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 27 of 100
DANGER IMPORTANT WARNING
The source assembly while in an unshielded position and the sealed source
containing the radioactive material must NOT be handled under any circumstances.
The unshielded source at close proximity can cause serious injury, sickness or death
to anyone exposed to it even for a short duration.
All specific model number source assemblies used in the SENTINEL SENTRY 330 and SENTINEL
SENTRY 110 are designed and tested for use in accordance to ISO/ANSI and USNRC requirements.
Gamma-ray source projector
The source assembly is shown in the stored position in a titanium configured ‘S’ tube at the center of the
depleted Uranium shield of the gamma-ray source projector. (See Figure 5).
A remote control unit is shown with its control cable connector coupled to the source assembly.
High density depleted Uranium shielding is used in the gamma-ray source projector to provide good
radiological protection with minimal weight.
A shielded outlet port cover mechanism permits a secure attachment of source guide tubes (projection
sheaths) without an elevation of radiation levels. The outlet port mechanism will not allow the source
assembly to be projected outside of the gamma-ray source projector unless a source guide tube has
been properly attached to the outlet port. A three-step connection is accomplished by completion of the
following steps:
1
Pull and rotate the spring-loaded outlet port cover a quarter turn (from a 12 o’clock to a 3 o’clock
position) in a clockwise direction. This action moves the protective cover away from the outlet port to
permit attachment of a source guide tube.
2
A bayonet-style fitting of the source guide tube is inserted into the outlet port and rotated a quarter
turn (from a 12 o’clock position to a 9 o’clock position) counter-clockwise. A complete insertion and
counter-clockwise rotation of the source guide tube fitting releases the lock and an internal shielding
rotor of the outlet port.
3
Rotate the spring-loaded cover an additional 60 degrees (from a 3 o’clock position to a 5 o’clock
position) in a clockwise direction until it stops. This last movement moves the outlet port shield out of
position and aligns a pass-through opening on the rotor with the ‘S’ tube and outlet port while
simultaneously securing the source guide tube fitting to the outlet port.
The design permits attachment of the source guide tubes without an elevation of radiation intensity at the
outlet port, minimizing the radiation exposure to the radiographer’s hands. The sealed source assembly
cannot be exposed out of the gamma-ray source projector unless a positive connection of the source
guide to the device has been accomplished.
The gamma-ray source projector’s locking mechanism provides three main safety features for the
radiographer during radiographic operations.
First, the locking mechanism requires a deliberate action to enable exposure of the source assembly.
This is accomplished by coupling the control cable connector to the source assembly connector, coupling
the remote control connector to the gamma-ray source projector locking mechanism and then pushing a
