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Department of Nuclear Research

Head of department prof., habil. dr. Vidmantas Remeikis habil.dr. V.Remeikis 
phone +370 5 266 1640

Department of Nuclear Research implements the technological possibilities important for public and business needs, performs training and expertise in the fields of nuclear physics, nuclear and mass spectroscopy. The aim of the department covers development of smart-environmental and environment-safe nuclear fuel cycle technologies, implementation of new material modification and analysis methods.
 
Activities
  • Development of theoretical and experimental methods devoted for safe operation of nuclear facilities, radiation safety and optimization of radioactive waste management. Theoretical and experimental research on interaction of radioactive waste with different barriers and shielding materials, degradation of engineering barriers in waste repositories, assessment of radionuclide accumulation and migration in the environment.
  • Development of mass spectrometry and chromatography methods in material sciences, biology, environmental physics. Application of chemical and isotopic composition evaluation of micro impurities of the atmosphere for development of new methods for physical and chemical processes studies in the atmosphere.
  • Research of the processes of interaction of high intensity light pulses with material, search of new materials sensitive to ionizing radiation for radiation detection purposes.
  • Modernization of ion beam analysis techniques, analysis (PIXE, RBS) and modification of properties of semiconductor materials by high-energy heavy ion beams and its application for thin layer technology.
  • Application of carbon isotopic ratio measurements by accelerator mass spectrometry in archaeological dating, environment and biology research, and technology development.

 Laboratories:



Equipment
Two identical High resolution gamma ray spectrometers







Ion accelerator "Tandetron 4110A“ (General Ionex Corp.)
Intended for heavy ion implantation, helium or proton Rutherford backscattering spectrometry (RBS), particle-induced X-ray (PIXE), other analytical techniques (luminescence and microwave probed photoconductivity transients methods). Any ions from H to Au might be accelerated to 4.8 MeV. Ion injection at such energies imply formation of new material not in thermodynamic equilibrium bypassing normal chemical solubility rules or material modification at desired depth.

 



Alpha particle spectrometer "Octete Plus"

 

X-ray spectrometer (Canberra BNLS)
https://www.mirion.com/products/
Two X-ray spectrometers and 7905-BWR bellows-sealed windowless retractable cryostat. It has lithium-drifted silicon 30 mm2 active area, sensitive to ionizing radiation, particularly to X-rays and gamma rays. Detector resolution (FWHM) is 165 eV at 5.894 keV for 55Fe X-ray peak; and  X-rays Amptek X-123 spectrometer which uses a thermoelectrically cooled Si-PIN junction detector (area – 25 mm2, thickness – 0.5 mm), that transmits signals via pre-amplifier to digital pulse processor DP5, consisting of shaping – amplifier and a multichannel analyzer. Before entering detector, the incident photons pass a protective 25 μm Be foil and a collimator.

 

FHT 770 T6 low level α, β counter (Thermo Scientific)
https://www.htds.fr/en/optoelectronics-measurements/nuclear-and-radiation-safety/nuclear-instrumentation/alpha-beta-counters/multi-low-level-counter-fht770/
To measure contamination down to mBq range with relatively short measurement time with typical detector efficiency of 30%. It is sensitive to all beta emitters and for beta nuclide activity detection sample preparation procedure is needed.





 
Four 239PuBe neutron sources with a total activity of 5.7·107 n.s-1 and storage device of the neutron sources
The neutrons are used for irradiation and  for educational  (material composition determination via activation, life time experiments, coincidence experiments and other) purposes. The neutron source storage device is the cylindrical well 0.6 m of diameter, 1.8 m of depth under the ground, which is filled by polyethylene matrix as moderator. The neutron sources are placed in central channel of the well and two vertical experimental channels are situated 15 cm and 20 cm from the source to obtain different neutron flux characteristics during irradiation experiments. 



