Film-Screen Image Acquisition, Processing and Image Analysis Flashcards

Comprehensive vocabulary flashcards covering the processing room layout, construction parameters, entrance systems, safe/white lighting, filters, dry and wet sides, processing equipment, and chemical hazards from the lecture notes.

Processing Room

Also known as the darkroom, a completely lightproof room designed for the handling and storage of X-ray film, and where the processing of the latent image takes place.

Darkroom Dimensions

The standard physical specifications for a darkroom, requiring a minimum floor area of $10\,\text{sqm}$ and a ceiling height of $2.5\text{--}3\,\text{m}$.

Darkroom Wall Shielding

Radiation protection requirements for darkroom walls, specifying solid concrete $15\,\text{cm}$ thick or lead lining of $1.5\,\text{mm}$ for $100\text{--}150\,\text{kVp}$.

Darkroom Relative Humidity

The required moisture level in the darkroom maintained at $40\text{--}60\%$, where levels below $40\%$ produce static artifacts and levels above $60\%$ cause film fog.

Darkroom Temperature

The required darkroom thermal range maintained between $18\text{--}20^\circ\text{C}$ to prevent static electricity and film fog.

Air Changes per Hour

The ventilation standard requiring a minimum of $10$ air changes per hour in the darkroom.

Single Door System

A darkroom entrance type featuring a latch or lock on the inside that is capable of being released from the outside in an emergency.

Double Door System

A darkroom entrance featuring two doors with a small vestibule in between, equipped with an electrical interlock so one door cannot open until the other is closed.

Maze / Labyrinth Type Entrance

A light-tight entrance where light is reflected at least $3$ times on matte black interior walls, featuring a vertical height of $2\,\text{m}$, length not less than $3\,\text{m}$, and width not more than $700\,\text{mm}$.

Revolving Door System

The most efficient but most expensive entrance, consisting of two black cylinders $3\,\text{ft}$ in diameter extending about $15''$ into each room, where the inner cylinder rotates with a single opening.

White Light (Darkroom)

Moderate-intensity ceiling illumination ($60\,\text{W}$ tungsten or $30\,\text{W}$ fluorescent) used for equipment servicing, solution changing, and cleaning, controlled by a switch separate from and higher than the safelight switch.

Safelight

Darkroom illumination using a $7.5\,\text{W}$ or $15\,\text{W}$ incandescent bulb or LED with a filtering device to prevent fogging during film handling.

Safelight Working Distance (Carlton and Adler)

The recommended minimum working distance from the work surface of $4\,\text{ft}$ ($1.25\,\text{m}$) for both $7.5\,\text{W}$ and $15\,\text{W}$ bulbs.

Safelight Working Distance (Bushong)

The recommended minimum working distance from the work surface of $5\,\text{ft}$ ($1.5\,\text{m}$) for a $15\,\text{W}$ bulb.

Kodak Wratten 6B Filter

A dark amber safelight filter emitting orange-brown light that transmits wavelengths longer than approximately $550\,\text{nm}$, used for blue-sensitive film.

Kodak GBX All-Purpose Filter

A red safelight filter emitting deep red light above approximately $600\,\text{nm}$, suitable for both green-sensitive and blue-sensitive films.

Densitometer

An instrument used to measure blackening on exposed and processed radiographs, such as during a safelight test.

Dry Side of Darkroom

The darkroom area where photographic materials are handled dry, including cassette loading/unloading, cassette compartments, film storage, film hanger brackets, and waste bins.

Wet Side of Darkroom

The darkroom area dedicated to chemical film processing, containing developer, stop bath, fixer, wash solutions, tanks/trays, running water, draining racks, and automatic processors.

Passbox

A light-tight and X-ray-proof wall hatch with two interlocked doors labeled 'exposed' and 'unexposed' that allows cassettes to enter the darkroom without opening the door.

Cassette

A rectangular or square plastic or metallic container used to hold X-ray film and intensifying screens in close and uniform contact, available in sizes like $14\times17$, $14\times14$, $11\times14$, $10\times12$, and $8\times10$.

Film Storage Hopper

A storage compartment placed under the loading bench designed for storing unopened or unexposed film boxes vertically.

Film Hangers

Stainless steel devices used for holding radiographic film during processing, available in clip type, channel type, and spring type.

Loading Bench

A work table made of hardwood (teak) covered with linoleum used for loading and unloading cassettes, measuring $2.5\,\text{m}$ long, minimum $600\,\text{mm}$ wide, and minimum $900\,\text{mm}$ high.

Darkroom Sink

A sink placed adjacent to the processing unit measuring $250\,\text{mm}$ deep, $750\,\text{mm}$ long, and $450\,\text{mm}$ wide, with water taps placed at least $400\,\text{mm}$ above it.

Film Dryer

A device utilizing controlled heating and airflow systems to rapidly and safely dry radiographic film after processing without leaving drying marks.

Darkroom Disease

Occupational sensitivity reactions, including skin rashes, respiratory issues, and flu-like symptoms, caused by prolonged exposure to darkroom chemicals like developers, fixers, and stop baths.