SIGMA projetor - Manual (Page 13)

OPERATING INSTRUCTIONS
2.2
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
STEP 1
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 2 mSv/hr (200 mR/hr) on any
surface of the exposure device. Use this measurement for verification surveys of the source
assembly’s return to the fully shielded/secured position within the exposure device after each
radiographic exposure.
STEP 2
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 20 in (0.5 m) to avoid restricting the movement of
the source assembly.
Make sure that the source guide tubes do not contact any heated surface greater than 140°F (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.