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Figure 2 - Model 989 with optional fixture kit components
Operating the system using crank-out remote controls permits exposure of the sealed source and automatic securing
by cranking approximately 1/3 of a full revolution of the remote control hand crank.
When using the pneumatic actuator and pump control equipped with 15 to 50 foot (4.5 to 15.1 meters) air hoses, the
lock-slide of the exposure device’s automatic locking mechanism is pushed into the expose position and left in that
position until the actuator is removed at the end of the site work. To enable a radiographic exposure, the pneumatic
actuator must overpower a fail-safe return spring that acts to return the sealed source assembly into the fully
shielded position when expose pressure from the pneumatic actuator is stopped. To terminate a radiographic
exposure using the pneumatic actuator, the air supply is turned off and the pneumatic lines and actuator are
exhausted. The return spring forces the sealed source assembly back into the fully shielded position regardless of
the exposure device orientation. Conversely, if the air supply is interrupted during a radiographic exposure, the
sealed source assembly is automatically forced back into a shielded position.
B.
System Safety
The Model 989 exposure device contained within an approved transport case that is designed and tested to comply
with the requirements for Type A packaging in accordance with International Atomic Energy Agency Safety
Standard Series No.TS-R-1 (2009 Edition) & SSR-6 (2012) and the applicable USA Regulations contained in the
USNRC 10 CFR 71 and USDOT 49 CFR 173. The Model 989 was designed using the applicable specifications of
ANSI N432-1980 Type I, and ISO 3999:2004(E) Category X radiography device.
The exposure device’s design includes an automatic locking mechanism when used with Sentinel
TM
crank-out
remote controls. The lock slide that secures the sealed source also provides a visual indication of the lock slide’s
secured (green) and unsecured (red) positions.
Summary of Contents for 989
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