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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Plastic does indeed have a different calibration than aluminium or steel. - get in touch privately and we can discuss it . [and then post a summary for the benefit of all sowacsers please Ed, thanks Bruce] cliff.hignett@soilwater.com.au owner-sowacs@aqua.ccwr.ac.za wrote: > Dear Sowacsers, > > I am a PhD student at the University of Leeds, England. I have been > researching the ability of ground-penetrating radar (GPR) to detect > leaks from water supply pipes. At my field site, I have installed 4 > neutron probe access tubes and obtained a suite of data from a study > leak in order to monitor soil water content changes after leak water is > introduced into the soil. > > The access tubes had to be plastic as metal tubes would interfere with > the electromagnetic equipment we use at the site. I am seeking advice on > calibration techniques. I am looking at moisture changes in short time > period: the leak is relatively high magnitude and so tests only last ~ > 2-4 hours because the ground becomes saturated). Therefore I wondered > what people thought about the importance of calibration when the > difference in control and leak data is of primary concern to my work. > > Regards > Ed O'Brien > ---------------------- > Edward O'Brien > School of Geography > University of Leeds > Leeds LS6 1LP > Tel: 0113-233-6638 > Fax: 0113-233-3308 > ---------------------- -- Mr Cliff Hignett 45a Ormond Ave Daw Park South Australia 5041 cliff.hignett@soilwater.com.au