 
Two identical GC2520 series HPGe coaxial detectors (Canberra)
https://www.mirion.com/products/germanium-detectors
With a relative efficiency of 25%, and with an energy resolution of 2.0 keV at the energy of 1.33 MeV are used for identification and/or quantification of radionuclides by analysis of the gamma-ray energy spectrum. This method is widely used in the environmental radioactivity monitoring, worker health monitoring, reactor corrosion monitoring, forensic examination, nuclear medicine, material testing, monitoring of industrial processes. An electronic setup includes a high-voltage power supply, a preamplifier, a spectroscopy amplifier, and a analog-to-digital converter (Canberra), driven by a PC with the software GENNIE2K for the analysis. 
 
 
Single stage accelerator mass spectrometer (SSAMS, NEC, USA)
 
Elemental analyzer (EA, Vario Isotope Select, Elementar, GmbH)

 
Automated Graphitization Equipment AGE 3 (IonPlus AG)

 
High resolution inductively coupled plasma mass spectrometer with the laser ablation system (ELEMENT-2 (ThermoFinnigan AB) with imput system:
  • Solid sample introduction system UP213 (New Wave).
  • Microwave high-pressure sample digestion furnace Multiwave 3000 (Anton Paar).

 
Isotope ratio mass spectrometers (Thermo Finnigan Delta plus Advantage, Thermo Scientific Delta V Advantage) connected with input devices
 
Gas chromatograph (Trace GC ultra) for δ13C, δ15ratio analysis of liquid and gaseous samples, sample preparation and measurements of amino and fatty acids

 
 
Elemental analyzer (Thermo Flash EA 1112) for δ13C, δ15N, δ34ratio analysis of the solid samples

 
GasBench II (Thermo Scientific) for δ13C and δ18O ratio in carbonates, water, CO2, DIC (dissolved inorganic carbon)
 
TC/EA high temperature conversion elemental analyzer (Thermo Scientific) for δ18O and D/H ratio determination of all organic compounds and water

 

Mössbauer spectrometer (Wissenschaftliche elektronik GMBH)
http://www.wissel-instruments.de/

  • Including electron conversion detector equipped with closed cycle helium cryostat (6 – 300 K).   Vacuum furnace (300 – 1000 K) and ball-milling equipment are used for sample preparation.
  • Mössbauer spectroscopy provides deep insight into properties of the nanomaterials; investigation of some physical properties of complex semiconductors, ferroelectrics, multiferroic and ionic composites in the vicinity of phase transition; it is irreplaceable tool for corrosion analysis as well as for the characterization of magnetic nanowires.

 



Closed cycle helium cryostat (6 – 300 K)

 
Vacuum furnace (300 – 1000 K)

 

Ball-milling equipment

 

 
Software and Methods
Software  

In the Experimental Nuclear Physics Laboratory of CPST the MCNP6, MCNPX, SCALE 6.2, GEANT4 program packages are used for different applications solving tasks of particle interaction with material.

  • The deterministic methods (SCALE 6.2) are used for numerical modelling of criticality, radiation shielding safety, nuclide composition analysis in the licensed critical reactors (RBMK, PWR, VVER) and spent nuclear fuel casks.  Monte Carlo (MCNP6, MCNPX, GEANT4) are used for modelling of both critical and sub-critical systems (IV generation reactors (GT-MHR) (Fig. a), hybrid systems (fusion-fission hybrid system), accelerator driven systems (EURISOL) or conventional power rectors (VVER, RBMK).  The accuracy of Monte Carlo codes is limited by ÖN (number of traced particles), so despite wide application possibilities, sometimes advantage is on deterministic codes. The latest version of SCALE 6.2 can use MCNP neutron fluxes for material activation tasks in cases of distant neutron sources or shielded materials.  In practice, experiments are needed to validate the models in each analysed case. MCNP6 and GEANT4 codes are used modelling response of various types of detectors on radiation.

