3B Scientific Filmpack 2 - Manual (Page 2)

A TELTRON Product from UK3B Scientific Ltd. ▪ Suite 1 Formal House, Oldmixon Crescent ▪ Weston-super-Mare
Somerset BS24 9AY ▪ Tel 0044 (0)1934 425333 ▪ Fax 0044 (0)1934 425334 ▪ e-mail [email protected]
Technical amendments are possible
© Copyright 2012 3B Scientific GmbH
3. Operation
3.1 Processing
• Before drawing liquid into the syringe, raise
the piston by 1 ml so that there will be air
above the liquid. This will ensure that all the
liquid will he expelled from the syringe and
tube on injection.
• Inject the developer with the syringe and
attachable cannula after the latter has been
inserted into one of the apertures in the en-
velope adjacent to the wording.
It is important to ensure that the developer wets
both surfaces of the film and that it is agitated
during the period of development.
• Apply gentle pressure with the forefinger and
thumb on the film envelope.
• Inject the fixer after the period of develop-
ment without expelling the developer.
Processing Developer Fixer
Time 1½ mins. 4 mins.
Filmpack 2 2½ ml 3½ ml
Filmpack 4 3½ ml 5 ml
3.2 Removal of film
• At the end of the fixing period cut off, with
scissors or a sharp knife, one corner of the
filmpack and expel, with gentle pressure, the
bulk of the entrained fluid.
• Then cut off the bottom edge of the enve-
lope and remove the film by gripping one
corner with the film clip supplied.
• Wash the film in running water for a few
seconds before inspection.
If the film is required for permanent records, fix it
for a further ten minutes and then wash it for 30
minutes in running water. Standard fixer with or
without hardener can be used.
3.3 Storage of chemicals
Whilst the fixer is fairly stable, some deteriora-
tion of the developer can occur due to the air
above the liquid. Consequently if a part full bot-
tle of developer is to be stored for some time, it is
recommended that it be transferred to one of a
smaller volume and in these circumstances the
liquid should be usable over long periods. Dete-
rioration of the developer is indicated by brown
colouration appearing.
When disposing the chemicals the local regula-
tions are to be observed.
3.4 General
In exposing radiographs, the film-to-object dis-
tance should be a minimum and the film-to-
source distance should be as large as possible
consistent with a reasonable exposure time
(refer to the manual of the X-Ray Apparatus
1000657 or 1000660) and the size of the source
of X-rays (focus of TELTRON X-ray tube is circa
2 x 2 mm).
The film can also be blackened by beta and
gamma radiations from the low energy sources
available to schools.
Where the radiation contains a high percentage
of
" soft " X-rays, the texture of the envelope of the
filmpack may be apparent on the developed film.