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10.3 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 function check has to be performed in appropriate intervals of six months. The radia-
tion protection manager has to be informed immediately if any faults on the shielding 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 cor-
rosion, the built-in source will be protected. Refer to the radiation protection guidelines in
chapter 11 to check or replace the source.
The Cs–137 sources which are typically used for density measurements have a service
life of 30 years and more. For safety reasons, we recommend replacement after 15
years. Co–60 sources have to be replaced after approx. 5 ... 10 years.
Empty calibration has to be performed any time a source is replaced!
Information on the design of source and shielding you find in the technical documenta-
tion, the seal certificate and on the identity plate.
If the source has to be renewed, you have to include the manufacturing number of the
original source in your new order.
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