International Journal of Physics: Study and Research

ISSN: 2639-0426

European Physics Conference 2018

December 6-7, 2018, Valencia, Spain
Poster Session Abstracts
DOI: 10.18689/2639-0426.a1.003

Quantitative Interpretation of Air Radioactivity Fluctuation in the Area around Ifin-Hh

Ana Stochioiu1*, Dorina Aranghel1,2, Chivuta-Ramona Badita1,3 and Andrei Stochioiu4

1National Institute for Nuclear Physics and Engineering, Romania
2Extreme Light Infrastructure Nuclear Physics (ELI-NP), Romania
3University of Bucharest, Romania
4University Polytechnic of Bucharest, Romania

The paper presents the fluctuation of the atmospheric radioactivity level due to the nuclear activities of the HoriaHulubei National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Bucharest, Romania. The Institute has departments that carry out research and application activities in the nuclear field. During this period, the new Extreme Light Infrastructure-Nuclear Physics project is being developed. The studies refer to radioactivity measurements in aerosols samples taken from two strategic and representative. The duration of each sampling was 5 hours using the special pump. A volume of about 20 m3 was aspirated on to a special filter. Each filter was measured gross alpha / beta / gamma in several stages for the determination of radon concentration and descendants but also artificial radionuclides. The data presented in the paper are for the period 2017. The values of the radioactivity concentration in the measured samples were: i) 3 minutes after suction in the range 0.5 – 5.90 Bq / m3; ii) 24 hours after aspiration, within 0.15 – 0.22 Bq / m3; iii) 5 days after aspiration, within 0.003 – 0.014 Bq/m3 for artificial beta-emitting radionuclides; iv) 5 days after aspiration, in the range 0.040 – 0.053 Bq / m3 for artificial gamma emitting radionuclides. From the researches carried out it was found that the level of radioactivity in the studied area is under maxim admissible value. All the values were comparable to the previous years and the national one. Thus, the impact on the environment, the professionally exposed person and the population was negligible.

Keywords: Aerosols, Measurements, Radioactivity Level, Air Quality.

Biography:
Ana Stochioiu head of the Laboratory for Dosimetry of Personnel and the Environment of IFIN-HH. She deal with dosimetry of personnel and environment with passive dosimeters. She coordinate the activity of monitoring the radioactivity of the environment in the area of influence of IFIN-HH, ELI-NP and institutes on the Magurele platform. The data obtained within these activities and research activities in the projects in which they are involved are presented in scientific papers at workshops, conferences and congresses internally and internationally.

Deep UV Reversible Optical Data Storage Properties of Alkaline Earth Matlockites Doped with Samarium Ions in the Trivalent Oxidation State

Lubina Thattamveedu Kasim1*, Nicolas Riesen2,3, Kate Badek1 and Hans Riesen1

1The University of New South Wales, Australia
2The University of South Australia, Australia
3The University of Adelaide, Australia

In the past decades, the unique properties of rare earth elements have played an important role in a wide range of technologies based on luminescence. Inorganic nanocrystalline alkaline earth fluoro halides (MeFX: Sm3+; Me = Ba, Sr; X = Cl, Br, I) crystallize in P4/nmm‐D4h space group and upon exposure to UV‐C light exhibit an extraordinary photoreduction mechanism. We believe that the presence of oxide impurities such as (O22−, O2) facilitates the valence state switching from Sm3+ to Sm2+ with remarkably high efficiency upon excitation into absorption bands in the deep ultra‐violet region centred around 200 nm. The generated Sm2+ increases in a linear fashion with increasing UV‐C exposure. To investigate the reversibility of the valence state switching, the photoionization mechanism of Sm2+ was studied via photoluminescence. The bleaching kinetics indicate that the average separation between the samarium ions and the oxide impurities is on the order of a few interionic spacing. The photoionization process was modelled by employing dispersive first order kinetics. The samples of samarium doped MeFX were prepared by ball milling and characterized by different spectroscopic techniques. The average isotropic crystallite size is ~30 nm. This study yields new insights into ultra‐high density multilevel optical data storage in the frequency domain with the possibility to burn multiple holes to yield higher data storage density at room temperature.

