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7 Source Replacement Volume 1
7.2 Rod Source Replacement
This section describes how to replace rod source in the following
shieldings:
– Type 80
– Type 100
– Type 120
– Type 150
– Type 200
– Type 270
Radioactive sources may be replaced only by competent and
licensed persons, taking into account official regulations.
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
actual 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)
Cordon off an area consistent with the activity of the source. Pre-
vent persons from approaching.
Prepare a suitable clean space, if possible with an auxiliary shield-
ing (shielding container, lead bricks, concrete blocks etc.) where
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