Radiant energy – Invisible radiant energy responsive electric signalling – Neutron responsive means
Patent
1991-02-15
1992-09-29
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Neutron responsive means
25039005, G01N 2309
Patent
active
051516012
ABSTRACT:
Method and apparatus for determining the asphalt content of a bituminous paving mix wherein Marshall plug samples of the bituminous paving mix are subjected to a neutron source and the neutrons that are thermalized by hydrogen nuclei present in the Marshall plug sample are detected and counted to provide an indication of the asphalt content of the sample. A neutron moderating substance, such as a polyethylene sample holder having receptacles for closely fitting the Marshall plug samples, is included with the sample pan to increase the number of thermalized neutrons resulting from the interaction of neutrons with hydrogen nuclei present in the sample.
REFERENCES:
patent: 3492479 (1970-01-01), Lowery et al.
patent: 4164655 (1979-08-01), Noma et al.
patent: 4499380 (1985-02-01), Aggour et al.
patent: 4864842 (1989-09-01), Regimand
patent: 4874950 (1989-10-01), Regimand
Freeman, Thomas E. et al., Engineering Report--Asphalt Content Determination of Marshall Specimens by The Nuclear Method, Sep. 1985, Department of Civil Engineering, Clemson University.
Fields Carolyn E.
Troxler Electronic Laboratories, Inc.
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