Electro-Precipitation of Actinides on Boron-Doped Diamond Thin Films for Solid Sources Preparation for High-Resolution Alpha-Particle Spectrometry

Abstract

In this work, we investigate a novel approach to prepare high-performance alpha-particle solid sources fabricated on diamond thin support layers, offering the properties of diamond such as a low-Z material with corrosion and mechanical hardness. As-prepared solid sources onto boron-doped-diamond (BDD) substrate exhibited high performance of the autoradiography and spectroscopic resolution at the level of other more conventional materials such as stainless steel. A straightforward precipitation process in the Na2SO4 or NaNO3 simple electrolytes under mild experimental conditions with a low current of several mA.cm−2 were successfully developed onto BDD substrates for deposition of single 241Am as well as 239Pu, 241Am, and 244Cm mixed radionuclides. The results demonstrate that solid sources deposited onto such BDD substrates can match the performance of those prepared onto stainless steel substrates with excellent uniformity and high-resolution spectroscopy, together combining the robustness, chemical resilience, and X-ray transparence of the diamond. Alpha-particle spectra exhibiting a low full width at half maximum (FWHM) of 12.5 keV at the energy of 5.485 MeV (241Am) could be practically obtained for BDD substrates.

Determination of 241Am in Environmental Samples: A Review

“…It was observed that, when Fe(III) concentrations >0.1 mM (~30 µg Fe) were found in NH 4 Cl solution (5 mL), only 6% of the 241 Am could be electrodeposited [ 116 ]. A variety of electrolytes or buffers have been employed for 241 Am electrodeposition, such as oxalic acid-NH 4 Cl solution [ 115 ], NaHSO 4 -Na 2 S 2 O 4 buffer [ 117 ], H 2 SO 4 -(NH 4 ) 2 SO 4 buffer [ 53 , 84 ], Na 2 SO 4 [ 118 ], NaHSO 4 -H 2 SO 4 -NH 4 OH buffer [ 119 ], NH 4 Cl [ 116 ], (NH 4 ) 2 C 2 O 8 -hydroxyl ammonium sulfate-DTPA [ 120 ], and (NH 4 ) 2 C 2 O 8 -(NH 4 ) 2 SO 4 -DTPA [ 121 ]. Among these electrolytes, the NaHSO 4 -Na 2 S 2 O 4 buffer solution is regarded as the most robust because the electrolyte can be pre-adjusted to an optimal pH, and no further adjustment is needed in the process.…”

Flow Injection Electrochemical Quartz Crystal Microbalance with ICP-OES Detection: Electroprecipitation and Stripping of Lanthanum and Neodymium in a Flow Cell

“…However, neither electroprecipitation nor stripping from electrodes in small flow cells has been attempted as a preconcentration step before detection. Such a technique would be vital for new systems under study that rely on electrodeposited films, such as in situ alpha spectrometers 11,13 or X-ray fluorescence (XRF) sensors, 14 that can be miniaturized and made portable.…”