SIGMA 150Ci - Manual (Page 12)

OPERATING INSTRUCTIONS
2.2
STEP 1
STEP 2
It is essential that the 5 STEPS set out below are followed
in the correct order to ensure safe operation and compliance
with regulations.
STEP 1 Exposure device survey
STEP 2 Connecting the source guide tube(s)
STEP 3 Connecting the remote control cable
STEP 4 Projecting and retracting the source assembly
STEP 5 Dismantling equipment
Exposure device survey
Check the operation of the survey meter by measuring the radiation level at the surface of
the exposure device. The radiation level measurement should not exceed 200mR/hr
(2mSv/hr) on any surface of the exposure device. Use this measurement for verification
surveys of the source assembly's return to fully shielded/secured position within the exposure
device after each radiographic exposure.
Source guide tube (projection sheath) layout
Ensure all source guide tubes that will be utilized have received a daily inspection according
to the daily inspection section of this manual. Position and secure the source stop (exposure
head) of the terminating source guide tube at the radiographic focal position using the
tripod stand and swivel clamps or some other secure and suitable means.
Ensure that a source stop (end stop) is in place on the terminating source guide tube.
Use a collimator (beam limiter) to limit the primary beam in unwanted directions.
Determine where the exposure device will be positioned and lay out the source guide tubes
as straight as possible, with no bend radius less than 20in (0.5m) to avoid restricting the
movement of the source assembly.
Make sure that the source guide tubes do not contact any heated surface greater than
140ºF (60°C).
Avoid any risk of crushing the source guide tube(s) by falling objects, vehicles or doorways
during set-up and during radiographic exposure.
Connecting the source guide tube(s)
The source guide tubes must always be attached to the outlet port of the device before
connecting the remote controls in the set-up for a radiographic exposure.
Connect the source guide tube(s) to the exposure device outlet port as shown.