- 10 -
Figure 4 – 989 Exposure Device with removable locking cover
The radioactive source assembly attaches to the pneumatic actuator, or remote control safety plug assembly, at
the rear of device. Once the selector ring on the exposure device is rotated from the “connect” to the “operate”
position, the automatic lock mechanism’s lock-slide must be pushed laterally into the lock mechanism to enable
exposure of the source assembly. The radiographic exposure occurs when the pneumatic actuator or remote
controls expose the source assembly forward within the Model 989 (approximately 3.0 inches, 7.6 mm) from
the shielded position into the beam port position within the Model 989 exposure device.
In the exposed position, the emergent beam will be restricted to the assigned angles as manufactured. The
Model 989 is designed to be used with tungsten or lead collimator configurations. In Canada, collimation is
limited to lead collimation with emergent beams of 30 X 60 degrees or 40 X 40 degrees. The lead or tungsten
collimation must be installed by Sentinel
TM
-QSA Global, Inc. or one of its authorized distributor service
centers. A cross-sectional view of a Model 989 with a 40 X 40 degree collimated beam port is shown as a
reference in Figure 3.
2)
Model 989 Exposure device pneumatic actuator
All users of this exposure device are responsible to ensure using only a Sentinel
TM
authorized pneumatic
actuator (part number ELE 027) and Sentinel
TM
authorized air pump controls when performing radiographic
operations. This requirement is critical to maintain the designed safety during use the exposure device. DO
NOT perform modifications to the exposure device, the pneumatic actuator or the air pump control.
Modifications are not permitted by regulatory requirements in addition the increased probability of causing a
radiological emergency.
Figure 5 shows the Sentinel
TM
authorized pneumatic actuator, which can be used with the Model 989 exposure
device.
Summary of Contents for 989
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