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The Model 3241 Series gauges can quickly and precisely
determine the asphaltic cement (or bitumen) content of an
asphalt-aggregate mix without the use of volatile or hazardous
chemicals. Using the proven principle of neutron thermalization,
the gauge determines asphalt content. Hydrogen in the asphalt
slows neutrons emitted from an Americium-241:Beryllium
source. A series of Helium-3 detectors located in the base detects
the slowed neutrons and the gauge converts the count into a
precise measurement of asphalt content.
The gauge may be calibrated to accommodate different mixes
and the calibrations may be transferred to other gauges. The
sample temperature is always monitored allowing the gauge to
compensate for variations which have been known to cause
problems in other gauges.
The nuclear method of asphalt content testing has been
approved by the American Society of Testing and Materials
(ASTM) and the Model 3241 Series gauges meet or exceed all the
requirements of ASTM D-4125-10, Standard Test Method for the
Asphalt Content of Bituminous Mixtures by the Nuclear Method.
Owners are encouraged to require study of this manual by
operator(s) before allowing any use of the instrument. While no
radiation hazard exists for operator(s) during normal use, a
potential hazard does exist if improperly used. The sections of
the manual covering radiological safety should be required
reading for all operators and potential operators. If these
sections are not completely understood, seek assistance from a
Troxler representative. Additional nuclear safety information is
available in the Troxler Nuclear Gauge Safety training course. Visit
our website at www.troxlerlabs.com
for more information.
As changes are made to local, state and federal regulations on a
continuing basis, the owner/user must maintain a current status
with these regulations. The responsibility for compliance
ultimately falls upon the owner. The owner may also wish to
purchase and subscribe to Titles 10 and 49 of the Code of Federal
Regulations in addition to applicable local/state regulations.
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