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Dissertations / Theses on the topic 'Institute of Radiochemistry'

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Published: 4 June 2021

Last updated: 3 February 2022

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1

Ulrich, K. U., A. Richter, J. Mibus, H. Foerstendorf, and G. Bernhard. "Annual Report 2005 - Institute of Radiochemistry." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28480.

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The Institute of Radiochemistry (IRC), one of the six institutes of the Forschungszentrum Rossendorf (FZR), performs application-oriented research in the fields of radiochemistry and radioecology. Motivation and background of our research are environmental processes relevant for the installation of nuclear waste repositories, for remediation of uranium mining and milling sites, and for radioactive contaminations caused by nuclear accidents and fallout. Due to their high radiotoxicity and long half-life the actinides are of special interest. Hence our research focuses on the chemical behavior of actinides at the molecular level in order to predict the relevant macroscopic processes in the environment. Within this framework, special emphasis is on the interface between geological and biological systems. In the last year our research topics were as follows: # Aquatic chemistry of actinides # Actinides in bio-systems # Interaction of actinides with solid phases # Reactive transport of actinides About 60 scientists, technicians and PhD students are employed in the Institute of Radiochemistry. We have achieved a wide range of new scientific results in the past year, which are presented in this Annual Report. Among them only a few can be highlighted here in this preface. For the first time it was possible to determine uranium speciation in situ in drinking and mineral waters e.g. by a dedicated fluorescence spectrometer at lowest µg/L concentrations. This methodical progress is an important prerequisite to study the uranium toxicity and its dependence on chemical speciation. We were very successful in the determination of formation pathways and structure of various actinide complexes, e.g., the surface complexes of uranium (VI) onto mica and iron hydroxides over a wide range of pH and carbonate concentration. These results contribute to a better understanding of actinide speciation in geo- and bio-systems, especially with respect to the chemical processes on the interfaces. Studies to the interaction of uranium with biofilms, green algae and bacteria coming from extreme habitats extended our research on the field of bio-systems. Major progress in the structural analysis of multiple uranium species has been achieved by applying Monte Carlo simulations and iterative transformation factor analysis to EXAFS spectroscopy. Furthermore, our new radiochemical experimental station at the Free Electron Laser of the Rossendorf accelerator ELBE is now in full operation. We have started first experiments on the uranium and neptunium complexation on selected mineral surfaces.

2

Engelmann, H. J., and G. Bernhard. "Annual Report 2003 - Institute of Radiochemistry." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28908.

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3

Bernhard, G., and Heinz-Jürgen Engelmann. "Institute of Radiochemistry Annual Report 1999." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29989.

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4

Nitsche, Heino, Heinz-Jürgen Engelmann, and Gert Bernhard. "Institute of Radiochemistry; Annual Report 1995." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-31621.

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5

Bernhard, G., K. Viehweger, H. Foerstendorf, and A. Richter. "Annual Report 2006 - Institute of Radiochemistry." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28299.

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6

Viehweger, K., A. Richter, and H. Foerstendorf. "Annual Report 2008 - Institute of Radiochemistry." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-27855.

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7

Foerstendorf, H., A. Richter, G. Bernhard, and K. Viehweger. "Annual Report 2007 - Institute of Radiochemistry." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28000.

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8

Ulrich, K. U., H. Foerstendorf, G. Bernhard, J. Mibus, and A. Richter. "Annual report 2004 - Institute of Radiochemistry." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28726.

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9

Weiß, F. P. "Institute of Radiochemistry Annual Report 2002." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29157.

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10

Fanghänel, Th. "Annual Report 2001 Institute of Radiochemistry." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29463.

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11

Fanghaenel, Th, H. J. Engelmann, and G. Bernhard. "Institute of Radiochemistry; Annual Report 2000." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29601.

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12

Bernhard, Gert, and Heino Nitsche. "Institute of Radiochemistry; Annual Report 1998." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-30545.

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13

Engelmann, Heinz-Jürgen, Gert Bernhard, and Heino Nitsche. "Institute of Radiochemistry; Annual Report 1997." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-30762.

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14

Nitsche, Heino, Gert Bernhard, and Heinz-Jürgen Engelmann. "Institute of Radiochemistry; Annual Report 1994." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-31927.

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15

Engelmann, Heinz-Jürgen, Gert Bernhard, Gerhard Geipel, and Heino Nitsche. "Institute of Radiochemistry; Annual Report 1993." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-32335.

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16

Bernhard, Gert. "Institute of Radiochemistry; Annual Report 1992." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-32595.

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17

Bernhard, G., and K. Viehweger. "Annual Report 2009 - Institute of Radiochemistry." Forschungszentrum Dresden-Rossendorf, 2010. https://hzdr.qucosa.de/id/qucosa%3A22124.

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18

Bernhard, G., and A. Richter. "Annual Report 2011 - Institute of Radiochemistry." Helmholtz-Zentrum Dresden-Rossendorf, 2012. https://hzdr.qucosa.de/id/qucosa%3A22149.

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Abstract:

The Institute of Radiochemistry (IRC) is one of the seven institutes of the Helmholtz-Zentrum Dresden-Rossendorf (HZDR). The research activities are fully integrated into the “Nuclear Safety Research Program” of the Helmholtz Association and focused on the topic “Safety of Nuclear Waste Disposal”. The research objectives are to generate better process understanding and data for the long-term safety analysis of a nuclear waste disposal in the deep geological underground. A better knowledge about the dominating processes essential for radionuclide (actinide) mobilization and immobilization on the molecular level is needed for the assessment of the macroscopic processes which determine the transport and distribution of radioactivity in the environment. Special emphasis is put on the biological mediated transport of long-lived radionuclides in the geosphere and their interaction with different biosystems like biota and human organism for a better calculation of environmental and health risks. Advanced knowledge is needed for description of the processes dominating at the interfaces between geo- and bio-systems related to the distribution of long-lived radionuclides in various bio-systems along the food chain.

