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2. Regardless of the overall size of the area, if it features local holes (with a
radius extending from tens of centimeters to several meters) that are potentially
susceptible to contamination, local measurement is recommended
3. Averaged measurements performed by positioning the detector at the
height of 100 cm cannot be applied if a large area is under testing and you know
that it is locally contaminated, as well as if lateral dimensions of a contaminated
plume are known in advance (or visually obvious). Local measurements of
obviously contaminated plumes are recommended
4. If there are noticeable holes or bulges in the area, but the surface is
relatively flat within the radius of 10-30 m, make averaged measurement of surface
activity in that area (at the height of 100 cm), and measure surface activity of
certain holes as if measuring local contamination (at the height of 10 cm).
5. If the area under testing is big and flat enough, and varied covers are
typical of its different regions (for example, patches of bare ground and grass), it is
recommended to make local measurements in certain places with a homogeneous
surface.
Figure 2.42 – Measurement of rough surface
Figure 2.43 – Measurement of separate bumps
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