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FILM-SCREEN LAB > DARK ROOM > Flashcards

DARK ROOM Flashcards

1
Q

this is where the beginning and end of a radiographic work is

A

Darkroom

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2
Q

What is the beginning of radiographic work?

A

Loading of film in the cassette

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3
Q

What is the end of radiographic work?

A

The film is radiographically processed and the cassette is brought back to the darkroom

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4
Q

What is a dark room?

A

Place where a latent image is recorded on the film by radiographic equipment and then converted into a visible image

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5
Q

What are the 3 basic components of a dark room?

A

Workbench
Film bin
Processing tank

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6
Q

Another name for workbench

A

countertop

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7
Q

The workbench should be made of _____ and _____ material

A

durable and static-resistant

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8
Q

The most common material for the workbench is?

A

Formica

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9
Q

What added protection should the workbench have?

A

It must be grounded to prevent static discharge during film handling

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10
Q

Maintenance of the workbench

A

the workbench must be dry, clean, and static-free to avoid the formation of artifacts

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11
Q

What is the ideal size of a workbench?

A

60 cm wide x 150 cm long (2x5 ft)

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12
Q

This is used to store films that have been removed from their light-tight boxes

A

film bin

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13
Q

Why are radiographic films stored in a film bin?

A

So that they are easily accessed to reload empty cassettes

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14
Q

What are the 2 types of film bins?

A
  1. Lock-a-bin

2. Film bin minder

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15
Q

What is the difference between lock-a-bin and film-bin minder?

A

L: is an ordinary film bin that prevents accidental exposure of the film

F: uses an audible signal that buzzes continuously while the film bin door is open

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16
Q

When the door is closed in the film-bin minder, the signal ______.

A

turns off

17
Q

Up to what film size can the film-bin minder store?

A

14x17 ft

18
Q

2 parts of a processing tank

A

Master tank and Insert tank

19
Q

What is the difference between a master tank and an insert tank?

A

M: made of either fiberglass, stainless steel, or plastic and holds the insert tank in place

I: made of either fiberglass, stainless steel, or plastic and holds the chemical solutions used for the different parts of developing

20
Q

Both materials used for the master tank and insert tank should be what?

A

Non-corrosive (non-flammable)

21
Q

What are the common accessories in the DR?

A 
Mixing paddles
Special Thermometer
Interval timer
Film Hangers
Film Hanger rack
22
Q

This is used to stir solutions so that it evens out the concentration of the chemicals

A

Mixing Paddles

23
Q

Used to take temperatures of the chemicals in the DR

A

Special thermometer

24
Q

For every _____ increase in temperature, there should be a corresponding ____ decrease in the development time & vice-versa

A

degree, 1/4 min

25
Q

This is used to accurately measure the time of development

A

interval timer

26
Q

This must be readily available in sizes and preferably made of stainless steel

A

film hangers

27
Q

This must be capable of holding the film hangers

A

film-hanger rack

28
Q

What are the 3 functions of cassettes?

A
  1. Keeps the IS and film in close contact with one another to produce a sharp image
  2. Protects the IS and film from physical damage
  3. Protects the film from being exposed to external light
29
Q

What is low-beam attenuation

A

an only little amount of Xrays are to be absorbed

30
Q

What is backscatter

A

scattering of radiation/ x-rays that changed direction upon interaction with patient/matter

31
Q

What are the features of an ideal cassette?

A
  • Lightweight
  • Easy to open & close
  • No sharp edges/corners
  • Strong and rigid
  • Provide minimum beam attenuation
  • Must have an adequate layer of lead foil in the internal surface attached to minimize the risk of backscatter
  • Has uniform contact between film & intensifying screen
32
Q

Give 5 ways to care for cassettes

A
  1. Cassettes should be handled gently to avoid internal & external damages
  2. Cassettes should be stored in a protective bin rather than on the floor leaning against the wall
  3. Cassette surfaces should be cleaned routinely with alcohol or any antiseptic spray
  4. Cassettes should never be stacked horizontally because this can cause warping that can lead to light leaks and poor screen-film contact
  5. Cassettes should be numbered properly outside and on in the IS to immediately trace the defects on the radiographic film
33
Q

What is agitation?

A

Film being soaked while gently being moved up and down

34
Q

What kind of artifacts appear when you don’t agitate?

A

circular transparent artifacts

FILM-SCREEN LAB (2 decks)

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