54733-10BA2L
1 – 122 02.2017
9 Radiation Protection Volume 1
9.7 Shielding and Source
Shieldings do not include any wearing parts or mechanically moving
parts that under normal operating conditions require maintenance.
For safety reasons, however, it should be possible any time to lock
the useful beam. A functional check has to be performed in appro-
priate intervals of max. one year (see chapter 9.3). The Radiation
Safety Manager has to be informed immediately if any faults on the
shielding or a sluggish locking mechanism are detected. If the prob-
lem cannot be solved simply by cleaning, you have to stop working
with the system until it has been repaired.
As long as the shielding does not show any significant mechanical
damage or strong corrosion, the built-in source will be protected.
Please observe the radiation protection guidelines when checking or
replacing the source.
The radioactive sources used and the function area of the measur-
ing system typically permit a service life of more than 10 years. The
useful life of radioactive sources should be based on the period of
use recommended in the leak test certificate. A source may have to
be replaced earlier if the statistical variations which increase in the
course of time become intolerably high and any compensation by
increasing the time constant is not acceptable any more, e.g. for
control-engineering reasons.
Empty calibration has to be performed any time a source is
replaced!
For information on the design of source and shielding please refer
to the technical documentation and the identity plate (Fig. 9-1).
Fig. 9-1 Identity plate
1
2
3
4
5
6
7
8
9
1 Source number
2Isotope
3 Source manufacture date
4 Shielding material
5 Type of shielding
6 Shielding manufacturer
7 Dose rate in 1m distance
8 Effective shielding thickness
9 Activity
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