24 research outputs found
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Groundwater clean-up: The Savannah River Site experience
Protection of the Earth's valuable resources is of great concern to the public in relation to safety and health. One of the resources receiving extensive attention is groundwater. Past waste disposal practices have impacted groundwater quality in many locations throughout the nation. In response, the Federal Government has passed legislation to protect and restore the environment. In many cases, application of this legislation has lead to strict clean-up standards. Savannah River Site (SRS) experiences suggest that meeting clean-up standards is a challenge in light of technical realities. The purpose of this paper is to describe the corrective action program that is addressing a plume of volatile organics beneath the A/M Area of the SRS. The history and status of the program, costs, measures of performance, lessons learned, and challenges faced are presented
Reef fishes captured by recreational spearfishing on reefs of Bahia State, northeast Brazil
Social Goal Orientations, Interpersonal Stress, and Depressive Symptoms Among Early Adolescents in Japan: A Test of the Diathesis-Stress Model Using the Trichotomous Framework of Social Goal Orientations
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The application of neutron radioscopy to lithium-aluminum alloy target elements
We have shown that neutron radioscopy is very useful in locating the position of a Li-Al alloy core enriched in lithium-6 in tubular aluminum target elements. The alloy core is displaced during a forming process and its location must be redetermined before processing can be completed. The Army's low-flux mobile neutron radioscopy system was employed in these studies as a model system for possible on-line, in-plant use. A series of core end sections of target tubes containing from 0.1 to 4.6 grams of lithium-6 per foot of length were examined radioscopically with thermal neutrons. The system was able to determine the extent of lithium alloy core from the highest concentrations down to about 0.2 grams of lithium-6 per ft within one minute of data collection time. A marked loss of sensitivity below this level could be recovered by providing higher geometrical resolution in the images obtained or by using image enhancement techniques. Film radiography was used to verify the accuracy of radioscopic determinations at the lowest lithium concentrations. 7 refs., 6 figs., 1 tab