 

 

Fig. a



Codes of calculation of few body systems: parallel code for calculation of 3-5 particle harmonic oscillator brackets, which is used for description of few fermion systems; and code for parameter calculation of 3-6 nucleon systems. Intended for calculation of binding energies and other parameters of the lightest atomic nuclei.
Computer codes for the evaluation of the contamination levels of various radionuclides in the nuclear power plant equipment, buildings, waste and enironment:

  • Assessment of radioactive contamination of reactor primary circuit by the computer code OSCAR (CEA, France), taking into account the radiological characterisation important for the decommissioning of NPPs.
  • LIETDOS computer code package aimed to simulate radionuclides migration in the environment and to assess exposure doses to the humans and non-human biota.
  • THYROID computer code for the assessment of the inhabitants’ thyroid exposure doses after the accidents in the nuclear power plants. 

 

 

Methods

  • Determination of nuclide content in radioactive waste by scaling factor (nuclide vector) method. For radioactive waste characterization, techniques based on theoretical modelling have to be used. To this end, our laboratory is developing a semi-empirical nuclide vector, otherwise called scaling factors, method, which enables a reliable assessment of all radioactive waste by cheap measurement of easily measurable high-energy gamma emitters such as 60Co and / or 137Cs and use of the theoretical model of generation of radionuclides in a nuclear reactor and migration of radionuclides in NPP, i. e. to calculate specific activity of the difficult-to-measure radionuclides using ratios of their specific activity to specific activity of the easy-to-measure radionuclides, which (ratios) are determined from the theoretical modelling and measurements of specific activity of radionuclides in a small amount of specially selected samples (Fig. b).

Fig. b

 

  • The available laboratory equipment and methods for plutonium (238Pu, 239,240Pu), cesium (134Cs, 137Cs), americium (241Am, 243Am), strontium (89Sr, 90Sr), technetium (99Tc), iron (55Fe), nickel (63Ni) and lead (210Pb) isotope identification in different media.
  • Analytical model of air transport of pollutants, for the case of point source and decay of primary pollutant into the secondary one during the air transport (due to e.g. photo, chemical, radioactive decay and other reactions) and taking into account atmospheric stability classes and wind conditions with the use of widely acknowledged Gaussian dispersion parameters σx  and σy for disperssion specification. Dry deposition factor used for the settlement of the pollutants. Innovativity:  the model is unique and provides analytically precise solution of pollutant chain (primary and secondary pollutant) problem. It can be used as a callibration and validation tool of sophisticated numerical models or the modelling algorithm for the modeling of pollutants transport.
  • The model of radionuclide transport in the technological circuits of a nuclear reactor for the assessment of the activity of difficult to measure radionuclides (I-129, Cs-135) in the circuit or the generated radioactive waste.
  • The available laboratory equipment and methods for plutonium (238Pu, 239,240Pu), cesium (134Cs, 137Cs), americium (241Am, 243Am), strontium (89Sr, 90Sr), technetium (99Tc), iron (55Fe), nickel (63Ni) and lead (210Pb) isotope identification in different media.

Based on laboratory experiments, the fix-bed column of biosorbent was applied to pre-concentrate plutonium from fresh water basins. This approaching equipment allowed to determine plutonium with lower input of chemical reagents and was labour as well as time consuming.

Projects

Projects 2017-2021

Project:

 

Main project features:

The pre-disposal management of radioactive waste – (PREDIS)

Year: 2020 09 – 2024 08

(ongoing)

Client: EU

 

The project targets the development and implementation of activities for pre-disposal treatment of radioactive waste streams other than nuclear fuel and high-level radioactive waste. FTMC participates in:

WP 2 Strategic Implementation

WP4 Innovations in metallic material treatment and conditioning

 

European Joint Resaarch Programme in the managemet and disposal of radiactive waste (EURAD)

Year: 2019 06 – 2024 05

(ongoing)

Client: EU

 

European collaboration towards safe RWM, including disposal, through the development of a robust and sustained science, technology and knowledge management programme that supports timely implementation of RWM activities and serves to foster mutual understanding and trust between Joint Programme participants. FTMC participates in:

WP 3 Cement-Organic-Radionuclide-Interactions (CORI)

WP 8 Spent Fuel Characterization and Evolution Until Disposal (SFC

WP 9 Waste management routes in Europe from cradle to grave (ROUTES)

