Moisture – The moisture source has a half-life of 430 years and
the reduction in moisture precision is insignificant over the life of
the gauge.
As mentioned in the previous sections of this manual, there are
two assumptions made in the measurement of moisture by
neutron method. First is that any interaction between the
source and material is due to interaction with hydrogen in the
form of water. Second, that there are no elements that absorb
neutrons. However, in construction type soils, boron in some
soils, chlorine in coastal soils, and iron oxide in deposits can be
encountered in sufficient concentration to affect the readings.
Also, variation in bound hydrogen in clay soils can cause
significant errors in gauge moisture readings and have to be
corrected for under the offset functions in the MENU.
Gauge software contains offset features to account for some of
these errors in the reading. Refer to the Menu functions for
more details on how to correct your gauge readings using
offset functions.
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