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Figure 2.44 – Measurement of heterogeneous surface
2.6.2.3 Additional recommendations for measurements
1.
Use simple supporting stands made of light materials (for example,
the 10 cm thick sheet of foamed plastic can be put under the device for local
measurement) to hold the device at a necessary height during measurement time.
Keep the stand free from contaminants.
2.
Local measurements are preferable to make averaged measurements
more precise.
3.
Even if the area is ideally flat and smooth it is recommended to make
a series of measurements at different points (averaged measurements in each
5-10 m, while local ones – 1-3 m).
4.
If contamination is known to penetrate the soil at the depth of up to
5 cm and deeper, monitor a contaminated area in the mode of specific activity
measurement by placing the device on the soil or by collecting samples.
5.
Before you start measuring, make sure there are no relatively high
objects (buildings or trees) contaminated with cesium in the vicinity (at a distance
of one meter to tens of meters), since the detector may sense radiation emitted by
such objects and yield incorrect measurement results of soil contamination.
Figure 2.45 – Local measurements
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