WP 10 Uncertainty Management multi-Actor Network (UMAN)

Coordination and Support Action “Towards a Joint Programming on Radioactive Waste Disposal” (JOPRAD)

Year: 2015 11  – 2017 11

Client: EU

 

The overall aims of the JOPRAD are to assess the feasibility and, if appropriate, to generate a proposal for Joint Programming in the field of Radioactive Waste Management and Disposal in Europe.  It also includes Research Development & Demonstration (RD&D) activities, with the accompanying Knowledge Management Programme and its “horizontal activities”, namely establishing a state-of-the-knowledge handbook coupled with education, training, strategic studies, guidance, transfer of knowledge to less advanced programmes, as well as dissemination.

International Project on Irradiated Graphite Processing Approaches (GRAPA)

Year: 2016 11 – 2022 11

(ongoing)

Client: IAEA

 

 

The objective of the project is to support Member States in resolving irradiated graphite management up to industrial implementation of processing technologies.

 

Assistance to INPP by Technical Support Organisations in the Field of Radiological Characterisation for Block A1 (Reactor and auxiliary systems)

Year: 2016 03 – 2018 06

Client: EC, Ignalina NPP

 

The objective of the project is to advance preparations for the dismantling of Block A1 (Unit 1 reactor and related systems) by targeted technical assistance to INPP’s staff.

 

Joint Programming on Radioactive Waste Disposal (JOPRAD).

Year: 2016 – 2018

Client: Europian Commission

 

The objective of the project is to repare a proposal for the setting up of a “Joint Programming on Radioactive Waste Disposal”,  to bring together at the European level, those aspects of R&D activities implemented within national research programmes where synergy from Joint Programming is identified.

Baltic Region Initiative for Long Lasting InnovAtive Nuclear Technologies (BRILLIANT).

Year: 2015 07 – 2018 07

Client: Europian Commission

 

The project aims to provide coordination and support activities in the frame of the nuclear technologies in Baltic region.

 

Implantation and analysis of semiconductors structures by high energy ions

Year: 2017.07.20-2017.08.21

Client: UAB "Teravil"

 

The aim of the work was to tune some particular parameters (carrier life time etc.) of manufactured complex GaAs structure to desired values , i.e. to perform device parameters tuning after the last stage of its production using specific high energy ions implantation to the exact place inside the GaAs structure.

Support to State Nuclear Safety Inspectorate (VATESI) in Review of Documents Related to Licensing of Ignalina NPP Decommissioning Activities. Support to the Assessment of Decommissioning of the Ignalina NPP

Year: 2009 - 2017

Client: VATESI, Lithuania

 

Support to VATESI in review of documents related to licensing of Ignalina NPP decommissioning activities (Decommissioning Project for INPP Unit 2 Final Shutdown and Defuelling Phase; Ignalina NPP Unit 1 Turbine Hall Equipment Decontamination and Dismantling Basic Design; INPP Boiler House Equipment Dismantling and Decontamination Design Development, Safety Justification Report; New Solid Waste Retrieval Facility (B2) аt Ignalina NPP, Preliminary Safety Assessment Report; Disposal Units for Short-lived Very Low Level Waste, Preliminary Safety Assessment Report; Storage of solid radioactive waste at INPP Buildings 155, 155/1, 157 and 157/1, Safety analysis Report; Interim storage of bituminized radioactive waste at INPP Building 158, Safety analysis Report; Interim Storage Facility for RBMK Spent Nuclear Fuel Assemblies from Ignalina NPP Units 1 and 2 (B1), Preliminary Safety Assessment Report; Buffer storage facility for very low level (VLL) radioactive waste, Safety Analysis Report). 

Past Projects

Project:

 

Main project features:

Joint Programming on Radioactive Waste Disposal (JOPRAD)

Year: 2016 – 2018

Client: Europian Commission

 

The objective of the project is to repare a proposal for the setting up of a “Joint Programming on Radioactive Waste Disposal”,  to bring together at the European level, those aspects of R&D activities implemented within national research programmes where synergy from Joint Programming is identified.

