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Title: Ion beam analyses of radionuclide migration in heterogeneous rocks

Abstract

The migration of radionuclides (RN) in the environment is a topic of general interest, for its implications on public health, and it is an issue for the long-term safety studies of deep geological repositories (DGR) for high-level radioactive waste. The role played by colloids on RN migration is also of great concern. Diffusion and sorption are fundamental mechanisms controlling RN migration in rocks and many experimental approaches are applied to determine transport parameters for low sorbing RN in homogeneous rocks. However, it is difficult to obtain relevant data for high sorbing RN or colloids, for which diffusion lengths are extremely short, or within heterogeneous rocks, where transport might be different in different minerals. The ion beam techniques Rutherford Backscattering Spectrometry (RBS) and micro-Particle Induced X-Ray Emission ({mu}PIXE), rarely applied in the field, were selected for their micro-analytical potential to study RN diffusion and surface retention within heterogeneous rocks. Main achievements obtained during last 12 years are highlighted.

Authors:
; ;  [1];  [2]; ;  [3]
  1. CIEMAT, Avda. Complutense 40, Madrid 28040 (Spain)
  2. CIVEN, Via delle Industrie 5, Venezia-Marghera 30175 (Italy)
  3. LNL-INFN, Viale dell' Universita 2, Legnaro-Padova 35020 (Italy)
Publication Date:
OSTI Identifier:
22121675
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1530; Journal Issue: 1; Conference: ION BEAMS '12: International conference on multidisciplinary applications of nuclear physics with ion beams, Legnaro, Padova (Italy), 6-8 Jun 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 61 RADIATION PROTECTION AND DOSIMETRY; DIFFUSION LENGTH; ENVIRONMENT; HIGH-LEVEL RADIOACTIVE WASTES; ION BEAMS; ION MICROPROBE ANALYSIS; MINERALS; PIXE ANALYSIS; PUBLIC HEALTH; RADIONUCLIDE MIGRATION; ROCKS; RUTHERFORD BACKSCATTERING SPECTROSCOPY; SAFETY ANALYSIS; SORPTION; UNDERGROUND DISPOSAL

Citation Formats

Alonso, Ursula, Missana, Tiziana, Garcia-Gutierrez, Miguel, Patelli, Alessandro, Rigato, Valentino, and Ceccato, Daniele. Ion beam analyses of radionuclide migration in heterogeneous rocks. United States: N. p., 2013. Web. doi:10.1063/1.4812909.
Alonso, Ursula, Missana, Tiziana, Garcia-Gutierrez, Miguel, Patelli, Alessandro, Rigato, Valentino, & Ceccato, Daniele. Ion beam analyses of radionuclide migration in heterogeneous rocks. United States. doi:10.1063/1.4812909.
Alonso, Ursula, Missana, Tiziana, Garcia-Gutierrez, Miguel, Patelli, Alessandro, Rigato, Valentino, and Ceccato, Daniele. Thu . "Ion beam analyses of radionuclide migration in heterogeneous rocks". United States. doi:10.1063/1.4812909.
@article{osti_22121675,
title = {Ion beam analyses of radionuclide migration in heterogeneous rocks},
author = {Alonso, Ursula and Missana, Tiziana and Garcia-Gutierrez, Miguel and Patelli, Alessandro and Rigato, Valentino and Ceccato, Daniele},
abstractNote = {The migration of radionuclides (RN) in the environment is a topic of general interest, for its implications on public health, and it is an issue for the long-term safety studies of deep geological repositories (DGR) for high-level radioactive waste. The role played by colloids on RN migration is also of great concern. Diffusion and sorption are fundamental mechanisms controlling RN migration in rocks and many experimental approaches are applied to determine transport parameters for low sorbing RN in homogeneous rocks. However, it is difficult to obtain relevant data for high sorbing RN or colloids, for which diffusion lengths are extremely short, or within heterogeneous rocks, where transport might be different in different minerals. The ion beam techniques Rutherford Backscattering Spectrometry (RBS) and micro-Particle Induced X-Ray Emission ({mu}PIXE), rarely applied in the field, were selected for their micro-analytical potential to study RN diffusion and surface retention within heterogeneous rocks. Main achievements obtained during last 12 years are highlighted.},
doi = {10.1063/1.4812909},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1530,
place = {United States},
year = {Thu Jul 18 00:00:00 EDT 2013},
month = {Thu Jul 18 00:00:00 EDT 2013}
}
  • Comparison of trace element signatures of country rocks as a function of distance from the contact with two pegmatites, Tin Mountain and Etta, in the Black Hills of South Dakota, suggests that some elements such as K, Li, Rb, Cs, As, Sb, Zn and Pb, have migrated to distances of 4 to 40 meters during contact metamorphism. The relative degree of migration varies depending on the element. On the other hand, there is virtually no migration of rare earth elements (REE), Al, Sc, Cr, Hf, U, and Th. Biotite and muscovite are effective trace element traps for Li, Rb, andmore » Cs. Biotite has a greater affinity for Rb, Cs and Li than muscovite. 9 references, 5 figures, 1 table.« less
  • Burial of hazardous nuclear waste in geological repositories is considered to be in the best environmental interest. However, to minimize potential risk for future generations, an accurate knowledge is required of the time- and space-dependent concentrations of the radionuclides as they migrate from their burial site. Numerical solutions to both the conventional advection-dispersion equation and a new transport equation (containing directional dependence) are utilized to study the migration of radionuclides in heterogeneous media. In particular, layered fractured formations are examined. The new transport formulation, with its directional dependence, yields details in concentration profiles not shown by the advection-dispersion approach.
  • Purpose: Control of cancer metastasis is one of the most important issues in cancer treatment. We previously demonstrated that carbon particle irradiation suppresses the metastatic potential of cancer cells, and many studies have reported that photon irradiation promotes it. The purpose of this study was to investigate the effect of carbon beam on non-small-cell lung cancer (NSCLC) cell aggressiveness and gene expression. Methods and Materials: A549 (lung adenocarcinoma) and EBC-1 (lung squamous cell carcinoma) cells were treated with 290 MeV/nucleon carbon ion beam at the Heavy Ion Medical Accelerator in Chiba or with 4-MV X-ray at Osaka University. We testedmore » proliferative, migratory, and invasive activities by cell proliferation assay, Boyden chamber assay, and Matrigel chemoinvasion assay, respectively. cDNA microarray and reverse transcription polymerase chain reaction were also performed to assess mRNA expression alteration. Results: X-irradiation increased cell proliferation of A549 cells at 0.5 Gy, whereas high-dose X-ray reduced migration and invasion of A549 cells. By contrast, carbon beam irradiation did not enhance proliferation, and it reduced the migration and invasion capabilities of both A549 and EBC-1 cells more effectively than did X-irradiation. Carbon beam irradiation induced alteration of various gene expression profiles differently from X-ray irradiation. mRNA expression of ANLN, a homologue of anillin, was suppressed to 60% levels of basal expression in carbon beam-irradiated A549 cells after 12 h. Conclusion: Carbon beam effectively suppresses the metastatic potential of A549 and EBC-1 cells. Carbon beam also has different effects on gene expressions, and downregulation of ANLN was induced only by carbon beam irradiation.« less
  • The rates of migration of the radionuclides /sup 60/Co, /sup 90/Sr, and /sup 90/Y through a simulated ground layer were determined, and a method for predicting relative rates of migration is proposed.