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Shutter (ON/OFF) Mechanism
Depending upon whether or not your source holder uses a shutter or cable/rod
mechanism, checks are normally performed at intervals not to exceed six (6)
months. Customers who have the ability to cycle shutters or check cables/rods on
a more frequent basis without disturbing production requirements are
recommended to do so. The application of lubricating oil to the shutter
mechanism will assist in maintaining the source holder in good working order.
Perform the following procedure to verify that the shutter mechanism is working
correctly.
To test the shutter mechanism, move the actuator back and forth several times
between the OFF and ON positions.
The actuator should move easily, but not freely. There will be some
!
resistance to movement
mechanism
NOTE
1.
Use one of the two methods listed below to ensure that the shutter
mechanism is operational:
•
Method A - Using a calibrated portable radiation survey meter, take a
measurement at the back of the detector housing.
•
Field intensity should be low when the shutter is in the OFF position.
•
Conversely, when the shutter is ON, the field intensity should increase.
Measurement around the source holder may not change.
!
NOTE
•
Method B - If a survey meter is not available, use the gauge electronics
and monitor the display while moving the shutter to the OFF position.
•
Indication should go to the high process value on the display.
•
Move the shutter to the ON position and the reading should return to
normal.
39089-US-210509
due to bearing friction and inertia of the
.
Operation
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