Baltic Region Initiative for Long Lasting InnovAtive Nuclear Technologies (BRILLIANT)

Year: 2015 07 – 2018 07

Client: Europian Commission

 

The project aims to provide coordination and support activities in the frame of the nuclear technologies in Baltic region.

 

Preparation ofthe report of periodic safety assessment of  Maišiagala radioactive waste storage

Year: 2015 04 – 2016 10

Client: RATA (radioactive waste management agency), Lithuania

 

Preparation of periodic safety assessment report of Maišiagala RADON type near surface radioative waste storage facility. 

 

Nuclear Safety Cooperation with the Regulatory Authorities of Brazil (CNEN)

Year: 2015

Client: CNEN, Brazil

 

Provision of technical support for the Regulatory Authorities of Brazil (CNEN) in evaluation of radiological inventory for Angra 2 PWR type reactor to obtain source term for accidental releases from Angra 2.

Support to State Nuclear Safety Inspectorate (VATESI) in Review of Documents Related to Licensing of Ignalina NPP Decommissioning Activities. Support to the Assessment of Decommissioning of the Ignalina NPP

Year: 2009 - 2017

Client: VATESI, Lithuania

 

Support to VATESI in review of documents related to licensing of Ignalina NPP decommissioning activities (Decommissioning Project for INPP Unit 2 Final Shutdown and Defuelling Phase; Ignalina NPP Unit 1 Turbine Hall Equipment Decontamination and Dismantling Basic Design; INPP Boiler House Equipment Dismantling and Decontamination Design Development, Safety Justification Report; New Solid Waste Retrieval Facility (B2) аt Ignalina NPP, Preliminary Safety Assessment Report; Disposal Units for Short-lived Very Low Level Waste, Preliminary Safety Assessment Report; Storage of solid radioactive waste at INPP Buildings 155, 155/1, 157 and 157/1, Safety analysis Report; Interim storage of bituminized radioactive waste at INPP Building 158, Safety analysis Report; Interim Storage Facility for RBMK Spent Nuclear Fuel Assemblies from Ignalina NPP Units 1 and 2 (B1), Preliminary Safety Assessment Report; Buffer storage facility for very low level (VLL) radioactive waste, Safety Analysis Report).

 

Scientific technical assistance with "Numerical evaluation of response of the neutron probe in geological structure”

Year: 2014

Client: UAB „Minijos Nafta”

 

Development of numerical evaluation of neutron sounding response in the geological structures.

11c. Evaluation of the material backlog and radiological inventory of KNPP Units 1-4

Year: 2012 01 – 2016 09

Client: DP RAO, Bulgaria

 

Provision of technical support for Kozloduy NPP and DP RAO in evaluation of radiological inventory of the Kozloduy Nuclear Power Plant Units 1 to 4 for the decommissioning purposes.

 

TACIS, G3.01/06 (GE/RA/02), Transfer of European Regulatory Methodology and Practices to the Nuclear Safety Authority of Georgia. Contract N° 132-897 (Contract between the EC and Riskaudit)

Year: 2008 12 – 2009 06

Client: Nuclear Safety Authority of Georgia

 

The aim was to assist for the Nuclear Safety Authority of Georgia in order to improve Georgian Radiation safety laws to correspond the best practice of the European Countries Nuclear Regulatory.

 

7th Euroatom Framework Programme, Treatment and Disposal of Irradiated Graphite and Other Carbonaceous Waste (CARBOWASTE)

Year: 2008 04 – 2013 03

Client: European Commission

 

CARBOWASTE focuses on treatment and disposal of irradiated graphite and other carbonaceous waste. The further goal of experiments on irradiated nuclear graphite is developing a prototype installation for the decontamination of graphite so the radioactive waste has a lower volume and eventually the graphite can be reused.

