Prelim | Procesing Room Design Flashcards
Films are 2-8 times more sensitive when exposed to white light illumination and ionizing radiation
Principle of Latensification
Principle of Latensification
Films are (1) times more sensitive when exposed to (2) and (3)
- 2-8
- white light illumination
- ionizing radiation
What image do films contain?
Latent image (invisible)
Main function of the dark room
to prevent/ protect film from exposure to white light illumination and ionzing radiation during handling and processing
Location of dark rooms
- centrally located
- in proximity / near to exposure room
Size of dark rooms (general)
15ft * 9.5 ft or greater (min. of 10sq ft.) and can accomodate 200 radiographs/ day
Size of dark rooms (ceiling height)
2.7 - 3.3 m
Sections of the dark room
Wet and Dry section
Example of dark room’s wet section
- Manual/ Automatic processor
- Drying rack
Distance of the wet and dry sections
4ft away
What should be considered in a dark room’s construction?
- Wall
- Floor
Criteria for concrete wall construction
Greater than 6 inches [to absorb ionizing radiation] (3 3/4” in if added with lead)
Criteria for hollow block wall construction
filled with cement
Criteria for wood wall construction
with 1.5mm Pb (1/16 in)
Criteria for the color of walls
light/ bright tones (to reflect color of the safelight)
All criteria for the construction of wall
- Concrete should be greater than 6in (3 3/4” if added w/ lead)
- Hollow bolocks are filled with cement
- Wood is with 1.5 mm Pb (1/16 mm)
- Color: light/ bright tones
- Light places
All criteria for the construction of floor
- Should be non-slippery and free from any stored objects
- Space should be sufficient for at least 1-2 persons to work inside the dark room
- Chemical resistant
Example of chemical rsistant materials for the construction of floors
Tiles/ concrete ( easy to clean)
Types of entrances
- Single door dark room
- Light-lock door/ double door
- Layrinth/ maze
- Revolving door
Simplest type of entrance
Single door darkroom
2-way exit/ entry way
Light-lock door/ double door
zigzag entryway
Labyrinth/ maze
fastest access type of door
revolving door
one entry and exit way type of entrance
Revolving door
Maintains proper temperature and humidity
Ventilation
Types of ventilation
- Exhaust fan
- AC
- Electric fan
Storage room temperature
10-20° C / 50-70° F
Storage room and darkroom humidity
40-60%
Measures temperature
Thermometer
Measures humidity
Psychrometer
Types of lighting
- Whitelight
- Safelight
Functions of the whitelight
- inspection and maintenance of cassette
- cleaning work surfaces
- servicing of equipment
- changing of solution
Provides enough light to illuminate the darktoom while ensuring that the film remains unexposed
Safelight
Compositions of safelight
- incandescent (?) lamps with a color filter
What is the safelight’s filter made out of?
Glass tinted with different colors
Has the capacity to emit all typess of light
LED Lamps
Safelight wattage
15 W
Distance of safelight
No closer than 1.5m (5ft) from the work space
Physics of light
Frequency of light is inversely proportional to its wavelength
Wavelength of the color red
Long ƛ at 700nm (low f)
Wavelength of the color violet
Short ƛ at 400 nm (high f)
Safelight filters
- Kodak Wratten Series 6B Filter
- Kodak GBX Filter
Color of the Kodak WS 6B filter and what color it emit
- Amber filter (reddish yellow)
- Emits orange-brown light
Color of the Kodak GBX filter and what color it emit
- Red filter
- Emits dark red light
Transmits light that has a ƛ longer than 550 nm
Kodak WS 6B Filter
Transmits light that has a ƛ above 660 nm
Kodak GBX Filter
What type of safelight filter moves toward red? and what moves toward violet?
Towards red: Kodak GBX filter
Towards violet: Kodak WS 6B FIlter
Compatability of the filter color of the safelight to the color sensitivity of the film
Spectral matching
Spectral matching refers to the compatability of the (1) of the safelight to the (2) of the film
- filter color
- color sensitivity
