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FILM SCREEN > Lesson 2 > Flashcards

Lesson 2 Flashcards

1
Q

Foundation for the x-ray film

A

Base

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2
Q

Material where emulsion is coated

A

Base

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3
Q

150 to 300 μm thick

A

Base

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4
Q

History of base:

A

Glass plate
Cellulose nitrate
Cellulose triacetate
Polyester

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5
Q

Breakable

A

Glass plate

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6
Q

Flammable

A

Cellulose nitrate

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7
Q

also called safety base - thick compared to polyester

A

Cellulose triacetate

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8
Q

modern film base

A

Polyester

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9
Q

CHARACTERISTICS OF A GOOD BASE MATERIAL

A

• Dimensional stability
• Optical clarity/uniform lucency
• High tensile strength
• Flexibility
• Inert to processing chemicals
• Chemical memory
• Non-flammable
• Waterproof
• Blue tinted

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10
Q

Thin coat of gelatin

A

Adhesive layer

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11
Q

Silver halide crystals in gelatin binder

A

Emulsion

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12
Q

Hardened gelatin

A

Supercoat or overcoat

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13
Q

the range of frequencies over which
an electromagnetic radiation can b e propagated.

A

Electromagnetic spectrum

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14
Q

the range of wavelengths of the electromagnetic
spectrum over which an unaided human eye can perceive wavelength changes as an alteration in color.

A

Visible spectrum

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15
Q

Is the sensitive material use to record the image and is made up of suspension of light sensitive salts (Silver halide crystals) and
gelatin binder.

A

Emulsion

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16
Q

the principal material used for film emulsion.

A

Silver halide crystals

17
Q

2 Silver Halide Crystals used for x-ray type film:

A

Silver iodide (Agl)
Silver bromide (AgBr)

18
Q

Is the range of wavelength of the electromagnetic radiation that the film wil respond.

A

Spectral sensitivity

19
Q

compatible with calcium tungstate IS which emits blue light

A

Blue sensitive film

20
Q

a natural sensitivity that ends at the blue region
of the visible spectrum (480 nm).

A

AgBr

21
Q

was adopted to create films with increased
sensitivity.

A

Spectral Sensitizing (Vogel in 1870’s)

22
Q

Is the process of extending the sensitivity of
AgBr crystal by coating the surface of the
crystal with one or more layers of dye.

A

Spectral sensitizing

23
Q

Types of film according to sensitivity

A

Monochromatic
Orthochromatic
Panchomatoc

24
Q
  • Blue Sensitive
  • Compatible with calcium tungstate screen
  • no longer used today
A

Monochromatic

25
Q
  • Green Sensitive
  • Used with gadolinium oxysulfide IS
  • currently, the most commonly used type of film
A

Orthochromatic

26
Q
  • Sensitive to all colors of the visible spectrum
  • Not popular
  • Has to be processed in total darkness
  • no longer used today
A

Panchromatic

27
Q

Type of grains

A

Globular grain
Tabular grain

28
Q

spherical in shape and has a bigger volume. Use for
blue-sensitive film.

A

Globular Grain

29
Q

has a table-top-like structure that provides a bigger
surface are but a smaller volume.

A

Tabular Grain

30
Q

first binder use. A mixture of gun-cotton, ether,
and alcohol.

A

Collodion

31
Q

from the word “gelata” which means formation in
water. It comes from the collagen fiber in which the primary sources are the cartilage, skin, and the protein matrix (ossein) of the bones of animals. It is the modern binder used.

A

Gelatin

32
Q

These are films that have an emulsion layer coated on both sides of the film base.

A

Duplitized or Double-emulsion.

33
Q

Films that have emulsion layer coated on only one side of the film base.

A

Single-emulsion films

FILM SCREEN (3 decks)

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