RADIOGRAPHIC FILM

1. RADIOGRAPHIC FILMS
GEETASHREE MAJUMDAR
(ASSISTANT PROFESSOR)
RIMT UNIVERSITY

2.  Radiographic film is a device sandwich between the
radiographic intensifying screen in a protective cassette.
 it is a device which help us to to record the information
regarding the object through which the x rays passes & hence
they greatly help in diagnosis, and treatment of the patient
problem.

3.  The first x rays were recorded on glass plates. These were
coated with emulsion on one side only.
 During WWI , nitrocellulose based films was found.(single
emulsion).
 It was later discovered double emulsion.
 In 1924, cellulose acetate replaced the nitrocellulose based
film.

4.  There are four layers present in the radiographic film—
a) Base layer.
b) Adhesive layer.
c) Emulsion layer.
d) Protective layer

6.  This is the foundation of the film.
 Thickness is 0.18mm
 Provides a surface and support for emulsion.
 Consists of polyester, polyethylene, terephthalate, resin are used.
 Transmit light.
 It is flexible , thick and strong

7.  Also called subbing layer or substratum layer.
 Made of mixture of gelatin solution and solvent of film base.
 It keep emulsion layer and base adhered to each other.

8.  It is known as active layer of film.
 It also known as heart of radiographic film.
 It is consists of a homogenous mixture of gelatin and silver halide such as
AgBr and AgI .
 In typical emulsion 90-99% is AgBr and about 1-10% is AgI. (AgI more
sensitive than AgBr)

9.  Thin layer of Gelatin.(derived from animal tissue and is a form of collagen)
 Protect the emulsion from mechanical damage.
 Reduces damages from pressure, handling and processing.