Determination of uranium in immersion liquid of demolition waste using total reflection X-ray fluorescence analysis

X‐ray fluorescence analysis of samples simulating blood collected from uranium‐contaminated wounds

“…The peak widths, w = 0.313, 0.287, and 0.299 keV for the U Lα, Rb Kα, and Br Kβ peaks, respectively, were obtained by long‐duration measurements of standard solutions for each element, which were performed separately. As described in our previous study, the fixing of the peak width makes the fitting easy. Note that the relationship between w and the full width at half maximum (FWHM) of the peak is given as .…”

Trace determination of uranium preconcentrated using graphene oxide by total reflection X‐ray fluorescence spectrometry

“…Because the energy of the U L III threshold (17.17 keV) is a little lower than that of the Mo Kα line, the intense Mo Kα line can efficiently excite uranium. Because the intensity of the In Kα peak, which was used as an internal standard in our previous studies, is thought to be low, gallium, which can be excited by the intense Mo Kα line, was employed as the internal standard in the present study. Unlike the portable TXRF device used in our previous studies, the glancing angle of an incident X‐ray to the sample is variable and set to 0.05°.…”

“…Because the intensity of the In Kα peak, which was used as an internal standard in our previous studies, is thought to be low, gallium, which can be excited by the intense Mo Kα line, was employed as the internal standard in the present study. Unlike the portable TXRF device used in our previous studies, the glancing angle of an incident X‐ray to the sample is variable and set to 0.05°. A 50‐mm 2 silicon drift detector with a resolution of 142.5 eV at 17.5 keV (Mo Kα) was placed just above the sample to efficiently observe X‐ray fluorescence.…”

“…These TXRF analyses were performed using large‐scaled instruments with high‐power X‐ray tubes (operated with 1,100 or 1,200 W), demanding water‐cooling systems and silicon drift detectors. Recently, a portable TXRF spectrometer (no cooling media or gas consumption are required for operation) is available to detect uranium in drainage water . Generally, XRF analysis of a heavy element is performed using L‐lines overlapping with K‐lines of light elements.…”

“…Rubidium exists widely in nature, including soil and seawater. To remove rubidium's contribution from the TXRF spectrum, two methods were proposed in our previous studies . Peak deconvolution using Gaussian functions with fixing of peak widths using established measurements of standard solutions is useful to separate the U Lα and Rb Kα peaks when rubidium concentration is comparable to uranium concentration in the sample solution.…”