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G-tek has an extensive library of research and information papers which can be browsed for more detailed information about our technologies, methodologies and equipment. | ||
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UNEXPLODED ORDNANCE> | ||||
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The development of digital explosive ordnance detection technologies has for the first time made it possible to quantify and verify the performance of UXO detection. EOD has been transformed from a skilled art to a science.
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Conventional magnetic locators were analogue instruments. These have now been greatly outperformed by digital systems. Analogue locators rely on the operator watching a meter and listening to an audio tone as the sensing probe is systematically scanned across the survey area. These systems depend heavily on operator concentration and subjective judgements during the search. Digital magnetometers outperform their analogue predecessors in survey speed and detection performance. They verify the integrity of the search and enable a detection assurance level to be quantified.
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Between 1994 and 1999 the US Department of Defense spent $30m conducting an advanced technology demonstration program (the “Jefferson Trials”) to establish the “state-of-the-art” in UXO detection technology. G-tek’s performance in these trials was outstanding.
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From 1998 to 2001, the Montana National Guard conducted a 10% digital geophysical survey on a 210-acre site in the Limestone Hills, MontanaA total of 532 anomalies were validated on 87 grids in 30 days of fieldwork spanning five months. Of the 532 anomalies, 101 were intact ordnance - a false alarm rate of approximately 5:1.
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GEOLOGICAL MAPPING > | ||||
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The definition obtained from geophysics is inversely proportional to
the distance the sensors are from the geological structure of interest.
While large structures can often be detected from airborne surveys, the
detail obtained from G-tek’s ultra-high definition ground-based
surveys adds immeasurably to the understanding of the underlying geology – especially
the unweathered surface below sediments.
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While sills often can be identified from the routine (vertical) drilling
that precedes mine development, vertical drilling will rarely intersect
thin, vertical structures such as dykes, faults and small diameter pipes.
The particular challenge to G-tek was to develop a technology and cost-efficient
survey procedure that would deliver the sensitivity and spatial resolution
required to reliably identify the hazard of concern.
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A high definition technique has been developed for simultaneously mapping electrical and magnetic characteristics of the ground. Each of the parameters may be measured at sub-metre intervals while continuously traversing either on foot or in a vehicle. Electric current, typically in the sub-audio frequency range of 3-200Hz, is induced in the ground by either galvanic or electromagnetic means. An optically pumped total field magnetometer continuously measures the natural and synthetic field changes from DC to the highest transmitted frequency. Real-time spectral analysis of the magnetic field changes allows a suite of geophysical parameters to be derived.
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SUB SURFACE MAPPING > | ||||
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The use of G-tek’s SAM technology can be applied to a large variety of metallic and non-metallic underground pipes. SAM provides 100% detection of pipes where two ends are known, but the location is otherwise unknown. This applies to sewer, water, gas, electrical, telephone, petroleum and chemical pipes of any size and length.
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Almost all landfill contains a finite quantity of metallic cultural debris. Therefore, G-tek’s highly sensitive, high-definition ground-based geophysics can map the extent of many landfills and also show the potential density of metallic content.
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Copyright 2008 G-tek Australia Pty Limited |
