Publications by Year: 2015

2015
Kotopoulou I, Godelitsas A, Göttlicher J, Steininger R, Price R, Fike DA, Amend J, Gilhooly WP, Druschel GK, Mertzimekis TJ, et al. Sulfur Mineralogy and Speciation in the Shallow-Sea Hydrothermal Sediments off Milos Island (Greece). In: Goldschmidt Conference 2015, 16-21 August 2015, Prague, Czech Republic. Vol. 1670. ; 2015. Website
Zouros TJM, Kanellakopoulos A, Madesis I, Dimitriou A, Fernandez-Martin M, Martinez G, Mertzimekis TJ. The Optimization of a 4-Element Input Lens on a Hemispherical Deflector Analyzer Using SIMION. In: Ninth International Conference on Charged Particle Optics. Vol. 21(S4). ; 2015. pp. 148.
Godelitsas A, Tzamos E, Filippidis A, Sokaras D, Wenk T-C, Griego G, Papadopoulos A, Stoulos S, Gamaletsos P, Mertzimekis TJ, et al. New Insights into the Mineral Chemistry of Au-Bearing pyrite/As-Pyrite/arsenopyrite Concentrate from Olympias Deposit, Kassandra Mines (Chalkidiki, Greece). In: Goldschmidt Conference 2015, 16-21 August 2015, Prague, Czech Republic. Vol. 1062. ; 2015. Website
Papageorgiou F, Godelitsas A, Xanthos S, Voulgaris N, Nastos P, Mertzimekis TJ, Argyraki A, Katsantonis G. Characterization of phosphogypsum deposited in Schistos remediated waste site (Piraeus, Greece). In: Merkel BJ, Arab A Uranium - Past and Future Challenges. Springer International Publishing; 2015. pp. 271-280.Abstract
Abstract The operation of a phosphate fertilizer industry in Drapetsona, near Piraeus port (Greece), resulted in the deposition of 10 million tons of phosphogypsum (PG) into an old limestone quarry, in the period 1979-1989. The whole deposit has been recently remediated using geomembranes and thick soil cover with vegetation. The purpose of the present study was to characterize representative samples of that phosphogypsum, using diffraction (powder-XRD), microscopic (SEM-EDS), analytical (ICP-MS), and spectroscopic techniques (High-resolution γ-ray spectrometry and XRF). The material contains crystalline gypsum (CaSO4.2H2O) and Ca-Si-Al-S-F (chukhrovite-type/meniaylovite) phases. The natural radioactivity is mainly due to the $^{238}$U series and particularly $^{226}$Ra (average: 462 Bq/kg), which is relatively low compared to PG from the rest of the world. Furthermore, leaching experiments using local (Attica) rainwater, together with ICP-MS, were performed to assess the potential release of elements in the environment.
Mitsi E, Mertzimekis TJ. RICOCHET: A quick-and-dirty approach to analyze μ-XRF synchrotron data using open-source utilities. In: Hellenic Nuclear Physics Society; 2015. Website
Lagaki V, Kouvaris E, Mertzimekis TJ. A new γ-spectrometry station at the University of Athens. [Internet]. 2015. Website
Madesis I, Dimitriou A, Laoutaris A, Lagoyannis A, Axiotis M, Mertzimekis T, Andrianis M, Harissopulos S, Benis EP, Sulik B, et al. Atomic Physics with Accelerators: Projectile Electron Spectroscopy (APAPES). In: Journal of Physics: Conference Series. Vol. 583. ; 2015. pp. 012014.Abstract
The new research initiative APAPES (http://apapes.physics.uoc.gr/) has already established a new experimental station with a beam line dedicated for atomic collisions physics research, at the 5 MV TANDEM accelerator of the National Research Centre "Demokritos" in Athens, Greece. A complete zero-degree Auger projectile spectroscopy (ZAPS) apparatus has been put together to perform high resolution studies of electrons emitted in ion-atom collisions. A single stage hemispherical spectrometer with a 2-dimensional Position Sensitive Detector (PSD) combined with a doubly-differentially pumped gas target will be used to perform a systematic isoelectronic investigation of K-Auger spectra emitted from collisions of preexcited and ground state He-like ions with gas targets using novel techniques. Our intention is to provide a more thorough understanding of cascade feeding of the 1s2s2p 4 P metastable states produced by electron capture in collisions of He-like ions with gas targets and further elucidate their role in the non-statistical production of excited three-electron 1s2s2p states by electron capture, recently a field of conflicting interpretations awaiting further resolution. At the moment, the apparatus is being completed and the spectrometer will soon be fully operational. Here we present the project progress and the recent high resolution spectrum obtained in collisions of 12 MeV C 4+ on a Neon gas target.
