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Rad Phys Exam 1 > Exam 1 > Flashcards

Exam 1 Flashcards

1
Q

The fetus is most sensitive to radiation in what trimester?

A

1st

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2
Q

Which unit of measure is usually used for reporting occupational exposure to radiation?

A

REM

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3
Q

The focal spot size is usually set in conjunction with what?

A

High voltage circuit

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4
Q

Which primary factor is responsible for the “quality” of an X-Ray beam?

A

mA

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5
Q

The mA setting determines…

A

The current going through the filament

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6
Q

What would have the least fluctuation in the kV level?

A

High frequency

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7
Q

What propels the electrons in an X-Ray tube?

A

KV and Cathede

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8
Q

A tube warm-up procedure should be performed by using how many exposures?

A

2

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9
Q

Define: Thermionic emission

A

Cloud of electrons at the filament

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10
Q

The purpose of ____________ is to absorb unneeded X-rays

A

Collimator shutters

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11
Q

Which 3 radio graphic projections routinely uses compensating filters?

A

AP thoracic, Lateral thoracic, full spine

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12
Q

What darkens a film?

A

Increased kVp, increased mA, increased time of exposure, increased beam size

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13
Q

What lightens a film?

A

Increased tube distance, increased compensating filtration, decreased beam size

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14
Q

Lateral film is too dark and the cervical spin is larger than x-rays you took 3 months ago. Which mistakes will you accuse the operator of?

A

Taking the film at 40 inches instead of the 72 inches you used

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15
Q

What machine do you want to have

A

Dual focus tube with a tungsten target surrounded by copper with the same anode angle of 14 degrees and tungsten filaments

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16
Q

The initials FFD, TFD, and SID refer to what?

A

Distance between the source of the X-Ray and the film

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17
Q

What is the most commonly used dosimeter?

A

Film badge

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18
Q

Imagine that you are a wee little photon that has sailed through space at a high rate of speed which has carried you into and out of a patient. Which would be the next thing you encountered?

A

Grid

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19
Q

The number of electrons is controlled by…

A

Low voltage circuit

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20
Q

Which effect would a smaller anode angle have compared to a large angle?

A

Would create a clearer image

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21
Q

What contributes most radiation to a human’s annual exposure?

A

Radon gas

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22
Q

T or F: Having the anode toward the cervicals would be the most helpful in producing a good quality A-P full spine X-Ray

A

TRUE

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23
Q

In checking your collimating, what percentage is the limit of inaccuracy?

A

2%

24
Q

Which part limits the size of the useful X-Ray beam?

A

Collimator

25
Q

IU designation for the rad?

A

Gray

26
Q

“Useful beam” exits which part of the tube?

A

Window

27
Q

Filament is surrounded by…

A

The focusing cup

28
Q

What is used to tell us that the X-Ray beam is centered to the part being radiographer?

A

Light and mirror

29
Q

At a set FFD and film size the LESS COLLIMATION used the _______ the film will be

A

DARKER

30
Q

You’ve taken an A-P thoracic radiograph and notice that the upper part of he spine is OVEREXPOSED. What would you do?

A

Use a filter for the upper part of the film

31
Q

Federal regulation require how much filtration for an X-Ray machine that operates at 70 kV-100 kV?

A

2.5 mm

32
Q

What is used for the construction of most compensating filters?

A

Aluminum

33
Q

What allows one to move the tube stand?

A

Tube track

34
Q

10 day rule concerns:

A

Patient during a 10 day period from the onset of menses

35
Q

P-A would be better than an A-P because…

A

It will decreased breast and gonad exposure by 95%

36
Q

If you had a film that was too dark what would solve your problem?

A

Decrease mAs

37
Q

What governs the speed of electrons?

A

kV

38
Q

Main function is the removal of soft rays?

A

Tube filters

39
Q

Oil is normally found where in the tube complex?

A

Between tube and tube housing

40
Q

What is the main purpose of oil in the tube complex?

A

To cool the tube

41
Q

What is the primary controlling factor for contrast?

A

kV

42
Q

Last thing you should do before pressing the exposure button?

A

Activate the rotor

43
Q

Which type of anodes should you use?

A

Rotating

44
Q

Before moving the tube stand on the track what must be accomplished?

A

Lock must be released

45
Q

The larger or small focal spot is usually set simultaneously with the….

A

Milliamperes

46
Q

Is you wanted to increase the number of photons reaching your film you should…

A

Increase the mA

47
Q

Comparing 2 films with the kV and mAs constant, one taken at 40 inches FFD and the other at 72 inches FFD, what would occur?

A

Increased density of 40 inch film and decreased image size on 72 inch film

48
Q

Which is responsible for changing AC current to DC current?

A

Rectifier

49
Q

What stops the electrons?

A

Anode

50
Q

Low voltage circuit would produce…

A

Thermionic emission (“boiling off” of electrons)

51
Q

The _____ of the anode is responsible for the anode heel effect

A

BEVEL

52
Q

Collimator allows one to control the size of the….

A

Useful beam

53
Q

Spit screens will increase or decrease patient exposure to radiation?

A

Increase

54
Q

Where is the added filtration located?

A

On the port of the tube housing

55
Q

Which two areas are the MOST susceptible to develop a malignancy from Ionizing Radiation?

A

Bone Marrow and Breasts

Rad Phys Exam 1 (1 decks)

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