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6 Radiation Protection Volume 1
6.7 Shielding and Source
Shieldings do not include any wearing parts or mechanically mov-
ing parts that under normal operating conditions require mainte-
nance. For safety reasons, however, it should be possible any time
to lock the useful beam. A function check has to be performed in
appropriate intervals of max. six months. The Radiation Protection
Manager has to be informed immediately if any faults on the shield-
ing or a sluggish locking mechanism are detected. If the problem
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.
Refer to the radiation protection guidelines in section 2 to check or
replace 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. We
recommend replacing a source 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 (Figure 6-1).
Figure 6-1 Identity plate
If the source has to be renewed, you have to include the source
number of the original source in your new order. This number con-
sists of three digits, for example:
1
2
3
4
5
6
7
8
9
1 Source number
2 Isotope
3 Source manufacturing 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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