7th Euroatom Framework Programme, Redox Phenomena Controlling Systems (ReCosy)

Year: 2008  – 2012

Client: European Commission

 

The aim was the sound understanding of redox phenomena controlling the long-term release/retention of radionuclides in nuclear waste disposal and providing tools to apply the result to Performance Assessment/Safety Case.

Ion implantation technologies for the optimization of the relaxation time of the charge carries of InGaAs quantum wells

Year: 2015.06.23-2015.09.30

Client: UAB „ Ekspla”

 

The passive mode-locking with the nonlinear Kerr effect in an optical fiber when the intensity-dependent change of the polarization state combined with the intra-cavity polarizer acts as an artificial saturable absorber usually is used to achieve generation of ultrashort laser pulses. The reliable self-starting mode-locking can be achieved by introducing a Semiconductor Saturable Absorber Mirrors (SESAM). For operational wavelength of the Yb-doped fiber lasers, a SESAM based on the InxGa1-xAs/GaAs super-lattice saturable absorber and AlAs/GaAs Bragg mirror is a common choice, but its long term reliability is still an unsolved problem. It is possible to control operational parameters (recovery time, saturation fluence, modulation depth, absorption wavelength) of a SESAM by controlling the growth parameters of the semiconductor material and properly choosing the cavity design. Typical carrier recombination time for a bulk semiconductor material is usually up to ns, but for a stable modelocking of a fiber laser it should be reduced down to a few ps. It this work it was done by the H, O, As ions implantation at various energy into InxGa1-xAs quantum well region after the growing process of the complete structure. The influence of the type and energy of the ions on the main parameters dynamics of SESAM structures were revealed and advices for more stable and more effective energy-saving structures production were proposed.

Implantation and analysis of semiconductors structures by high energy ions

Year: 2012.12.17-2013.01.17

Client: UAB "Teravil"

 

Local injection of high energy ions to semiconductors structures at various flows leads to introduction of considerable amount of impurities at high velocity that could imply formation of new material not in thermodynamic equilibrium bypassing normal chemical solubility rules. That provides a possibility to achieve defects just in desired place of the sample and at levels, which are inaccessible by conventional treatment. Therefore, implantation process might be performed to tune properties (e.g., carrier lifetime, breakdown voltages, etc.) of complex semiconductor structures or devices locally and at desired depth after their synthesis is finished.

The aim of the work was to tune some particular parameters (carrier life time etc.) of manufactured complex GaAs structure to desired values , i.e. to perform device parameters tuning after the last stage of its production using specific high energy ions implantation to the exact place inside the GaAs structure. To reach this goal, computer simulation of this GaAs structure were implemented to obtain preliminary parameters for ion implantation. Subsequently, ion implantation was performed and GaAs structures properties were modified. After high energy ions implantation wanted parameters of the complete GaAs device were reached and its proper functionality was demonstrated during final test.

Implantation and analysis of semiconductors structures by high energy ions

Year: 2017.07.20-2017.08.21

Client: UAB "Teravil"

 

The aim of the work was to tune some particular parameters (carrier life time etc.) of manufactured complex GaAs structure to desired values , i.e. to perform device parameters tuning after the last stage of its production using specific high energy ions implantation to the exact place inside the GaAs structure.

Most important publications
  1. Garbarienė, Inga; Dudoitis, Vadimas; Ulevičius, Vidmantas; Plauškaitė-Šukienė, Kristina; Kilikevičius, Artūras; Matijošius, Jonas; Rimkus, Alfredas; Kilikevičienė, Kristina; Vainorius, Darius; Maknickas, Algirdas; Borodinas, Sergejus; Byčenkienė, Steigvilė. Application of acoustic agglomeration technology to improve the removal of submicron particles from vehicle exhaust. Symmetry. ISSN 2073-8994. 2021, vol. 13, iss. 7, art. no. 1200, p. 1-15.

