Taking the Standard Count
NOTE:
Before you start any measurements, ensure that no
other gauges are nearby. 30 feet minimum distance is
required.
A daily standard count should be performed to adjust for source
decay, environmental conditions and to check for proper
functioning of the gauge. A four-minute standard count and a
background count help to ensure the highest measurement
accuracy.
The gauge should be turned on 10 minutes before the standard
count is performed to allow all systems to warm up and
stabilize. When practical, turn on the gauge before loading it in
the vehicle so it can warm up during transport to the jobsite and
be ready upon arrival.
Site Requirements
Troxler recommends that the standard count be performed at
a levelled compacted surface, soil, or asphalt.
The test site should meet the following criteria:
A smooth, dry surface such that the EGauge does not rock.
At least 3 meters (10 ft.) from any large vertical surface.
At least 10 meters (33 ft.) from any other radioactive source
such as other nuclear gauges.
On compacted soil at least 10 centimeters (4 in.) thick and
with a wet density of at least 1600 kg/m
3
(100 pcf).
The Model 4540 gauge is placed directly on the soil when
performing the standard count.
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