National geophysical data grids; gamma-ray, gravity, magnetic, and topographic data for the conterminous United States

Phillips, Jeffrey D.; Duval, Joseph S.; Ambroziak, Russell A.

doi:10.3133/ds9

Cited by 45 publications

(22 citation statements)

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“…For both sets of measurements, the ADM-300 reported approximately twice the mean exposure rates recorded by the 451P of 12 and 12.5 µR h −1 for indoor and outdoor measurements. The 12.5 µR h −1 exposure rate is similar to the combined cosmic and terrestrial exposures expected for Albuquerque, NM (Gollnick, 1988;Phillips et al, 1993). Based on this information, there is an expectation that measurements made with the ADM-300 and AN/PDR-77 at low external radiation dose levels will be biased toward higher results.…”

Section: Mext External Radiation Monitoring Stations In Tokyo and Kanmentioning

confidence: 51%

Radiation Dose Assessments for Shore-Based Individuals in Operation Tomodachi, Revision 1

Cassata¹,

Falo²,

Rademacher³

et al. 2012

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This report provides the radiation dose assessments for the Department of Defense shore-based population of interest that was potentially exposed to radioactive fallout resulting from the Fukushima Daiichi nuclear power station units' radiological releases that followed the earthquake and tsunami on March 11, 2011. The associated Department of Defense disaster relief operation to the citizens of Japan was entitled, "Operation Tomodachi." Finalized radiation dose assessments for the population of interest should be loaded into an Operation Tomodachi Registry by the end of 2012, which will support public inquiries.

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Section: Mext External Radiation Monitoring Stations In Tokyo and Kanmentioning

confidence: 51%

Radiation Dose Assessments for Shore-Based Individuals in Operation Tomodachi, Revision 1

Cassata¹,

Falo²,

Rademacher³

et al. 2012

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“…Uranium is naturally abundant in sediments in the ESJV, which are derived from granitic rocks of the Sierra Nevada. Aerial gamma‐ray surveys of U in the ESJV show that U concentrations in surficial sediments range from 1.22 to 4.20 ppm and average about 3 ppm (Phillips et al 1993). In contrast, surficial sediments of the conterminous United States have an average U concentration of 1.83 ppm.…”

Section: Resultsmentioning

confidence: 99%

“…Uranium is naturally abundant in sediments in the ESJV, which are derived from granitic rocks of the Sierra Nevada. Aerial gamma-ray surveys of U in the ESJV show that U concentrations in surficial sediments range from 1.22 to 4.20 ppm and average about 3 ppm (Phillips et al 1993 supply are also derived from the granitic rocks of the Sierra Nevada, it is probable that the concentration of U in aquifer sediments is similar to the concentrations in surficial sediments. However, the amount of U that may be easily mobilized is typically only a small fraction of the total U content of the sediment.…”

Section: Uranium Mobilization Source Of Uraniummentioning

confidence: 99%

Effects of Groundwater Development on Uranium: Central Valley, California, USA

et al. 2010

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Uranium (U) concentrations in groundwater in several parts of the eastern San Joaquin Valley, California, have exceeded federal and state drinking water standards during the last 20 years. The San Joaquin Valley is located within the Central Valley of California and is one of the most productive agricultural areas in the world. Increased irrigation and pumping associated with agricultural and urban development during the last 100 years have changed the chemistry and magnitude of groundwater recharge, and increased the rate of downward groundwater movement. Strong correlations between U and bicarbonate suggest that U is leached from shallow sediments by high bicarbonate water, consistent with findings of previous work in Modesto, California. Summer irrigation of crops in agricultural areas and, to lesser extent, of landscape plants and grasses in urban areas, has increased P co 2 concentrations in the soil zone and caused higher temperature and salinity of groundwater recharge. Coupled with groundwater pumping, this process, as evidenced by increasing bicarbonate concentrations in groundwater over the last 100 years, has caused shallow, young groundwater with high U concentrations to migrate to deeper parts of the groundwater system that are tapped by public-supply wells. Continued downward migration of U-affected groundwater and expansion of urban centers into agricultural areas will likely be associated with increased U concentrations in public-supply wells. The results from this study illustrate the potential longterm effects of groundwater development and irrigation-supported agriculture on water quality in arid and semiarid regions around the world.

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“…(a) Complete Bouguer gravity anomaly map of the Yellowstone area showing structural, hydrothermal, volcanic, geophysical and seismological features [ Phillips et al , 1993]. The solid thick contour marks the boundary of the Yellowstone National Park.…”

Section: Introductionmentioning

confidence: 99%

Mushy magma beneath Yellowstone

Chu

Helmberger

Sun

et al. 2010

Geophysical Research Letters

101

111

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[1] A recent prospective on the Yellowstone Caldera discounts its explosive potential based on inferences from tomographic studies which suggests a high degree of crystallization of the underlying magma body. In this study, we show that many of the first teleseismic P-wave arrivals observed at seismic stations on the edge of the caldera did not travel through the magma body but have taken longer but faster paths around the edge. After applying a number of waveform modeling tools, we obtain much lower seismic velocities than previous studies, 2.3 km/sec (V p ) and 1.1 km/sec (V s ). We estimate the physical state of the magma body by assuming a fluid-saturated porous material consisting of granite and a mixture of rhyolite melt and water and CO 2 at a temperature of 800°C and pressure at 5 km (0.1 GPa). We found that this relatively shallow magma body has a volume of over 4,300 km 3 and is about 32% melt saturated with about 8% water plus CO 2 by volume.

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National geophysical data grids; gamma-ray, gravity, magnetic, and topographic data for the conterminous United States

Cited by 45 publications

References 0 publications

Radiation Dose Assessments for Shore-Based Individuals in Operation Tomodachi, Revision 1

Radiation Dose Assessments for Shore-Based Individuals in Operation Tomodachi, Revision 1

Effects of Groundwater Development on Uranium: Central Valley, California, USA

Mushy magma beneath Yellowstone

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