title: Characterization of bauxite residue (red mud) for235U,238U,232Th and40K using neutron activation analysis and the radiation dose levels as modeled by MCNP.
abstract: This study employs thermal and epithermal neutron activation analysis (NAA) to quantitatively and specifically determine absorption dose rates to various body parts from uranium, thorium and potassium. Specifically, a case study of bauxite residue (red mud) from an industrial facility was used to demonstrate the feasibility of the NAA approach for radiological safety assessment, using small sample sizes to ascertain the activities of235U,238U,232Th and40K. This proof-of-concept was shown to produce reliable results and a similar approach could be used for quantitative assessment of other samples with possible radiological significance.238U and232Th were determined by epithermal and thermal neutron activation analysis, respectively.235U was determined based on the known isotopic ratio of238U/235U.40K was also determined using epithermal neutron activation analysis to measure total potassium content and then subtracting its isotopic contribution. Furthermore, the work demonstrates the application of Monte Carlo Neutral-Particle (MCNP) simulations to estimate the radiation dose from large quantities of red mud, to assure the safety of humans and the surrounding environment. Phantoms were employed to observe the dose distribution throughout the human body demonstrating radiation effects on each individual organ.
authors.affiliation: Nuclear and Radiation Engineering Program, University of Texas, Pickle Research Campus, R-9000, Austin, TX 78712, USA. Electronic address: s.landsberger@mail.utexas.edu.
authors.forename: S
authors.initials: S
authors.lastname: Landsberger
authors.affiliation: Nuclear and Radiation Engineering Program, University of Texas, Pickle Research Campus, R-9000, Austin, TX 78712, USA.
authors.forename: A
authors.initials: A
authors.lastname: Sharp
authors.affiliation: Nuclear and Radiation Engineering Program, University of Texas, Pickle Research Campus, R-9000, Austin, TX 78712, USA.
authors.forename: S
authors.initials: S
authors.lastname: Wang
authors.affiliation: KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, 3001 Leuven, Belgium.
authors.forename: Y
authors.initials: Y
authors.lastname: Pontikes
authors.affiliation: Institute of Physics, University of Tartu, Ostwaldi 1, 50411 Tartu, Estonia.
authors.forename: A H
authors.initials: AH
authors.lastname: Tkaczyk
mesh_terms: D000537:Aluminum Oxide; D008956:Models, Chemical; D009010:Monte Carlo Method; D009501:Neutron Activation Analysis; D019047:Phantoms, Imaging; D011197:Potassium Radioisotopes / Q000032:analysis*; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*; D013910:Thorium / Q000032:analysis*; D014501:Uranium / Q000032:analysis*
chemical_list: D011197:Potassium Radioisotopes; D014501:Uranium; D013910:Thorium; D000537:Aluminum Oxide
keywords: MCNP dosimetry modeling; Neutron activation analysis; Red mud