Ch. 3 Safety Quiz

Question 1

Natural background radiation represents what percentage of humans’ annual radiation exposure?

Answer 1

50%

Question 2

Cosmic radiation

Answer 2

Is a part of natural background exposure

Question 3

X-rays and gamma rays used in diagnostic imaging are

Answer 3

Part of an artificial background radiation dose

Question 4

A feature of fluoroscopic x-ray machines that automatically adjusts kVp and mA to maintain image brightness for necessary image quality is called

Answer 4

Automatic brightness control (ABC)

Question 5

What term best describes the approximate skin dose where the x-ray beam is entering the patient?

Answer 5

Air kerma

Question 6

Which of the following is also known as coherent scattering?

Answer 6

Classical scatter

Question 7

Which of the following photon–tissue interactions do not occur in diagnostic radiography?

Answer 7

Pair Production

Question 8

Which of the following produces scatter radiation that exits the patient and may fog the image?

Answer 8

Coherent scatter

Question 9

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

Answer 9

Compton interaction

Question 10

Which of the following results in the production of a photoelectron that is ejected from the atom?

Answer 10

Photoelectric interaction

Question 11

Which of the following interactions may result in occupational exposure for a radiographer?

Answer 11

Compton interaction

Question 12

What agency publishes radiation protection standards based on scientific research?

Answer 12

National Council on Radiation Protection and Measurements (NCRP)

Question 13

Effective dose limit is defined as the upper boundary dose that

Answer 13

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

Question 14

ALARA is an acronym for

Answer 14

A radiation protection concept that encourages radiation users to keep the dose to the patient as low as reasonably achievable

Question 15

Which of the following means there is a safe level of radiation for certain effects and those effects are not directly proportional to the dose received when the safe level is exceeded?

Answer 15

Nonlinear-threshold effect

Question 16

Effects of radiation that become more severe as dose increases are called

Answer 16

Deterministic effects

Question 17

The process of cell division for germ cells is called

Answer 17

Meiosis

Question 18

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

Answer 18

Law of Bergonié and Tribondeau

Question 19

What is the name for changes in genetic code passed on to the next generation?

Answer 19

Mutations

Question 20

Cells are more radiosensitive when

Answer 20

Fully oxygenated

Question 21

The most radiosensitive cells in the body are

Answer 21

Lymphocytes

Question 22

Cells that are least sensitive to radiation exposure include

Answer 22

Nerve and muscle cells

Question 23

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

Answer 23

Low mAs, high kVp

Question 24

Which of the following is used as part of an effort to practice the ALARA concept?

Answer 24

Collimation

Question 25

The cardinal rules of radiation protection include

Answer 25

Shielding, distance, time

Question 26

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

Answer 26

TLD

Question 27

Which of the following represents the practice of keeping radiation dose low?

Answer 27

ALARA

Question 28

The timer used in fluoroscopy

Answer 28

Is used to alert the fluoroscopist after 5 minutes of fluoroscopy scanning have elapsed

Question 29

The most effective protection against radiation exposure for the radiographer is

Answer 29

Distance

Question 30

Which of the following is true concerning holding of patients for radiographic exams?

Answer 30

Should be done only when absolutely necessary, and then the holding should be done by a nonpregnant member of the patient’s family