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Depleted uranium (DU) armor-penetrating
munitions are used on testing
and training ranges leading to elevated concentrations of U in range
soils. To prevent exposure from secure areas contaminated with DU
hotspots, easy and rapid screening methods are needed. This study
explores the feasibility of field-portable X-ray fluorescence (FPXRF)
spectrometry as a fast screening tool for locating hotspots of DU
in the field. Direct comparisons of results were made for U concentrations
in the soil obtained using FPXRF spectrometry and measurement of U
using inductively coupled plasma mass spectrometry (ICP–MS)
after acid digestion. The environmental samples included both field-range
contaminated soils collected at a munition testing facility and soils
spiked with uranium dioxide, uranium trioxide, and uranyl nitrate.
Using U concentrations measured with ICP–MS from split samples,
FPXRF operating procedures and conditions such as analysis time, soil
moisture content, sample amount, and sample packing factors were optimized.
Results showed that the FPXRF technique yielded similar U concentrations
as ICP–MS measurements after acid digestion in both standard
soil (NIST) samples and DU-contaminated range soils. In field-contaminated
soils, U values with FPXRF were 88.8% of the measurements with ICP–MS
with a significant correlation (R
2: 0.98, n = 8). Sample preparation affected the uranium concentration
measurements made with FPXRF in the laboratory and in the field. A
loose packing of the samples in the sample containers, higher sample
occupancy, and low soil moisture yielded significantly higher U concentrations
by 4–5, 15–50, and 43%, respectively. The measured soil
U concentrations were not affected by the variation of the sample
analysis time. This study suggests that FPXRF is a promising fast
screening tool for field DU hotspots as well as detection/location
of penetrators in the fields that can increase the ability to rapidly
and inexpensively manage DU on ranges and help ensure sustainable
use of DU munitions on testing and training ranges.
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