Model 3430 Plus & 3440 Plus
PREPARING A TEST SITE
To ensure measurement accuracy, properly prepare the test site
before taking gauge measurements. This section describes how to
prepare test sites properly for soil and asphalt measurements.
SOIL SITE
✓
Locate a smooth site on the soil that is free from any large
holes, cracks, or debris.
✓
If necessary, smooth the surface by moving the scraper plate in
a back and forth motion.
✓
Fill any voids or depressions with fine sand or soil particles.
Strike off any excess fill.
✓
Place the scraper plate back on the surface and press down
slightly to level the surface.
✓
For direct transmission measurements:
✓
Put the drill rod through the extraction tool and then through
one of the guides on the scraper plate (Figure 4–2).
✓
Wear safety glasses and a radiation dosimeter.
✓
Place the drill rod assembly on the test site.
✓
Step on the scraper plate.
✓
Hammer the drill rod at least 50 mm (2 in.) deeper than the
desired test depth. The drill rod increments include the
additional depth.
✓
Before removing the drill rod, mark the outline of the scraper
plate as shown in Figure 4–3 to ensure the gauge is placed over
the same area as the scraper plate.
WARNING
Under no circumstances should the source rod of the
gauge be used to drill holes.
To Next Page
Loading...
Need help?
General
