Trace characterization of tantalum by NAA involving pre- and post-irradiation separations

Caletka, R.; Hausbeck, R.; Kriváň, V.

doi:10.1007/bf02037346

Cited by 16 publications

(3 citation statements)

References 22 publications

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“…Carbon and sulfur are determined by combustion analysis, and oxygen and nitrogen by hot extraction with a carrier gas. ment -matrix separation offers the possibility to overcome the problems [135,137,138]. For the final determination, ICP-AES, ICP-mass spectrometry, or neutron activation analysis are used.…”

Section: Discussionmentioning

confidence: 99%

Tantalum and Tantalum Compounds

Andersson¹,

Reichert²,

Wolf³

2000

Ullmann's Encyclopedia of Industrial Chemistry

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Section: Discussionmentioning

confidence: 99%

Tantalum and Tantalum Compounds

Andersson¹,

Reichert²,

Wolf³

2000

Ullmann's Encyclopedia of Industrial Chemistry

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“…analysis of molybdenum can be achieved only by an effective separation of the molybdenum and technetium matrix radionuclides from the indicator radionuclides. The experience we have gathered with anion-exchange behavior of elements from HF-based media under static and dynamic conditions and its utilization for analysis and/or determination of refractory metals (35)(36)(37)(38)(39)(40)(41)(42)(43)(44) suggests that this separation system could be an adequate approach also for the solution of this analytical task.…”

Section: Introductionmentioning

confidence: 99%

Determination of uranium, thorium, and 18 other elements in high-purity molybdenum by radiochemical neutron activation analysis

Theimer¹,

Kriváň²

1990

Anal. Chem.

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A radlochemkai neutron acthratlon analysis technlque for the determination of uranium and thorium In high-purity molybdenum via the lndlcator radionuclides 290Np for U and 23sPa for Th has been developed. S k n u l t a w , the ebments Ag, Co, Cr, Cs, Cu, Fe, Ga, In, Ir, K, Mn, Na, NI, Rb, Ru, Sc, Se, and Zn can be determined, too. The elements Hf, Sb, Ta, Sn, and W were determined by instrumental neutron activation analysis. The radloclremical separatlon Is pertormed by anion exchange on a Dowex 1 X 8 column from a 20 M HF/3% H,02 medlum. A h i t of detection of 4 ng/g for uranium and 40 pg/g for tholkwn can be achleved. For the other elements, the limns of detection are between 1 pg/g and 100 ng/g. A m o d W more seiectlve separatlon of the Indicator radlonuelide of Th, =Pa, alkws improvement d the lknit d detecth for Th by a factor up to 5. Thls technique was appHed lo the analysis of high-purity molybdenum, and the results of a number of elements were compared with those of other technlques.

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“…9 Even so, GDMS cannot be applied to non-conducting materials such as tantalum(V) oxide or tantalum pentaethoxide, and NAA needs a nuclear reactor for neutron flux to irradiate the samples. 10,11 Since increased demands of highly-purified tantalum materials are expected in the future, the development of analytical methods for the determination of impurity elements below the ng/g level is really required in the semiconductor industry.…”

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confidence: 99%