Safety

Question 1

Minimum source-to-skin distance for mobile radiography must be:

Answer 1

Never

Question 2

Added tube filtration should be adjusted by the radiographer

Answer 2

12 inches

Question 3

A readout on the fluoroscopic monitor that indicates air kerma striking the surface of the patient is:

Answer 3

DAP meter

Question 4

The lowest intensity of scatter radiation from the patient is located:

Answer 4

At a 90-degree angle from the patient

Question 5

Lead aprons used in fluoroscopy must be at least:

Answer 5

0.25-mm lead equivalent

Question 6

The most effective protection against radiation exposure for the radiographer is:

Answer 6

Distance

Question 7

Which of the following is used to represent the mean marrow dose?

Answer 7

MMD

Question 8

Which of the following may be used for 3 months at a time?

Answer 8

TLD

Question 9

Which of the following is accurate as low as 50 μGya and must be sent via mail for the readout?

Answer 9

TLD

Question 10

Which of the following provides for instant readout of an individual’s exposure?

Answer 10

Digital ionization dosimeter

Question 11

Which of the following sets of exposure factors would result in the lowest dose to the patient?

Answer 11

Digital ionization dosimeter

Question 12

Which of the following sets of exposure factors would result in the lowest dose to the patient?

Answer 12

Low mAs, high kVp

Question 13

Which of the following is considered a late tissue effect?

Answer 13

Cataractogenesis

Question 14

Compared with ova in younger and older women, ova in women of reproductive age are:

Answer 14

Less radiosensitive

Question 15

The most radiosensitive cells in the body are:

Answer 15

Lymphocytes

Question 16

The law that states that cells are most sensitive to radiation when they are nonspecialized and rapidly dividing is the:

Answer 16

Law of Bergonié and Tribondeau

Question 17

Most of the damage to a cell occurs as a result of:

Answer 17

Indirect effect

Question 18

Which of the following is responsible for producing free radicals?

Answer 18

Indirect effect

Question 19

What occurs when radiation transfers its energy to the cellular cytoplasm?

Answer 19

Indirect effect

Question 20

Which of the following states that each cell has a master molecule that directs all cellular activities and that, if inactivated, results in cellular death?

Answer 20

Target theory

Question 21

The phases of the cellular life cycle, in order, are:

Answer 21

Interphase (G1, S, G2), prophase, metaphase, anaphase, telophase

Question 22

According to NCRP Report #116, what is the annual effective occupational dose limit for the lens of the eye?

Answer 22

150 mSv

Question 23

According to NCRP Report #116, what is the annual effective dose limit for the general public, assuming infrequent exposure?

Answer 23

5 mSv

Question 24

According to NCRP Report #116, the occupational cumulative effective dose limit = age in years × what dose?

Answer 24

10 mSv

Question 25

Effects of radiation where the probability of occurrence, not severity of occurrence, is proportional to the dose are called:

Answer 25

Stochastic effects

Question 26

Which of the following means there is no safe level of radiation and the response to the radiation is not directly proportional to the dose received?

Answer 26

Nonlinear-nonthreshold effect

Question 27

Effective dose limit is defined as the upper boundary dose that:

Answer 27

Can be absorbed, either in a single exposure or annually, with a negligible risk of somatic or genetic damage to the individual

Question 28

Which of the following primarily involves loosely bound outer-shell electrons?

Answer 28

Compton interaction

Question 29

Which of the following involves interaction between an incident photon and an atomic nucleus?

Answer 29

 Pair production

Question 30

Cosmic radiation:

Answer 30

Is a part of natural background exposure