Question 1

Which of the following modifications in technique will reduce patient exposure to radiation during dental radiographic procedures?

Accepted Answer

A)   Use of D-speed rather than F-speed film
B)   Round rather than rectangular collimation
C)   A longer source-to-film distance
D)   A lower kilovoltage peak

Question 2

____ refers to the quantity of radiation received or the total amount of radiation energy absorbed.

Accepted Answer

A)   Total dose
B)   Dose rate
C)   Amount of tissue irradiated
D)   Cell sensitivity

Question 3

Cellular injuries following the latent period may include (1)  cell death, (2)  cessation of mitotic activity, and/or (3)  abnormal mitotic activity.

Accepted Answer

A)   1, 2, 3
B)   1, 2
C)   1, 3
D)   1 only

Question 4

The traditional unit of dose is called:

Accepted Answer

A)   The roentgen (R) 
B)   The radiation absorbed dose (rad) 
C)   The roentgen equivalent in man (rem) 
D)   The gray (Gy)

Question 5

Which of the following is considered a short-term effect of radiation exposure?

Accepted Answer

A)   Genetic defects
B)   Birth abnormalities
C)   Hair loss
D)   Cancer

Question 6

Which types of cells are more sensitive to radiation: (1)  rapidly dividing, (2)  slowly dividing, (3)  young, and/or (4)  old?

Accepted Answer

A)   1 and 3
B)   1 and 4
C)   2 and 3
D)   2 and 4

Question 7

The potential risk of dental radiography inducing a fatal cancer in an individual is about ____ the risk of a person developing cancer spontaneously.

Accepted Answer

A)   1/10
B)   1/100
C)   1/1000
D)   1/1,000,000

Question 8

Which of the following statements is/are true of the average dose of background radiation received by an individual in the United States?

Accepted Answer

A)   The average dose ranges from 150 to 300 millirads.
B)   Geographic areas at higher elevations are associated with increased amounts of cosmic radiation.
C)   Geographic areas that contain more radioactive materials are associated with increased amounts of cosmic radiation.
D)   Both a and b.

Question 9

A nonthreshold dose-response curve suggests that:

Accepted Answer

A)   Below a threshold amount of radiation, no biologic damage occurs.
B)   Below a threshold amount of radiation, a safe amount of biologic damage occurs.
C)   Above a threshold amount of radiation, some biologic damage occurs.
D)   No matter how small the amount of radiation received, some biologic damage occurs.

Question 10

Risk estimates suggest (1)  that death is more likely to occur from common activities than from dental radiographic procedures, and (2)  that cancer is much more likely to be unrelated to radiation exposure.

Accepted Answer

A)   Both statements are true.
B)   Both statements are false.
C)   The first statement is true; the second statement is false.
D)   The first statement is false; the second statement is true.

Question 11

The SI equivalent of the rem is:

Accepted Answer

A)   The rad.
B)   The gray.
C)   The sievert.
D)   The roentgen.

Question 12

1)  More radiation damage takes place with high dose rates, 2)  because a rapid delivery of radiation does not allow time for cellular damage to be repaired.

Accepted Answer

A)   Both statements are true.
B)   Both statements are false.
C)   The first statement is true; the second statement is false.
D)   The first statement is false; the second statement is true.

Exam 4: Radiation Biology

Which types of cells are more sensitive to radiation: (1) rapidly dividing, (2) slowly dividing, (3) young, and/or (4) old?

Correct Answer
verified

Cellular injuries following the latent period may include (1) cell death, (2) cessation of mitotic activity, and/or (3) abnormal mitotic activity.

Correct Answer
verified

The SI equivalent of the rem is:

Correct Answer
verified

Which of the following modifications in technique will reduce patient exposure to radiation during dental radiographic procedures?

Correct Answer
verified

The potential risk of dental radiography inducing a fatal cancer in an individual is about ____ the risk of a person developing cancer spontaneously.

Correct Answer
verified

Which of the following statements is/are true of the average dose of background radiation received by an individual in the United States?

Correct Answer
verified

Which of the following is considered a short-term effect of radiation exposure?

Correct Answer
verified

Risk estimates suggest (1) that death is more likely to occur from common activities than from dental radiographic procedures, and (2) that cancer is much more likely to be unrelated to radiation exposure.

Correct Answer
verified

1) More radiation damage takes place with high dose rates, 2) because a rapid delivery of radiation does not allow time for cellular damage to be repaired.

Correct Answer
verified

____ refers to the quantity of radiation received or the total amount of radiation energy absorbed.

Correct Answer
verified

A nonthreshold dose-response curve suggests that:

Correct Answer
verified

The traditional unit of dose is called:

Correct Answer
verified

Exam 4: Radiation Biology

Which types of cells are more sensitive to radiation: (1) rapidly dividing, (2) slowly dividing, (3) young, and/or (4) old?

Correct AnswerverifiedShow Answer

Cellular injuries following the latent period may include (1) cell death, (2) cessation of mitotic activity, and/or (3) abnormal mitotic activity.

Correct AnswerverifiedShow Answer

The SI equivalent of the rem is:

Correct AnswerverifiedShow Answer

Which of the following modifications in technique will reduce patient exposure to radiation during dental radiographic procedures?

Correct AnswerverifiedShow Answer

The potential risk of dental radiography inducing a fatal cancer in an individual is about ____ the risk of a person developing cancer spontaneously.

Correct AnswerverifiedShow Answer

Which of the following statements is/are true of the average dose of background radiation received by an individual in the United States?

Correct AnswerverifiedShow Answer

Which of the following is considered a short-term effect of radiation exposure?

Correct AnswerverifiedShow Answer

Risk estimates suggest (1) that death is more likely to occur from common activities than from dental radiographic procedures, and (2) that cancer is much more likely to be unrelated to radiation exposure.

Correct AnswerverifiedShow Answer

1) More radiation damage takes place with high dose rates, 2) because a rapid delivery of radiation does not allow time for cellular damage to be repaired.

Correct AnswerverifiedShow Answer

____ refers to the quantity of radiation received or the total amount of radiation energy absorbed.

Correct AnswerverifiedShow Answer

A nonthreshold dose-response curve suggests that:

Correct AnswerverifiedShow Answer

The traditional unit of dose is called:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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