Biography:
Lubina Thattamveedu Kasim has received her Masterʼs in five year Photonics course from International School of Photonics, Cochin University of Science and Technology in 2014, India. She carried out various research projects in the area of Nanophotonics and Laser spectroscopy during the past few years. Lubina is currently a PhD student in Physics at University of New South Wales, Canberra, Australia since 2015. Her current research aimed to develop a UV optical storage medium to enhance the current optical data storage capacity by studying properties of rare earth ion doped nanoparticles. She has attended five conferences and published four conference papers as well as Co-author in Journal publication.

Spectroscopic Investigation of the R1m Line in Alexandrite at Low Temperature and Low Magnetic Fields

Muhammed Ajmal Pallithadathil Nazer* and Hans Riesen

The University of New South Wales, Australia

Optical spectroscopic properties of the R1 line of Cr3+ in the mirror site of alexandrite (BeAl2O4:Cr3+) were investigated by high resolution laser spectroscopy. The transitions between the 4A2 to 2E levels were studied by polarised absorption measurement at 2.1K and the excited state splitting of 2E level was found to be 36.6cm‐1. The fluorescent lifetime of Cr3+ ions occupying the mirror site was measured as 2.3ms. This is caused by the effect of photon trapping due to radiative energy transfer in the 2E state, increasing the lifetime from 1.3ms at 2.1K. Transient spectral hole‐burning was applied to examine the population dynamics between the atomic levels and the spectral holes were burnt at 679.75nm into the R1m line of at 2.1K by using a narrowband External Cavity Diode Laser. The hole decay time was obtained by probing the hole depths at at different delays. The hole‐burning technique facilitates the observation of Zeeman splittings in very low magnetic fields. Magnetic fields from 0 to 11.8mT were applied to the alexandrite crystal along the three crystal axes and the side holes were observed in the hole‐burning spectra. The applied magnetic field splits the two ground state Kramers doublets (4A2 ±1/2, ±3/2) into four spin levels and the excited state 2E (±1/2) split in to two spin levels, which is directly proportional to the strength of applied magnetic field. An analysis of the patterns allows an accurate determination of the g‐factors in the excited state.

Biography:
Muhammed Ajmal Pallithadathil Nazer is a PhD student at the University of New south Wales Canberra since September 2015. His research is mainly focussed on the generation of slow and fast light by spectral hole-burning in transition metal and rare earth ion doped systems. He holds master degree in opto-electronics and laser technology from Cochin University in India and bachelors in Electronics and communication engineering from Kerala University, India. He has experience in nanotechnology and the development of high power solid-state laseras well. He was an Assistant Professor and presently hold the position of webmaster in IEEE ACT section, Australia. He has attended several conferences in which he published three conference papers and presented four posters in his career.

Implementation of the Quality Management in Radiation Dosimetry Laboratory at ELI-NP Facility

Dorina Aranghel1,2*, Doina Stanciu1, Chivuta-Ramona Badita1,3, Ana Stochioiu1 and Ion Tudor1

1National Institute for Nuclear Physics and Engineering, Romania
2Extreme Light Infrastructure Nuclear Physics (ELI-NP), Romania
3University of Bucharest, Romania

The Radiation Dosimetry Laboratory from ELI-NP assure the implementation of the radiological monitoring program at ELI-NP and provide a necessary basis for its operation (environmental and personal monitoring devices, communicating results and data records) in order to enforce national and international regulations. The Quality Management System (QMS) implementation for Dosimetry Laboratory is under way and will be made in accordance with the new requirements of the standard ISO/IEC 17025:2017. Implementation of QMS in Dosimetry Laboratory demonstrate technical competence, impartiality and integrity concerning laboratory activity profiles.

The laboratory QMS covers all aspects related to radiation monitoring from the analysis of the monitoring request proces of users up to final issuance of Radiation Dosimetry Report. The Quality Manual is the main component of the QMS documentation.

The processes needed for the QMS as well as their succession and interaction have been identified and based on them methods and procedures have been developed to control the operational processes within the laboratory.

This paper presents actions of the identification of risks and opportunities associated in order to QMS implementation in compliance with ISO/IEC 17025:2017.

