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Provenance and sedimentation of Pu and Np in the northern Taiwan Strait suffering intensive land-ocean interaction.
Environ Pollut
November 2024
The Key Laboratory of Coastal and Island Development of Ministry of Education, School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, 210023, China.
Article Synopsis
- The China Sea faces increased risk of contamination from human-made radionuclides, particularly plutonium (Pu) and neptunium (Np), making it essential to study their origins and movement for safety assessments.
- This study uses cutting-edge SF-ICP-MS technology to measure Pu and Np levels in sediment cores from the northern Taiwan Strait and East China Sea, confirming their utility as tools for dating geological events.
- Findings show global fallout and nearby nuclear tests as primary sources of these isotopes, with distinctive behaviors affecting their sediment distribution and environmental mobility, highlighting different preservation in sediments versus water.
Multi-scale characterization of lead-rich deposited particles originating from the fire of Notre-Dame de Paris.
Sci Total Environ
October 2024
Ministère de la Culture, Laboratoire de recherche des monuments historiques (LRMH), 77420 Champs-sur-Marne, France; Sorbonne Université, Muséum national d'Histoire naturelle, Ministère de la Culture, CNRS, UAR 3224, Centre de recherche sur la conservation (CRC), 75005 Paris, France.
Fire is a major hazard for built heritage. The fire at Notre-Dame on April 15, 2019 completely destroyed the woodframe and the lead roof (about 285 tons) almost entirely melted due to high temperatures. A part of the molten lead escaped into the atmosphere in the form of aerosols while the majority remains within cathedral enclosure in the form of deposits, metallic remains, spatters etc.
View Article and Find Full Text PDFReview of the sources and behaviors of plutonium isotopes in the atmosphere and ocean.
J Environ Radioact
July 2024
Laboratory for Environmental Research at Mount Fuji, Okubo Shinjyuku-ku, Tokyo, Japan. Electronic address:
Plutonium, as well as fission products such as Cs, had been released into the earth environment in 1945 after the first atmospheric nuclear explosion of plutonium bomb in the desert of New Mexico (USA, July 16) and later over Nagasaki (August 9), followed then by many other explosions. Thus, plutonium cycling in the atmosphere and ocean has become a major public concern as a result of the radiological and chemical toxicity of plutonium. However, plutonium isotopes and Cs are important transient tracers of biogeochemical and physical processes in the environment, respectively.
View Article and Find Full Text PDFLaser Ablation Plasmas and Spectroscopy for Nuclear Applications.
Appl Spectrosc
January 2024
Nuclear Engineering Program, Department of Materials Science and Engineering, University of Florida, Gainesville, Florida, USA.
The development of measurement methodologies to detect and monitor nuclear-relevant materials remains a consistent and significant interest across the nuclear energy, nonproliferation, safeguards, and forensics communities. Optical spectroscopy of laser-produced plasmas is becoming an increasingly popular diagnostic technique to measure radiological and nuclear materials in the field without sample preparation, where current capabilities encompass the standoff, isotopically resolved and phase-identifiable (e.g.
View Article and Find Full Text PDFAge-Dating of Foliage and Soil Organic Matter: Aligning Th:Ra and Be:Pb Radionuclide Chronometers over Annual to Decadal Time Scales.
Environ Sci Technol
October 2023
Department of Earth Sciences, Dartmouth College, 19 Fayerweather Hill Road, Hanover, New Hampshire 03755, United States.
The Th:Ra ratios of foliage and organic soil horizons evolve with time following a predictable radioactive decay law and thus provide a new chronometer for absolute age-dating of plant and soil organic matter. Preferential uptake of Th ( = 1.9 years) and Ra ( = 5.
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