0605320 - ÚJF 2026 RIV NL eng J - Journal Article
Strunga, Vladimír - Havránek, Vladimír - Lorinčík, J. - Sihelská, K. - Krist, Pavel - Havelcová, M. - Čejková, B. - Mizera, Jiří
Radiation-enhanced fluid diffusion and alteration around uraniferous inclusions in Cenomanian resinite from North Bohemia.
Chemical Geology. Roč. 673, February (2025), č. článku 122554. ISSN 0009-2541. E-ISSN 1872-6836
R&D Projects: GA ČR(CZ) GA19-05360S
Research Infrastructure: CICRR - 90241
Institutional support: RVO:61389005
Keywords : Radiation-induced alteration * Fluid diffusion * Fossil resin * Alpha particles * Alpha recoils * Fission fragments * mu-PIXE/RBS * SEM/EDX
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 3.6, year: 2023 ; AIS: 1.314, rok: 2023
Method of publishing: Limited access
Result website:
https://www.sciencedirect.com/science/article/pii/S000925412400634XDOI: https://doi.org/10.1016/j.chemgeo.2024.122554

Advanced analytical methods including SEM/EDX and mu -PIXE/RBS microanalyses were used to investigate chemical alterations around uraniferous inclusions in a Cenomanian fossil resin (resinite). Studied alterations related to several types of discontinuities in resinite matrix are a model example of the phase interface between solid polymeric hydrocarbon and aqueous fluids exposed to long-term irradiation by heavy energetic ions resulting mostly from the natural decay of uranium. Computational models of ion ranges correspond well with the observed range of alterations about 35 mu m from uraniferous inclusions. The major alteration is found within a 20 mu m inner zone. It is characterized by distinct sulfur enrichment and an increase in the O/C ratio. No sulfur enrichment in the resinite matrix occurs apart from the uraniferous phases. Proton beam-induced alterations of the resinite were investigated and compared with the natural ones. The differences indicate the importance of aqueous fluids in the natural radiation-induced alteration process. It is concluded that radiation-enhanced mass transfer and reactions occur at solid-fluid interfaces during the long-term energy deposition by alphas, alpha recoils, and fission fragments combined. The role of thermal effects and and formation of radical species by radiolysis of aqueous fluids on a microscale is discussed.
Permanent Link: https://hdl.handle.net/11104/0362971