October 2014 Flashcards Preview

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Flashcards in October 2014 Deck (30):
0

Adjusting the absorbed dose value to measure biological effects of different types of ionizing radiation is accomplished by the:

Quality factor

1

Which of the following would produce the greatest dose to the patient?

A. Increased Filtration
B. Increased SID
C. Decreased SID
D. Decreased mAs

Decreased SID

2

Which of the following would NOT be used to help reduce patient dose?

A. Collimation C. Shadow shield
B. Grids D. Contact shield

Grids

3

The genetically significant dose (GSD) is used to assess the ______ from a source of radiation exposure.

Genetic risk to a whole population

4

An increase in filtration of the X-ray beam would result in an:

Increase in the half value layer

5

The sensing material in a thermoluminescent dosimeter badge is:

Lithium fluoride

6

Which of the following statements is NOT true in regard to the somatic effects of radiation?

A. Effects may occur within minutes after exposure
B. Effects may occur years after exposure
C. Somatic effects are common in radiographers
D. Somatic effects include cancer

Somatic effects are common in radiographers

7

In order to reduce the occupational exposure to radiation during C-arm fluoroscopy, where is the best location for the X-ray tube?

Under the patient

8

What is the most common type of interaction within diagnostic range of 70-150 kVp?

Compton

9

The rad is determined by the:

Amount of energy deposited in an absorber by radiation

10

Acute radiation lethality is measured quantitatively by:

LD 50/30

11

According to NCRP#116, the annual effective dose limits for members of the public include:

Human made radiation

12

The Environmental Protection Agency recommends that action be taken to reduce the level of radon in the home of the radon concentration exceeds ________ pCi/L.

4

13

Beam filters (collimator filters) serve to ____ in radiography.

Reduce patient exposure

14

Acute radiation syndrome has three separate syndromes. Which of the following is NOT one of them?

A. Central nervous system
B. Hematologic
C. Gastrointestinal
D. Cytogenetic

Cytogenetic

15

The radiographer's source of radiation exposure is scatter radiation produced by:

Compton effect

16

Early studies of the Japanese atomic bomb survivors demonstrated a relatively high incidence of:

Leukemia

17

The _____ is used to determine the required thickness of a structural protective barrier.

A. Distance between the radiation source and barrier.
B. Occupancy factor
C. Workload factor
D. All of the factors above help determine the barrier thickness

D. All of the factors help determine the barrier thickness

18

In the diagnostic x-ray range (50-150kV) the greatest amount of absorption would occur in what?

Bone

19

If a patient receives ______ rad during a radiographic procedure it should be noted in the patient record, according to FDA standards.

A. 1-2
B. 10-20
C. 100-200
D. 1,000-2,000

100-200

20

All electromagnetic radiations possess the same:

Velocity

21

Only x-rays produced at the _____ shell are of sufficient energy to be used for diagnostic radiography.

K shell

22

Which fill factor of the pixel in a flat panel TFT digital detector will provide better spatial and contrast resolution?

A. 10% C. 50%
B. 20% D. 80%

80%

23

What would be the result of increasing the kVp by 20% when using automatic exposure control?

A. Increased density C. Decreased exposure time
B. Increased contrast D. Increased mAs

Decreased exposure time

24

The number of electrical impulses through the X-ray tube in one second that utilizes a three-phase, six-pulse system would be:

360

25

The output current from the secondary of the transformer is

Alternating current

26

The _____ uses zinc cadmium sulfide in the phosphor layer.

Image intensifier output screen

27

Which of the following is not produced at the x-ray target?

A. Bremsstrahlung radiation
B. Characteristic radiation
C. Compton effect
D. All occur at the x-ray target

Compton effect

28

The inverse square law involving distance could be applied to:

A. Intensity of radiation C. Force of magnetic fields
B. Force of electrostatic charges D. All of the above

All of the above

29

The material used most often for the filament is ______ because of the high melting point and because it does not vaporize easily.

Tungsten