  2. Barisevičiūtė, Rūta; Maceika, Evaldas; Juodis, Laurynas; Pabedinskas, Algirdas; Šapolaitė, Justina; Ežerinskis, Žilvinas; Butkus, Laurynas; Remeikis, Vidmantas. Modeling of 14C vertical distribution in bottom sediments of the Ignalina nuclear power plant cooling reservoir. Water. eISSN 2073-4441. 2021, vol. 13, iss. 10, art. no. 1397, p. 1-15.
  3. Balčiauskas, Linas; Skipitytė, Raminta; Garbaras, Andrius; Stirkė, Vitalijus; Balčiauskienė, Laima; Remeikis, Vidmantas. Stable isotopes reveal the dominant species to have thewidest trophic niche of three syntopic Microtus voles. Animals. ISSN 2076-2615. 2021, vol. 11, iss. 6, art. no. 1814, p. 1-14.
  4. Balčiauskas, Linas; Balčiauskienė, Laima; Garbaras, Andrius; Stirkė, Vitalijus. Diversity and diet differences of small mammals in commensal habitats. Diversity.  ISSN 1424-2818. 2021, vol. 13, iss. 8, art. no. 346, p. 1-13.
  5. Griesiūtė, Diana; Sinušaitė, Lauryna; Kizalaitė, Agnė; Antuzevics, Andris; Mažeika, Kęstutis; Baltrūnas, Dalis Antanas; Tomoyo, Goto; Sekino, Tohru; Kareiva, Aivaras; Žarkov, Aleksej. The influence of Fe3+ doping on thermally induced crystallization and phase evolution of amorphous calcium phosphate. CrystEngComm. eISSN 1466-8033. 2021, vol. 23, iss. 26, p. 4627-4637.
  6. Karpinsky, D.V.; Silibin, M.V.; Zhaludkevich, D.V.; Latushka, S.I.; Sysa, A.V.; Sikolenko, V.V.; Zhaludkevich, A.L.; Khomchenko, V.A.; Franz, A.; Mažeika, Kęstutis; Baltrūnas, Dalis Antanas; Kareiva, Aivaras. Magnetic properties of BiFeO3 – BaTiO3 ceramics in the morphotropic phase boundary: A role of crystal structure and structural parameters. Journal of magnetism and magnetic materials. ISSN 0304-8853. 2021, vol. 539, art. no. 168409, p. 1-7.
  7. Karoblis, Dovydas; Diliautas, Ramūnas; Mažeika, Kęstutis; Baltrūnas, Dalis Antanas; Niaura, Gediminas; Talaikis, Martynas; Beganskienė, Aldona; Žarkov, Aleksej; Kareiva, Aivaras. Lanthanum and manganese Co-doping effects on structural, morphological, and magnetic properties of sol-gel derived BiFeO3. Materials. ISSN 1996-1944. 2021, vol. 14, iss. 17, art. no. 4844, p. 1-12.
  8. Balčiauskas, Linas; Skipitytė, Raminta; Garbaras, Andrius; Stirkė, Vitalijus; Balciauskiene, Laima; Remeikis, Vidmantas. Isotopic niche of syntopic granivores in commercial orchards and meadows. Animals. ISSN 2076-2615. 2021, vol. 11, iss. 8, art. no. 2375, p. 1-13.
  9. Stepšys, Augustinas; Mickevičius, Saulius; Germanas, Darius; Kalinauskas, Ramutis Kazys. Calculation of five-particle harmonic-oscillator transformation brackets. Computer physics communications. ISSN 0010-4655. 2021, vol. 265, art. no. 108023, p. 1-6.
  10. Karoblis, Dovydas; Žarkov, Aleksej; Mažeika, Kęstutis; Baltrūnas, Dalis Antanas; Niaura, Gediminas; Beganskienė, Aldona; Kareiva, Aivaras. YFeO3-GdFeO3 solid solutions: Sol-gel synthesis, structural and magnetic properties. Solid state sciences. ISSN 1293-2558.2021, vol. 118, art. no. 106632, p. 1-8.
