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7 Source Replacement Volume 1
Cordon off an area consistent with the activity of the source. Pre-
vent persons from approaching.
If sufficient space is available, the source can be replaced in the
shielding installed at the measuring site. To this end, bring the new
source in its transport shielding close to the measuring site.
Prepare a suitable, clean space, if possible with an auxiliary shield-
ing (shielding vessel, lead bricks, concrete stones, etc.) and place
the source holder and the source there on a piece of paper to pro-
tect it against dirt.
Depending on the construction, you either have to open the lock on
the shielding and turn the lever to center position between ON and
OFF until the hexagon head bolt of the source holders becomes vis-
ible, or remove the locking plate, so that you can unscrew the
source holder.
7.1.1 Procedure for Source Replacement
Open the lock of the shielding (1) halfway, so that you can
unscrew the source holder (2) together with the source (3)
using a socket wrench.
Figure 7-1 Situation source holder
Hazards due to nuclear radiation!
Do not remove the source from the shielding!
Do not touch the source to prevent a high partial body dose. Only
touch the source with tools that allow you to grab the source easily
and safely, e.g. a pipe wrench. Do not push the pipe wrench tight
too much to prevent damage to the source. Hold the source far
away from your body and put it down, if possible, behind an auxil-
iary shielding.
Remove source from shielding Unscrew the source from the source holder using a socket
wrench (size 10mm). Hold the source holder using a second
socket wrench (size 12mm).
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