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To determine the apparent in place or "wet" density the Troxler <br />gauge employs an 8 mCI Cesium gamma emitting source coupled with a <br />Geiger-Mueller scintillometer detector tube. In direct transmission <br />mode, (Fig. 1) the detector records the amount of radiation <br />received over a measured amount of time. The amount of radiation <br />detected can be directly related to the density of the material by <br />the microprocessor. The gauge is calibrated against a polyethylene <br />Fig. 1 <br />standard block before every use. These calibration numbers are <br />tracked and correction factors are adjusted as the source decays. <br />The in place density readings given by the Troxler are affected <br />very little by the material being tested as long as the density of <br />the material being tested lies within the original calibration <br />range of the instrument. The refuse pit density lies within the <br />original calibration range. Therefore the in place or "wet" density <br />readings can be considered as reliable and accurate. <br />To determine moisture in a sample the Troxler gauge uses a 40 mCI <br />Americium Beryllium neutron source. Neutrons are not normally <br />2. <br />