VEGA VEGASOURCE 35 - Manual (Page 39)

39
7 Maintenance and fault rectification
VEGASOURCE 35 •
38132-EN-130415
7.3 Testing the switching facility
Test the function of the switching facility (source holder) in regular
intervals.
Measurement of the local dose rate
1. Loosen the fixing pin (version B) or 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,
then you have to follow the instructions in paragraph "Reaction in
an emergency case".
If it is hard to move the source insert or there are other traces
of a malfunction, then the source insert mus be locked in the
position OFF and the responsible radiation safety officer must be
informed.
In case of corrosion: Follow the instructions in chapter "Mainte-
nance/Measures in case of corrosion".
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 indication window of the indication plate as long
as the pneumatics switches 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 continuously or shows signsl
of a possible malfunction, then the source insert must be locked
in position OFF and the responsible radiation safety officer must
be informed.
If the source insert cannot be moved from ON to OFF position,
then you have to follow the instructions in paragraph "Reaction in
an emergency case".
In case of corrosion: Follow the instructions in section "Mainte-
nance/Measures in case of corrosion".
7.4 Tightness test
The tightness of the source capsule must be checked in regular inter-
vals. The sequence of the tightness test (wipe test) must correspond
to the specifications of the authorities or the handling permit.
Note:
A tightness test is not only required as a regular test but must be car-
ried out after each incident that could impair the cover of the source.
In such case, the tightness test must be prescribed by the responsible
radiation safety officer under consideration of the necessary regua-
Source holder with
manual switching facility
Source holder with pneu-
matic switching facility