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6 Explanations Volume 6
Second best solution With a full tank and a mounted detector, built in shielding with
source and closed shutter.
Figure 6-2 Second best solution
Third best solution (Recommended only for Cs-137 sources.)
With an empty vessel with a mounted detector, built in shielding
with source and closed shutter. In this way, the detector usually
receives a small amount of residual radiation from the source
Figure 6-3 Third best solution
Source with closed shutter
Rod detector
Cs-137 source with closed shutter
Rod detector