  11. Mažeika, Kęstutis; Šiliauskas, Laurynas; Skridlaitė, Gražina; Matelis, Antanas; Garjonytė, Rasa; Paškevičius, Algimantas; Melvydas, Vytautas Boleslovas. Features of iron accumulation at high concentration in pulcherrimin-producing Metschnikowia yeast biomass. Journal of biological inorganic chemistry. ISSN 0949-8257. 2021, vol. 26, iss. 2-3, p. 299-311.
  12. Politi, Tobia; Barisevičiūte, Rūta; Bartoli, Marco; Bonaglia, Stefano; Cardini, Ulisse; Castaldelli, Giuseppe; Kančauskaitė, Akvilė; Marzocchi, Ugo; Petkuviene, Jolita; Samuiloviene, Aurelija; Vybernaite-Lubiene, Irma; Zaiko, Anastasija; Zilius, Mindaugas. A bioturbator, a holobiont, and a vector: the multifaceted role of Chironomus plumosus in shaping N‐cycling. Freshwater biology. ISSN 0046-5070. 2021, vol. 66, no. 6, p. 1036-1048.
  13. Diliautas, Ramūnas; Beganskienė, Aldona; Karoblis, Dovydas; Mažeika, Kęstutis; Baltrūnas, Dalis Antanas; Žarkov, Aleksej; Raudonis, Rimantas; Kareiva, Aivaras. Reinspection of formation of BiFe1-xMnxO3 solid solutions via low temperature sol-gel synthesis route. Solid state sciences. ISSN 1293-2558. 2021, vol. 111, art. n. 106458, p. 1-6.
  14. Gorokhova, Elena; El-Shehawy, Rehab; Lehtiniemi, Maiju; Garbaras, Andrius. How copepods can eat toxins without getting sick: gut bacteria help zooplankton to feed in cyanobacteria blooms. Frontiers in microbiology. eISSN 1664-302X. 2021, vol. 11, art. no. 589816, p. 1-11.
  15. Novickij, Vitalij; Stanevičienė, Ramunė; Gruškienė, Rūta; Badokas, Kazimieras; Lukša, Juliana; Sereikaitė, Jolanta; Mažeika, Kęstutis; Višniakov, Nikolaj; Novickij, Jurij; Servienė, Elena. Inactivation of bacteria using bioactive nanoparticles and alternating magnetic fields. Nanomaterials. ISSN 2079-4991. 2021, vol. 11, iss. 2, art. no. 342, p. 1-16.
  16. Karoblis, Dovydas; Žarkov, Aleksej; Garškaitė, Edita; Mažeika, Kęstutis; Baltrūnas, Dalis Antanas; Niaura, Gediminas; Beganskienė, Aldona; Kareiva, Aivaras. Study of gadolinium substitution effects in hexagonal yttrium manganite YMnO3. Scientific reports. eISSN 2045-2322. 2021, vol. 11, art. no. 2875, p. 1-14.
  17. Montvydienė, Danguolė; Jagminas, Arūnas; Jurgelėnė, Živilė; Kazlauskas, Mindaugas; Butrimienė, Renata; Žukauskaitė, Zita; Kazlauskienė, Nijolė. Toxicological effects of different-sized Co–Fe (CoFe2O4) nanoparticles on Lepidium sativum L.: towards better understanding of nanophytotoxicity. Ecotoxicology. ISSN 0963-9292. 2021, vol. 30, iss. 2, p. 277-291.
  18. Januškevičius, Justinas; Stankevičiūtė, Živilė; Baltrūnas, Dalis Antanas; Mažeika, Kęstutis; Beganskienė, Aldona; Kareiva, Aivaras. Aqueous sol-gel synthesis of different iron ferrites: from 3D to 2D. Materials. eISSN 1996-1944. 2021, vol. 14, art. no. 1554, p. 1-12.
  19. Linauskienė, Kotryna; Dahlin, Jacob; Ežerinskis, Žilvinas; Isaksson, Marlene; Šapolaitė, Justina; Malinauskienė, Laura. Occupational exposure to nickel, cobalt, and chromium in the Lithuanian hard metal industry. Contact dermatitis. ISSN 0105-1873. 2021, vol. 84, no. 4, p. 247-253.
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