Megan Lee Lobaugh

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The uranium concentrations and isotopic compositions of waters, sediment leachates and sediments from Red Rock Creek in the Stanislaus National Forest of California were measured to investigate the transport of uranium from a point source (the Juniper Uranium Mine) to a natural surface stream environment. The ((234)U)/((238)U) composition of Red Rock Creek(More)
A single, large, bulk sample of uranium-contaminated material from the dirt floor of an abandoned metal rolling mill was separated into different types and sizes of aliquots to simulate samples that would be collected during site remediation. The facility rolled approximately 11,000 tons of hot-forged ingots of uranium metal approximately 60 y ago, and it(More)
A calibration phantom was developed at the University of Cincinnati (UC) to determine detection efficiency and estimate the quantity of activity deposited in the axillary lymph nodes of a worker who had unknowingly sustained a wound contaminated with 241Am at some distant time in the past. This paper describes how the Livermore Torso Phantom was modified(More)
Radioactive material deposited in multiple organs of the body is likely to confound a result of an in vivo measurement performed over the lungs, the most frequently monitored organ for occupational exposure. The significance of this interference was evaluated by measuring anthropometric torso phantoms containing lungs, liver, skeleton, and axillary lymph(More)
The Livermore Torso Phantom, the consensus calibration phantom for measuring internally deposited radioactive materials in the lungs, liver and tracheo-bronchial lymph nodes, has been modified for calibrating direct, in vivo measurements of Am in the axillary lymph nodes. The axillary lymph nodes may contain radioactive material mobilized from a wound in a(More)
Millions of children attending US schools are exposed to traffic-related air pollutants, including health-relevant ultrafine aerosols generated from school buses powered with diesel fuel. This case study was established in a midwestern (USA) metropolitan area to determine the concentration and elemental composition of aerosol in the vicinity of a public(More)
KHALAF AND colleagues compared MCNPX simulated measurement results for a homogeneous deposition and heterogeneous deposition of Am in the skeletal components of the knee (2013). The authors modeled the right leg of USTUR case 0864, representative of a 40-y-old skeletal deposition following chronic inhalation of an americium oxide for the non-homogeneous(More)
The detection efficiency and interference susceptibility of four different types of low energy photon detectors, each with a unique geometric arrangement, were compared for direct measurement of Am deposited in the axillary lymph nodes. Although the most efficient detector was a single large 23,226 mm square phoswich detector, it was also the most(More)
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