Kanellakopoulos A, Angelinos N, Madesis I, Zouros TJM, Fernández-Martín M, Martínez G, Mertzimekis TJ. Hemispherical Deflector Analyzer input lens optimization using SIMION. [Internet]. 2015. Website
Karailias A, Katsiva C, Lagaki V, Kanellakopoulos A, Mertzimekis TJ, Kafantaris F-CA, Godelitsas A. The Athens Mobile γ-Spectrometry System (AMESOS). In: Hellenic Nuclear Physics Society; 2015. Website
Kotopoulou I, Mertzimekis TJ, Godelitsas A, Price R, Fike DA, Amend JP, III GWP, Druschel GK. Natural Radioactivity in Marine Sediment Cores from the Shallow-Sea Hydrothermal System off Milos Island, Greece. [Internet]. 2015. Website
Diriken J, Patronis N, Andreyev A, Antalic S, Bildstein V, Blazhev A, Darby IG, De Witte H, Eberth J, Elseviers J, et al. Experimental study of the $^{66}\mathrm{Ni}(d,p) ^{67}\mathrm{Ni}$ one-neutron transfer reaction. Phys. Rev. C. 2015;91:054321.
Batziou E, Koutsilianou V, Stavropoulos L, Psaltis A, Mertzimekis TJ. Modeling radiative proton-capture reactions in mid–heavy nuclei. In: Hellenic Nuclear Physics Society; 2015. Website
Botsou F, Godelitsas A, Kaberi H, Mertzimekis TJ, Goettlicher J, Steininger R, Scoullos M. Distribution and partitioning of major and trace elements in pyrite-bearing sediments of a Mediterranean coastal lagoon. Chemie der Erde. 2015;75:–.Abstract
Abstract The formation of iron sulphide minerals exerts significant control on the behaviour of trace elements in sediments. In this study, three short sediment cores, retrieved from the remote Antinioti lagoon (N. Kerkyra Island, \{NW\} Greece), are investigated concerning the solid phase composition, distribution, and partitioning of major (Al, Fe) and trace elements (Cd, Cu, Mn, Pb, and Zn). According to $^{210}$Pb, the sediments sampled correspond to depositions of the last 120 years. The high amounts of organic carbon (4.1–27.5%) result in the formation of Fe sulphides, predominantly pyrite, already at the surface sediment layers. Pyrite morphologies include monocrystals, polyframboids, and complex FeS–FeS$_2$ aggregates. According to synchrotron-generated micro X-ray fluorescence and X-ray absorption near-edge structure spectra, authigenically formed, Mn-containing, Fe(III) oxyhydroxides (goethite type) co-exist with pyrite in the sediments studied. Microscopic techniques evidence the formation of galena, sphalerite and CuS, whereas sequential extractions show that carbonates are important hosts for Mn, Cd, and Zn. However, significant percentages of non-lattice held elements are bound to Fe/Mn oxyhydroxides that resist reductive dissolution (on average 60% of Pb, 46% of Cd, 43% of Zn and 9% of Cu). The partitioning pattern changes drastically in the deeper part of the core that is influenced by freshwater inputs. In these sediments, the post-depositional pyritization mechanism, illustrated by overgrowths of Fe monosulphides on pre-existing pyrite grains, results in relatively high degree of pyritization that reaches 49% for Cd, 66% for Cu, 32% for Zn and 7% for Pb.
Christopoulou ME, Mertzimekis TJ, Nomikou P, Papanikolaou D, Carey S, Mandalakis M. Influence of hydrothermal venting on water column properties in the crater of the Kolumbo submarine volcano, Santorini volcanic field (Greece). Geo-Marine Letters. 2015;36:1–10.Abstract
The Kolumbo submarine volcano, located 7 km northeast of the island of Santorini, is part of Santorini’s volcanic complex in the south Aegean Sea, Greece. Kolumbo’s last eruption was in 1650 AD. However, a unique and active hydrothermal vent field has been revealed in the northern part of its crater floor during an oceanographic survey by remotely operated vehicles (ROVs) in 2006. In the present study, conductivity-temperature-depth (CTD) data collected by ROV Hercules during three oceanographic surveys onboard E/V Nautilus in 2010 and 2011 have served to investigate the distribution of physicochemical properties in the water column, as well as their behavior directly over the hydrothermal field. Additional CTD measurements were carried out in volcanic cone 3 (VC3) along the same volcanic chain but located 3 km northeast of Kolumbo where no hydrothermal activity has been detected to date. CTD profiles exhibit pronounced anomalies directly above the active vents on Kolumbo’s crater floor. In contrast, VC3 data revealed no such anomalies, essentially resembling open-sea (background) conditions. Steep increases of temperature (e.g., from 16 to 19 °C) and conductivity near the maximum depth (504 m) inside Kolumbo’s cone show marked spatiotemporal correlation. Vertical distributions of CTD signatures suggest a strong connection to Kolumbo’s morphology, with four distinct zones identified (open sea, turbid flow, invariable state, hydrothermal vent field). Additionally, overlaying the near-seafloor temperature measurements on an X–Y coordinate grid generates a detailed 2D distribution of the hydrothermal vent field and clarifies the influence of fluid discharges in its formation.