TAKING A STANDARD COUNT
To adjust readings for source decay (see Appendix A) and natural
background radiation, take a daily standard count. A four-minute
daily standard count helps ensure the highest measurement
accuracy.
Locate the reference standard block shipped with the gauge.
NOTE
Always take standard counts using the reference
standard block provided with the gauge.
Before taking a standard count, ensure that the gauge base and
reference standard block are dry and free of debris.
Choose a standard count site that meets the following criteria:
♦
A smooth surface such that the reference standard block 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
♦
On asphalt, concrete, or compacted soil at least 10 centimeters
(4 in.) thick
Turn the gauge on. At the Ready display, press the 〈STD〉 key. The
gauge displays the last standard counts for density (DS) and
moisture (MS).
NOTE
The 〈STD〉 key is active only when the Ready screen is
displayed.
To take a new standard count, press 〈YES〉 and follow the
instructions in the
New Standard Count section that follows.
To view the last four standard counts, press 〈NO〉 and follow the
instructions in the
View Standard Counts section on page 4–6.
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