New Method for Phase Investigation on Abandoned Waste Sites

Until recently, no measuring method was available, which clearly distinguished between these two conditions. Even the neutron-neutron logging, established in the fields of well examination or exploration of deposits, was insufficient because of the limited radiation sources. The results of this research project was the successful application of the newly developed impulse neutron-neutron logging for the detection of dissolved pollutants and pollutants present in phases, such as BTEX, mineral oils and volatile halogenated hydrocarbons. The depth dependent measurements in conjunction with the instant graphical evaluation enabled a flexible and efficient phase and plume investigation and monitoring. The measurements require an inner diameter of approximately 40 mm of the well or canal. For the first time, BTEX, mineral oils, and volatile halogenated hydrocarbons, which are present in complex contaminations, can be detected as dissolved in water or being present in phase. For financial support, we thank the German Federal Ministry for Economics and Tech-nology.