scholarly journals Actinide and Lanthanide Adsorption onto Hierarchically Porous Carbons Beads: A High Surface Affinity for Pu

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1464 ◽  
Author(s):  
Vittorio Luca ◽  
Devlet G. Sizgek ◽  
Erden Sizgek ◽  
Guilhem Arrachart ◽  
Cyrielle Rey ◽  
...  
Keyword(s):  
Phenolic Resin ◽  
Spent Nuclear Fuel ◽  
High Surface ◽  
Surface Adsorption ◽  
Ammonium Persulfate ◽  
Carbon Adsorbents ◽  
Minor Actinide ◽  
Neutron Absorption ◽  
Acidic Media ◽  
Neutron Absorption Cross Section

Structured carbon adsorbents were prepared by carbonizing macroporous polyacrylonitrile beads whose pores were lined with a mesoporous phenolic resin. After activation, the beads were tested for minor actinide (Np and Am), major actinide (Pu and U) and lanthanide (Gd) adsorption in varying acidic media. The activation of the carbon with ammonium persulfate increased the surface adsorption of the actinides, while decreasing lanthanide adsorption. These beads had a pH region where Pu could be selectively extracted. Pu is one of the longest lived, abundant and most radiotoxic components of spent nuclear fuel and thus, there is an urgent need to increase its security of storage. As carbon has a low neutron absorption cross-section, these beads present an affordable, efficient and safe means for Pu separation from nuclear waste.

CARPENTER STAINLESS 304+B

Alloy Digest ◽  
1961 ◽  
Vol 10 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Cross Section ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
Neutron Absorption ◽  
Absorption Cross ◽  
Type 304 ◽  
Conventional Type ◽  
Neutron Absorption Cross Section

Abstract Carpenter Stainless 304+B is similar to conventional Type 304 with the addition of boron to give it a much higher thermal neutron absorption cross-section than other austenitic stainless steels. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-121. Producer or source: Carpenter.

Propane selective carbon adsorbents from phenolic resin precursor

2021 ◽  
pp. 111071
Author(s):  
Márcia Andrade ◽  
Andrew J. Parnell ◽  
Gabriel Bernardo ◽  
Adélio Mendes
Keyword(s):  
Phenolic Resin ◽  
Carbon Adsorbents

THERMAL NEUTRON ABSORPTION CROSS SECTION OF Xe135

1959 ◽  
Vol 37 (5) ◽  
pp. 531-536 ◽  
Author(s):  
H. R. Fickel ◽  
R. H. Tomlinson
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Mass Spectrometer ◽  
Absorption Cross Section ◽  
Yield Ratio ◽  
Neutron Absorption ◽  
Absorption Cross ◽  
Fission Yield ◽  
Effective Neutron ◽  
Neutron Absorption Cross Section

The effective neutron absorption cross section of Xe135 has been measured with a mass spectrometer by observing the variation in the Cs135/Cs137 fission yield ratio obtained at various thermal neutron fluxes. Values of 3.15 ± 0.06 megabarns and 3.27 ± 0.11 megabarns have been determined for neutron temperatures of 120 °C and 137 °C respectively.

Preparation of carbon adsorbents with high surface area and a model for calculating surface area

Carbon ◽  
2002 ◽  
Vol 40 (3) ◽  
pp. 277-284 ◽  
Author(s):  
Shaobin Yang ◽  
Haoquan Hu ◽  
Guohua Chen
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Adsorbents

Measurement of the Thermal Neutron Absorption Cross Section of Rock Samples

1983 ◽  
pp. 143-151
Author(s):  
J.A. CZUBEK ◽  
K. DROZDOWICZ ◽  
E. KRYNICKA-DROZDOWICZ ◽  
A. IGIELSKI ◽  
U. WOźNICKA
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Neutron Absorption ◽  
Absorption Cross ◽  
Rock Samples ◽  
Neutron Absorption Cross Section

Gadolinium tracers for enhancement of Sigma-log contrast measurements

Geophysics ◽  
2017 ◽  
Vol 82 (1) ◽  
pp. EN13-EN24 ◽  
Author(s):  
Christopher van der Hoeven ◽  
Matthew Montgomery ◽  
Gregory Sablan ◽  
Erich Schneider ◽  
Carlos Torres-Verdín
Keyword(s):  
Computational Modeling ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Low Cost ◽  
Neutron Absorption ◽  
Absorption Cross ◽  
Porous Rocks ◽  
Doping Agent ◽  
Wide Range ◽  
Neutron Absorption Cross Section

Borehole neutron measurements are routinely used for in situ rock assessment in hydrocarbon reservoirs. We have used gadolinium oxide nanoparticles for enhancing the sensitivity of macroscopic thermal neutron absorption cross-section (Sigma) measurements of rocks. The gadolinium-based doping agent is used due to its exceptionally high neutron absorption cross section, low cost, and availability; it is also shown to preserve or enhance the differentiation between pore fluids. Injected from a pilot well, the doping agent could thus substantially improve the precision of Sigma-derived saturation measurements. Computational modeling verifies that modest gadolinium concentrations in the rock’s pore volume give rise to significant enhancement of reported Sigma: A concentration of 1750 weight ppm is shown to offer superior contrast enhancement across a wide range of rock solid and fluid compositions. Preliminary experimental work confirms the reported effects obtained with computational modeling of gadolinium doping in simulated porous rocks.

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