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7 Maintenance and fault rectification
VEGASOURCE 82 • Source holder
66076-EN-220119
r
1
3
4
2
5
Fig. 29: Measuring points for the measurement of the local dose rate
r Distance to the source holder
1-5 Measuring points
Always use the same distance (r) from the source holder to the meas-
uring points.
Document the measurement results.
Date of the measurement
Time of the measurement
dd/mm/yyyy
hh:mm
Measuring distance r
Value of the last measurement
(µSv)
Measuring point Measured value
(µSv)
1
2
3
4
5
Tab. 4: Measurement protocol for the local dose rate
7.4 Tightness test
The tightness of the source capsule must be checked at regular inter-
vals. The frequency 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
carried out after each incident that could impair the shielding of the
source. In such case, the tightness test must be prescribed by the
responsible radiation safety officer under consideration of the ap-
plicable regulations and comprise, apart from the source holder itself,
all other affected parts of the process vessel.
The tightness test must be carried out immediately after an incident.