Biography:
Dorina Aranghel is a senior researcher of IFIN-HH Magurele and she is working at ELI-NP, Magurele. She involved in a research project, occupying the position of project director. In this project she is working on the elaboration of the Quality Management System for the ELI-NP laboratory for the recognition of competence by a national body in the nuclear field, CNCAN. Also, She involved in other projects from our departement and ELI-NP facility.

Structural Changes in the Neutron-Irradiated Chondroitin Sulfate

Chivuta-Ramona Badita1,2*, Dorina Aranghel1,3 and Ana Stochioiu1

1National Institute for Nuclear Physics and Engineering, Romania
2University of Bucharest, Romania
3Extreme Light Infrastructure Nuclear Physics (ELI-NP), Romania

Chondroitin sulfate (CS) is a linear heteropolysaccharide consisting of repeating disaccharide units of glucuronic acid and galactosamine, which is commonly sulfated at C-4 and/or C-6 of galactosamine. Chondroitin sulfate is a molecule that is found naturally in the body. chondroitin sulfate (CS) is a glycosaminoglycan (GAG) covalently linked to proteins forming proteoglycans (PGs). CS exists in our body in cartilage and many types of tissues such as bone, ligament, cornea, brain, blood vessel, and skin.

This work will cover biophysical and microstructural effects of neutron radiation on CS. We were studied the structural parameters of CS by Small-Angle Neutron Scattering. CS was irradiated at Orphee Reactor with a neutron flux of 3 x 1014 neutron/cm2.

For the average energy of 5 meV of neutrons, the total dose delivered to CS from neutrons was calculated. The results show that the dose was of 0.059 mGy and that the addition of divalent cations induces the formation of a hydrogel scaffold.

Biography:
Chivuta-Ramona Badita is assistant researcher of IFIN-HH Magurele and he is working in the research projects. His activities implies research concerning the study of biological samples as well as environmentl and personnel dosimetry using passive dosemeters OSL type. He is working for establishment and elaboration documentation for Qality Management System of dosimetry laboratory from ELI-NP facility.

Conductive Layered Metal–Organic Frameworks: A Chemistry Problem

Francisco Torrens1* and Gloria Castellano2

1Universitat de Valencia, Spain
2Universidad Catolica de Valencia, Spain

Chemistry is not a self contained discipline: It becomes nanochemistry while physics merges with materials science. A way of transforming matter is manufacturing nanomaterials/devices or composites/layers. More is different. The whole becomes not only more than but different from the sum of its parts. Layered metal–organic frameworks are a modular class of materials, with thickness of a few atomic layers. What are they used for? They exhibit properties distinct from the bulk. Since the seminal work of Geim group on the exfoliation of bulk graphite into graphene, layered materials were obtained and characterized as thin-layered nanostructures. Layered metal–organic frameworks are interesting for materials and applications, because of their atomically thin-layered structure, large surface chemical reactivity, high surface/volume ratio and large chemical adsorption capacity. Their structural, electronic and optical properties were used as a learning method. The interlayer distance is greater for MoS2 because of its layered structure, in which a plane of Mo atoms is sandwiched by other planes of S2– ions. The three strata form a monolayer of MoS2. The periodic table of the elements for some layered materials is analyzed: A steadiness results in interlayer distances for B–N in period 2. Design criteria and structure–property relationships are derived: A series of linear models of interatomic distance between layers, vs. atomic number of layered materials, shows that this distance rises with atomic number. Nonlinear power models improved correlations. Interlayer distance for S deviates from the fits because of the three-strata monolayer of MoS2.

Biography:
Francisco Torrens has completed his PhD from Universitat de Valencia, Spain. He is the professor of physical chemistry, in the Department for Physical Chemistry. He has published more than 400 papers in reputed journals and has been serving as an editorial board member of reputed journals. He has collaborated on projects with Professors Rivail, Tomas-Vert, Salgado and Castellano. His scientific accomplishments include the first implementation in a computer at the Universitat de Valencia of a program for the elucidation of crystallographic structures and the construction of the first computational-chemistry program adapted to a vector-facility supercomputer in a Spanish university.

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