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Function test
Measure the local dose
rate
VEGASOURCE 81 • Source holder
7.3
Test of the switchover
Test the function of the switchover on the source holder at regular
intervals.
Source holder with manual switchover
1. Loosen the locking screw (version X and C) and remove the lock
(if present) as described in chapter " Setup".
2. Move the source insert as described in chapter " Setup" several
times from the ON to the OFF position and vice versa. The source
insert should be easily movable and must have no traces of corro-
sion in the visible area.
If the source insert cannot be moved from ON to OFF position,
follow the instructions in paragraph " What to do in case of emer-
gency".
If it is hard to move the source insert or if there are other signs of
a malfunction, the source insert must be locked in position OFF
and the responsible radiation safety officer informed.
In case of corrosion: Follow the instructions in chapter " Mainte-
nance/Measures in case of corrosion".
Source holder with pneumatic switchover
1. Remove the padlock (see chapter " Setup")
2. Switch the source insert by means of compressed air from the po-
sition OFF to position ON. The source insert should move without
interruption to position "ON".
Caution:
Do not grasp into the display window of the indication plate while the
pneumatic actuator is switching over.
3. Reduce the pressure to below 2.5 bar (36 psi). The source insert
must move back to position OFF.
If the source insert does not move smoothly or shows signs of a
possible malfunction, the source insert must be locked in position
OFF and the responsible radiation safety officer informed.
If the source insert cannot be moved from ON to OFF position,
follow the instructions in paragraph " What to do in case of emer-
gency".
In case of corrosion: Follow the instructions in chapter " Mainte-
nance/Measures in case of corrosion".
Measure the local dose rate of the source holder at regular intervals
and document the measurement results.
The measurement data allow conclusions to be drawn about leaks
and possible changes in radiation power.
7 Maintenance and fault rectification
39
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