|MASS MINIATURE RADIOGRAPHIC ROLL FILM CASSETTE MAINTENANCE
|P Krishna Reddy: NTI Bulletin 1993, 29, 13-16.
This paper discusses briefly the scope for handling
the roll film cassettes, its maintenance and repair, under the National
Tuberculosis Programme (NTP). The District Tuberculosis Centre (DTC)
use the roll film cassettes (RFC) which are hand operated. There
are three models: RFC-1, RFC-2 and RFC-3. The roll film cassette
is meant to accommodate 70mm and 3mts length of oneside coated film
which is meant to take 40 exposures. One can take 45-50 exposures
by using the leader and trailer portion of the film. Two types of
films are used:one is acetate base and the other polyester base.
RFC-1 is an old model and is not used now. RFC-3 is an improvised
version of RFC-2 where the film is pressed more firmly so that blurred
images do not form. It also has a microswitch to notify the operator
about the presence or absence of film in the cassette. RFC is
divided into three parts 1) film magazine 2) cassette frame and
3) housing. RFC is a costly equipment and should be maintained with
care: free from dust, dirt, chemicals etc,. After prolonged use,
(ie) 8-10 years, parts can wear out. At that time, it would be useful
to contact NTI regarding servicing, replacement of wornout parts
Since many moving parts are accommodated in a small
space, removal, replacement and servicing of the RFC is a highly
skilled work. It requires special talent, a mechanical eye and a
knack to use tools.
|KEY WORDS: ROLL FILM CASSETTE, MAINTENANCE.