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QSA Global, Inc.
40 North Avenue Burlington, MA 01803
888.272.2242
781.272.2000
qsa-global.com
Operations Manual
MAN-038 March 2019
Page 29 of 100
Transit Mode
Rotating the handle of a standard directional remote control crank in the EXPOSE direction (counter-
clockwise) moves the source assembly out of the shielded position in the gamma-ray source projector
and into the source guide tubes (projection sheaths). (See Figure 6).
The source assembly is under positive mechanical control using the remote control crank. The remote
controls may be fitted with an odometer to provide an indication of the sealed source’s position. The
odometer reading should never be a substitute for the requirement and proper use of a radiation survey
meter.
Figure 6 - Cross-sectional view of the sealed source assembly in transit mode
Exposure Mode
When the source assembly reaches the exposure head at the radiographic working position, the
odometer will indicate (in feet and tenths of a foot) the approximate distance the sealed source has
traveled. (See Figure 7).
To return the source assembly to the gamma-ray source projector the crank handle of a standard
directional control is rotated in the RETRACT direction (clockwise). When the source assembly is
returned to the fully shielded position within the gamma-ray source projector, the locking mechanism
automatically secures the source assembly. The automatic securing mechanism will not permit exposure
of the source assembly unless the radiographer pushes the lock slide into the expose position.
The remote controls cannot be disconnected from the source assembly unless the source assembly is
fully retracted into the shielded position in the gamma-ray source projector.
The system is designed for safe and reliable operation provided the system is properly used and
maintained.