New developments in target preparation at CBNM: laser evaporation-condensation and electrolysis

doi:10.1016/0168-9002(93)90537-R

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 334, Issue 1, 15 September 1993, Pages 122-125

https://doi.org/10.1016/0168-9002(93)90537-R Get rights and content

Abstract

Preliminary laser evaporation-condensation experiments were performed to check the quantitative deposition of lithium fluoride and uranium oxide. The homogeneity of the deposits on stainless steel backings was investigated. Interaction of polyimide foils with the laser beam was also observed. Electrodeposition of uranium and plutonium on gold-coated polyimide foils was investigated in aqueous and organic media.

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Cited by (3)

Actinide target preparation at IRMM-then and now
2010, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Since the beginning of its activity IRMM (originally CBNM, Central Bureau for Nuclear Measurements) was engaged in measurements of parameters relevant to nuclear energy. High-purity samples and targets of radioactive materials required for measurements of cross-sections and studies of fission fragments or fuel elements were prepared by the IRMM's target group by means of various techniques reviewed in this presentation. Applying these techniques the target group had been preparing targets of U, Pu, Np, Am, Th for in-house physicists and for external customers.
Recently, after a long process of decontamination and refurbishment of the old equipment, custom-made ²³³U and ²³⁵U targets were prepared by electro-deposition and by high-vacuum evaporation. Other actinide targets (U, Th) have been prepared using mechanical reshaping techniques.
Improved electrodeposited actinide layers
1997, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Electrodeposition is a relatively simple and high-yielding method for producing actinide layers for nuclear targets. A new design of the cell has been used to deposit U, Pu, Np and Am onto metallic backings from isopropanol and onto carbon-coated polyimide films from isobutanol. The current density was 1–3 mA/cm². Deposition yields, determined by low geometry alpha-particle counting, were about 65% for Pu and about 90% for other elements. The same technique was used to investigate thickness homogeneity of ²³⁹Pu deposits, and it was observed that targets with mean thickness up to about 100 μg/cm² were thicker in the centre than at the edge, but for targets above 100 μg/cm², this profile was reversed. Modifications to the electrode shape were made in an attempt to improve the thickness uniformity.
New aspects of thin polyimide foils
1995, Nuclear Inst. and Methods in Physics Research, A
A series of thin polyimide foils (16–115 μg/cm²) were prepared in a glove-box under a controlled, dry atmosphere. Strengths, as defined by the Chen rupture coefficient, were measured and compared with previously published values for foils prepared at about 25% relative humidity and were found to be about 50% higher over the whole thickness range investigated. The use of a glove-box therefore permits the preparation of stronger foils, independent of weather conditions (relative humidity) and with the added advantage of dust-free conditions.
The resistivity of thin carbon layers on polyimide foils was measured for carbon deposits prepared by electron beam evaporation and by laser plasma ablation. The use of such carbon coated polyimide foils as the cathode in an electrodeposition process was investigated.

^∗: From January 1993: Institute for Reference Materials and Measurements — IRMM.

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

New developments in target preparation at CBNM: laser evaporation-condensation and electrolysis

Abstract

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Nucl. Instr. and Meth.

Actinide target preparation at IRMM-then and now

Improved electrodeposited actinide layers

New aspects of thin polyimide foils