom is excited
b. absorbed and the atom is excited
c. absorbed and the atom is ionized
d. scattered and the atom is ionized - Correct Answer C
Pair production requres the incident photons with energies greater than 1 meV because
attraction between oppositely-charged ions)
a. covalent bond
b. ionic bond
c. cohesive bond
d. hydrogen bond - Correct Answer B
This atomic bond forms when two atoms share a pair of electrons
a. covalent bond
b. ionic bond
c. cohesive bond
d. hydrogen bond - Correct Answer A
This type of energy transfer is described as the average energy deposited per unit path length of in soft
tissue (keV/um)
a. LET
b. oxygen effect
c. RIB
d. RBE - Correct Answer A
T or F
As LET increases the ability of radiation to produce biological damage increases. It is directly
proportional. - Correct Answer True
,The presence or absence of molecular oxygen within a cell influences the biological effect of radiation is
called
a. Target theory
b. LET
c. RBE
d. Oxygen effect - Correct Answer D
T or F
Oxygen is a radiosensitizer - Correct Answer True
T or F
Well oxygenated cells have a much steeper survival curve - Correct Answer True
The ratio in cell kill between oxygenated and deoxygenated cells is called the
a. Oxygen effect
b. Oxygen enhancement ratio
c. LET - Correct Answer B
If 10 Gy of 60Co gamma rays kills 50% of the mice in a group, and 1 Gy of heavy ion radiotherapy kills
the other group, the RBE would be:
a. 10
b. 100
c. 10^8
,d. 1000 - Correct Answer A
T or F
As LET increases RBE decreases. - Correct Answer False
Dose from an amount of a test radiation to produce the same biological effect is called
a. LET
b. RBE
c. oxygen enhancement ratio
d. oxygen effect - Correct Answer B
RBE is dependent on which of the following:
1 -Type of radiation
2-LET
3 -Type of cell or tissue
4 -Biological effect level
5. -Dose level/Dose rate
a. 1 and 2 only
b. 1 and 5
c. 4 only
d. all of the above - Correct Answer D
Which of the following occurs when the incident photon interacts with a nearby nucleus creating an
electron positive pair:
, a. Pair production
b. Compton scatter
c. photoelectric effect - Correct Answer A
If 150 mGy of neutrons produced the same amount of cell death as 650 mGy of 250 kVp x-rays, calculate
the RBE:
a. 4.3
b. 1.1
c. .6
d. 3.4 - Correct Answer A
This is the ratio of the dose of some reference radiation required to produce a certain amount of
damage to the dose of test radiation required to produce the same amount of damage.
a. LET
b. RBE
c. oxygen enhancement ratio
d. oxygen effect - Correct Answer B
In photoelectric effect, the photon is
a. scattered and the atom is excited
b. absorbed and the atom is excited
c. absorbed and the atom is ionized
d. scattered and the atom is ionized - Correct Answer C
Pair production requres the incident photons with energies greater than 1 meV because
