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7 Source Replacement Volume 1
7.3 Point Source Replacement on Rotary
Cylinder Shielding
This section describes how to replace point sources in the following
shieldings:
– Type 80
– Type 100
– Type 120
– Type 150
– Type 200
– Type 270
When replacing a source, you have to work with the unshielded
source for a short time.
The replacement of radioactive source must be carried out taking
into account the applicable regulations under the supervision of the
Radiation Safety Officer.
Hazards due to nuclear radiation!
When replacing a source, you have to work with the unshielded
source for a short time. An increased radiation dose is harmful to
health.
You have to carry a pocket dosimeter during work to measure the
radiation exposure. Work has to be coordinated with the competent
Radiation Protection Manager.
For Germany you have to keep in mind:
Source replacement by the customers is possible only when:
1) the respective expertise is available
2) the work required to replace the source has been approved
explicitly by the authorities in charge. Your “License to Handle
Radioactive Substances” states whether you are in possession of
such a license.
Prerequisite for this work is that the personnel is familiar with the
exact shielding construction; therefore, drawings must be avail-
able.
Preparation All necessary work has to be prepared such that it can be carried
out quickly, so that exposure to the unshielded source is kept to a
minimum. Using a drawing of the shielding, you should plan the
best procedure and have the following tools handy:
• Allan keys, sizes 4, 5, 6, 8 and 10
• 2 pairs of pliers (e.g. polygrip wrench or a pair of combination
or water pump pliers)
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