Part II. Medical Fluoroscopic Installations
II-l. Introduction
Pages 34-37 contain a checklist of the physical
parameters which require evaluation and the information
important to the
radiation
fluoroscopic installations.
protection
survey
of
information are similar to
Some of these parameters and
those of
installations.
While this part's
radiographic
only the parameters
checklist is complete,
and information
unique
to
fluoroscopic installations are discussed here.
II-2. Exposure Switches and Interlocks
Hand or foot-operated fluoroscopic exposure switches
shall be
deadman
switches.
The exposure switch for
radiographic spot filming, full size cassette film, or
photofluorographic camera should be
hand
operated.
However,
some units
are hand or foot operated.
Special
procedure examination rooms may employ either hand or
foot operated switches for photofluorographic
using a photospot camera or a cine camera.
imaging
The image intensifier spot film device and tower
must be interlocked to prevent
fluoroscopic exposures
when the image intensifier tower does not intercept the
entire usefu
l
x-ray beam cross section (Reference #1).
If the system allows the removal of the image intensifier
from its tower,
an additional interlock is necessary to
prevent fluoroscopic exposures when the image intensifier
is detached, regardless
of the tower position
with
respect to the x-ray beam.
If the unit allows the x-ray
tube to be taken out of
alignment,
positioning must also be interlocked.
the x-ray tube
These interlocks
are easily verified
with
fluorescent
dosimeter intercepting the position
screen or
of the useful beam
while simultaneously activating the exposure
switch and
positioning the image receptor.
Fluoroscopic x-ray
tubes may also be interfaced to
produce radiographic exposures
(en.
other than spotfilming
35 cm x 35 cm cut film changers). In this case.
the comments made in Section I-3 concerning beam on
indicators,
non dead-man type
exposure
switches,
and
exposure switch location and cord length apply.
II-3. Fluoroscopic Timer
A timer
shall
be present which presets
the
fluoroscopic cumulative "ON" time to maximum limit of 5
minutes.
An audible signal
shall warn the operator of
22
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