Daily Inspection Of The Remote Controls - QSA Global SENTINEL SENTRY 330 Manual

c. Inspect the source stop (exposure head) to ensure there is no excessive wear, perforations, bends
and inward dents. Perform this visual inspection with the collimator removed from the source stop.
Inspect the collimator and the attachment of the collimator to the source stop (exposure head) if used
during radiography. Verify the original equipment brass thumb-screw is being used. The use of
generic set-screws other than original equipment may damage the source stop. Typical damage may
include; scoring as a result of rotating the collimator around the source stop during radiographic set-
ups and inward dents on as a result of over tightened steel set-screws.
d. Inspect the attachment of the collimator to the source stop (exposure head) if used during
radiography. If collimator utilizes a thumb-screw to affix the collimator to the source stop, be certain
to hand tighten only. The use of tools may damage the source stop.

3.6 Daily Inspection of the Remote Controls

The remote control consists of a control crank, a control drive cable with a connector swaged at one end,
two control cable conduits and a connector plug assembly.
The control crank contains a diagonally cut, geared drive wheel that matches the outer helical winding of
the control cable. This worm-gear arrangement of the control crank drive wheel and the control cable
provides the radiographer with a reliable means to project and retract the source assembly from and to
the gamma-ray source projector.
The Model 692, 693 and 664 control cranks are equipped with a lever brake that prevents movement of
the source assembly while in the exposure head.
The Model 882 and 885 control cranks are equipped with a spring-loaded brake plunger that engages into
one of the spaced indents of the crank cover plate.
Directly below the control crank handle is a label that indicates the direction for EXPOSE and RETRACT
during use.
The label also indicates the ON and OFF position for the lever brake. The brake plunger knob is rotated
to engage the plunger and simultaneously pulled and rotated to disengage the plunger.
Some control cranks are available with an odometer to provide the radiographer with the approximate
travel distance of the source assembly. The travel distance is indicated in increments of feet and tenths of
QSA Global, Inc. 
Figure 8 – Source Stop Examples
40 North Avenue Burlington, MA 01803
Operations Manual  MAN-038 March 2019
 888.272.2242  781.272.2000
 Page 32 of 100
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