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MAAJID MOHI UD DIN MALIK
DARK ROOM
MAAJIDMALIKOFFICIAL@GMAIL.COM 1
RADIOLOGY HUB

INTRODUCTION
A darkroom is used to process photographic film, to make
prints and to carry out other associated tasks. It is a room
that can be made completely dark to allow the processing of
the light-sensitive photographic materials, including film
and photographic paper. Various equipment is used in the
darkroom, including an enlarger, baths containing chemicals,
and running water.

CONT…
 It should be in close proximity to the place where the work of radiographer is carried
out.
 It should serve as many imaging rooms as geographically possible.

LOCATION
 It should be centrally sited and served by
hatches(pass boxes) from the adjacent imaging
rooms.
 Away from damp and hot areas
 Power and water accessibility
 Adjoining viewing area where processed films can be
checked or sorted out

DARKROOMSIZE
 Minimum floor area of 10m2
 Ceiling height 2.5-3m
RADIATION PROTECTION
 Coating the walls with barium paste or increase the
thickness
 Lining the doors with LEAD ply-sheet
 Shielding any gaps around the door

FLOORS
 Durable and easy to maintain(Eg: Plastic tiles)
 Non porous non slip flooring material

WALLS/CEILING
Light in color
Easy to wipe over and keep clean

VENTILATIONAND HEATING
 Satisfactory working condition for staff
 Good film handling and storage conditions This can
be ensured by:
 Relative humidity : 40-60%
 Min of 10 air changes per hour
 Room temperature 18-200C

DARKROOMENTRANCE: SINGLEDOOR

DARKROOMENTRANCE: DOUBLEDOOR

DARKROOMENTRANCE: MAZE

DARKROOMENTRANCE:REVOLVINGDOOR

DARKROOMILLUMINATION
2 modes of lighting :
 Ordinary white lighting
 Safe lighting

WHITELIGHTING
It is necessary for
 Inspection and maintenance of cassettes and screens
 Cleaning of work surfaces and floors
 Servicing of equipment White
light should be
 Close to the ceiling to avoid shadows
 Moderate in intensity (60W tungsten /30Wfluorescent)
 Centrally placed

SAFELIGHTING
Need: Working in compete darkness all day long is not a
pleasant condition to work on.
White light cannot be used as it causes fogging of film.
Hence DIM COLORED LIGHTING sufficient enough to work
at is used
BUT THERE IS NO TOTALLY SAFE “SAFE”LIGHTING

WHYSAFELIGHTINGISNOT100%SAFE
 No Filter completely absorbs the undesirable
wavelengths
 All films have SOME sensitivity to all wavelengths
HOW TO MAKE IT MORE SAFER?
 Reduce the film handling time and intensity of
illumination
 Recommended Standard : 25w lamp sited at a minimum
of 1.2m from the film

CONSTRUCTION
 Colored gelatin filter is sandwiched
b/w plane glass
 Fitted in a metal lantern box

AREAS WHERESAFELIGHTIS REQUIRED
 Film loading / unloading areas.
 Processor film feed-in points.
 Path b/w above two.
 At developer tank.

SAFELIGHTTYPES

SAFELIGHTHANDLINGTIME
Maximum time a film can be exposed to safelight
during the procedure without
causing any appreciable degree of fogging.
Average time : 20-45secs
Faster films need shorter time

EQUIPMENTANDARRANGEMENT
An automatic processor
Cassette hatches
Film storage hopper
Loading
bench/cupboards

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Dark room

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Dark room