Determination of Uranium Dioxide in Stainless Steels by the X-ray Fluorescence-Solution Method

AbstractThis paper outlines a rapid method for the determination of uranium dioxide in stainless steel by direct X-ray fluorescence analysis after chemical solution of the sample in perchloric acid. A scintillation counter is used to detect the intensity of the radiation. Modifications in the apparatus needed to insure stabilization of the counter are described. Strontium is used as internal indicator. The determination of uranium is unaffected by the presence of large amounts of iron, chromium or nickel at the dilutions described. The counting time for four pairs of counts (uranium and strontium) is about 12 minutes.A standard deviation corresponding to one-half to one per cent of the uranium dioxide present was observed on synthetic samples ranging from 15 to 25% uranium dioxide.

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Determination of Iron, Chromium, and Nickel by Fluorescent X-Ray Analysis. Aqueous Solution Method

Analytical Chemistry ◽

10.1021/ac60150a037 ◽

1959 ◽

Vol 31 (6) ◽

pp. 1069-1072 ◽

Cited By ~ 17

Author(s):

W. W. Houk ◽

Louis. Silverman

Keyword(s):

Aqueous Solution ◽

Solution Method ◽

X Ray ◽

Aqueous Solution Method ◽

Iron Chromium

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X-Ray Spectrographic Determination of Uranium and Plutonium in Aluminum and Other Reactor Fuel Materials

Advances in X-ray Analysis ◽

10.1154/s0376030800000513 ◽

1958 ◽

Vol 2 ◽

pp. 193-213

Author(s):

Maurice C. Lambert

Keyword(s):

Uranium Dioxide ◽

Internal Standard ◽

Reactor Fuel ◽

Spectrographic Determination ◽

X Ray ◽

Counting Time ◽

Powder Samples ◽

Enriched Uranium ◽

X Ray Absorption

AbstractSeveral instrument modifications are described including a shop-built turret mount which provides four water-cooled sample compartments, each accommodating samples up to 1.75 inches in diameter by 1.75 inches long.Sensitivity for detection of the elements throughout the Periodic Chart is discussed for several counters.Uranium and plutonium have been determined up to 20 w/o in metallic samples of aluminum alloys with a precision of ± one per cent in less than three minutes counting time. The determination of uranium dioxide in cryolite involved powder samples and the use of an internal standard. Uranium dioxide dispersions in bismuth metal were very heterogeneous; they were dissolved and precipitated to provide homogeneous, powders which were analyzed by measuring the intensity ratio of uranium and bismuth fluorescence.X-ray fluorescence has been used to measure aluminum cladding thickness over plutonium alloy cores. Precision is discussed in terms of cladding thickness, aperture size, and counting time. Thickness of 11 w/o and 14 w/o plutonium-aluminum and enriched uranium-aluminum cores in reactor fuel plates has been measured by X-ray absorption in the range 0.010 to 0.030 inch with a sensitivity of ± 0.00025 inch.

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IMPROVEMENT OF THE SAMPLE PREPARATION IN DETERMINATION OF THE MICROELEMENT COMPOSITION OF BROWN ALGAE USING X-RAY FLUORESCENCE ANALYSIS WITH TOTAL EXTERNAL REFLECTION

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2017-83-12-12-20 ◽

2017 ◽

Vol 83 (12) ◽

pp. 12-20

Author(s):

A. V. Malkov ◽

A. Yu. Kozhevnikov ◽

T. M. Konstantinova ◽

D. S. Kosyakov ◽

A. E. Parshina

Keyword(s):

Sample Preparation ◽

Brown Algae ◽

Fluorescence Analysis ◽

Total External Reflection ◽

X Ray ◽

Microelement Composition

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Sorption of Se (IV) from aqueous solutions with subsequent determination by X-ray fluorescence analysis

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2020-86-10-5-9 ◽

2020 ◽

Vol 86 (10) ◽

pp. 5-9

Author(s):

D. G. Filatova ◽

A. A. Arkhipenko ◽

M. A. Statkus ◽

V. V. Es’kina ◽

V. B. Baranovskaya ◽

...

Keyword(s):

Inductively Coupled Plasma ◽

Fluorescence Analysis ◽

Standard Samples ◽

Phase Contact Time ◽

Sorbent Phase ◽

X Ray ◽

Fundamental Parameters ◽

Inductively Coupled ◽

Subsequent Determination

An approach to sorptive separation of Se (IV) from solutions on a novel S,N-containing sorbent with subsequent determination of the analyte in the sorbent phase by micro-x-ray fluorescence method is presented. The sorbent copolymethylenesulfide-N-alkyl-methylenamine (CMA) was synthesized using «snake in the cage» procedure and proven to be stable in acid solutions. Conditions for quantitative extraction of Se (IV) were determined: sorption in 5 M HCl or 0.05 M HNO3 solutions when heated to 60°C, phase contact time being 1 h. The residual selenium content in the solution was determined by inductively coupled plasma mass spectrometry (ICP-MS) using 82Se isotope. The absence of selenium losses is proved and the mechanism of sorption interaction under specified conditions is proposed. The method of micro-x-ray fluorescence analysis (micro-RFA) with mapping revealed a uniform distribution of selenium on the sorbent surface. The possibility of determining selenium in the sorbent phase by micro-RFA is shown. When comparing the obtained results with the results of calculations by the method of fundamental parameters, it is shown the necessity of using standard samples of sorbates to obtain correct results of RFA determination of selenium in the sorbent phase.

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