Radiant energy – Invisible radiant energy responsive electric signalling – Neutron responsive means
Patent
1991-07-31
1996-08-06
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Neutron responsive means
250391, G01N 23204
Patent
active
055436234
ABSTRACT:
This technique for detecting underground contamination by organic fluids employs a plurality of spaced-apart boreholes adjacent a region to be tested for contamination. A neutron backscatter gauge is introduced into each of the boreholes for measuring the concentration of hydrogen in the soil surrounding the borehole. Such measurements are made at a plurality of spaced elevations along such a borehole and the distribution of hydrogen concentration as a function of elevation is compared with the expected distribution of hydrogen from underground sources of hydrogen, for distinguishing organic fluid contamination from other sources of hydrogen. For example, one can distinguish buried concrete or underground water from organic contamination. Measurements can also be made using chemical analysis methods. In another embodiment, the invention is used to profile and affect biodegradation. A plurality of spaced apart boreholes are provided in the buried material (for example, dump site). Hydrogen concentrations are measured over a period of time. Substantially unchanging hydrogen concentration in a region would indicate lack of aerobic degradation. Biodegradation can also be evaluated by monitoring the concentration of other biodegradation products. Changes in the biodegradation rate may be affected by injecting material into the region.
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patent: 5264349 (1993-11-01), De Baere
Blakely David
Everett Lorne G.
Fields Carolyn E.
TTI Environmental Inc.
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