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Tree-core and wood sample locations and their proximity to SSFL. Sage Ranch Park and Upper Las Virgenes Canyon were used to create the chronology.

Tree-core and wood sample locations and their proximity to SSFL. Sage Ranch Park and Upper Las Virgenes Canyon were used to create the chronology.

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The Santa Susana Field Laboratory (SSFL) was a nuclear reactor development, rocket, and missile testing facility built ~48 km (30 miles) northwest of downtown Los Angeles in Simi Valley, CA. For two weeks in July of 1959, highly radioactive material was potentially emitted into the atmosphere following a secret nuclear incident. The partial meltdow...

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... lobata, Q. kelloggii, and Q. agrifolia trees were chosen because of their age longevity, abundance, proximity to SSFL, and potential of wood to store radionuclides (Brownridge, 1984;Momoshima and Bondietti, 1994;Zhiyanski et al., 2010). Permission for tree-core extracting and collection of wood samples was granted by the Santa Monica Mountains National Recreation Area for three different sites that surround SSFL (Figure 4) For each tree, 2-4 tree-cores were collected for cross-dating. A 5 mm (.2 inch) wide increment borer was used at breast height (Speer, 2010). ...