Radiant energy – Geological testing or irradiation
Patent
1980-06-16
1982-12-21
Willis, Davis L.
Radiant energy
Geological testing or irradiation
2504591, 2504611, G01V 500
Patent
active
043651534
ABSTRACT:
We have discovered that certain photoluminescent minerals of zinc, fluorine, tungsten, molybdenum, mercury and other elements which may naturally occur at the surface of the earth can be selectively detected in the presence of most other photoluminescent minerals and organic materials which are likely to occur at the earth's surface. The basis of selective detection is the discovery that the lifetimes of photoluminescent emission of materials in the latter class are much shorter than the lifetimes of photoluminescent emission of materials in the former class. This invention utilizes this discovery in the detection of minerals of uranium, zinc, lead, fluorine, tungsten, molybdenum, mercury and other elements. In one embodiment of the invention, using a laser or other short duration source of optical excitation, measurements of the photoluminescent response of the earth are made at times sufficiently long for the photoluminescence of other common and unwanted sources to have substantially decayed, thereby selectively detecting and identifying certain minerals of potential economic interest. In another embodiment a source of light is modulated at a predetermined frequency and the photoluminescent response of the earth which is out-of-phase with the source is measured. In a third embodiment this source of light may be incident solar radiation after passage through a suitable modulator.
REFERENCES:
patent: Re25320 (1963-01-01), Lewis et al.
patent: 2987620 (1961-06-01), Lewis et al.
patent: 3043908 (1962-07-01), Madsen
patent: 3663814 (1972-05-01), Madsen
patent: 3666945 (1972-05-01), Frungel et al.
patent: 3736428 (1973-05-01), Monroe
patent: 3886363 (1975-05-01), Ohnishi et al.
patent: 4236071 (1980-11-01), Chimenti
Bennett, Instrument to Measure Fluorescence Lifetimes in the Millimicrosecond Region, pp. 1275-1279.
Benson et al., Concentration and Temperature Quenching of the Excited State of the Uranyl Ion in Aqueous Solution by Laser Flash Photolysis, pp. 195-197.
Yokoyama, Election Transfer Mechanism in Quenching of Uranyl Luminescence by Halide Ions, pp. 1329-1333.
Robbins John C.
Seigel Harold O.
Scintrex Limited
Willis Davis L.
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