19

Bernhard, G., and Heinz-Jürgen Engelmann. "Institute of Radiochemistry Annual Report 1999." Forschungszentrum Rossendorf, 2000. https://hzdr.qucosa.de/id/qucosa%3A21824.

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20

Bernhard, Gert, and Heino Nitsche. "Institute of Radiochemistry; Annual Report 1998." Forschungszentrum Rossendorf, 1999. https://hzdr.qucosa.de/id/qucosa%3A21881.

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21

Engelmann, Heinz-Jürgen, Gert Bernhard, and Heino Nitsche. "Institute of Radiochemistry; Annual Report 1997." Forschungszentrum Rossendorf, 1998. https://hzdr.qucosa.de/id/qucosa%3A21903.

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22

Nitsche, Heino, Heinz-Jürgen Engelmann, and Gert Bernhard. "Institute of Radiochemistry; Annual Report 1995." Forschungszentrum Rossendorf, 1996. https://hzdr.qucosa.de/id/qucosa%3A21989.

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23

Nitsche, Heino, Gert Bernhard, and Heinz-Jürgen Engelmann. "Institute of Radiochemistry; Annual Report 1994." Forschungszentrum Rossendorf, 1995. https://hzdr.qucosa.de/id/qucosa%3A22019.

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24

Engelmann, Heinz-Jürgen, Gert Bernhard, Gerhard Geipel, and Heino Nitsche. "Institute of Radiochemistry; Annual Report 1993." Forschungszentrum Rossendorf, 1994. https://hzdr.qucosa.de/id/qucosa%3A22059.

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25

Bernhard, Gert. "Institute of Radiochemistry; Annual Report 1992." Forschungszentrum Rossendorf, 1993. https://hzdr.qucosa.de/id/qucosa%3A22086.

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26

Bernhard, Gert, Harald Foerstendorf, Anke Richter, and Katrin Viehweger. "Annual Report 2010 - Institute of Radiochemistry." Helmholtz-Zentrum Dresden-Rossendorf, 2011. https://hzdr.qucosa.de/id/qucosa%3A22142.

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Abstract:

At the beginning of 2011, the former Forschungszentrum Dresden-Rossendorf (FZD) was fully integrated into the Helmholtz Association, as Helmholtz-Zentrum Dresden-Rossendorf (HZDR). Therefore, the present Annual Report 2010 of the Institute of Radiochemistry (IRC) is published as the first HZDR-Report. The Institute of Radiochemistry is one of the six Research Institutes of this centre. IRC contributes to the research program “Nuclear Safety Research” in the “Research Field of Energy” and performs basic and applied research in radiochemistry and radioecology. Motivation and background of our research are environmental processes relevant for the installation of nuclear waste repositories, for remediation of uranium mining and milling sites, and for radioactive contaminations caused by nuclear accidents and fallout. Because of their high radiotoxicity and long half-life the actinides are of special interest.

27

Viehweger, K., A. Richter, and H. Foerstendorf. "Annual Report 2008 - Institute of Radiochemistry." Forschungszentrum Dresden-Rossendorf, 2009. https://hzdr.qucosa.de/id/qucosa%3A21612.

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28

Foerstendorf, H., A. Richter, G. Bernhard, and K. Viehweger. "Annual Report 2007 - Institute of Radiochemistry." Forschungszentrum Dresden-Rossendorf, 2008. https://hzdr.qucosa.de/id/qucosa%3A21626.

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29

Bernhard, G., K. Viehweger, H. Foerstendorf, and A. Richter. "Annual Report 2006 - Institute of Radiochemistry." Forschungszentrum Dresden-Rossendorf, 2007. https://hzdr.qucosa.de/id/qucosa%3A21657.

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30

Ulrich, K. U., A. Richter, J. Mibus, H. Foerstendorf, and G. Bernhard. "Annual Report 2005 - Institute of Radiochemistry." Forschungszentrum Rossendorf, 2006. https://hzdr.qucosa.de/id/qucosa%3A21674.

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Abstract:

The Institute of Radiochemistry (IRC), one of the six institutes of the Forschungszentrum Rossendorf (FZR), performs application-oriented research in the fields of radiochemistry and radioecology. Motivation and background of our research are environmental processes relevant for the installation of nuclear waste repositories, for remediation of uranium mining and milling sites, and for radioactive contaminations caused by nuclear accidents and fallout. Due to their high radiotoxicity and long half-life the actinides are of special interest. Hence our research focuses on the chemical behavior of actinides at the molecular level in order to predict the relevant macroscopic processes in the environment. Within this framework, special emphasis is on the interface between geological and biological systems. In the last year our research topics were as follows: # Aquatic chemistry of actinides # Actinides in bio-systems # Interaction of actinides with solid phases # Reactive transport of actinides About 60 scientists, technicians and PhD students are employed in the Institute of Radiochemistry. We have achieved a wide range of new scientific results in the past year, which are presented in this Annual Report. Among them only a few can be highlighted here in this preface. For the first time it was possible to determine uranium speciation in situ in drinking and mineral waters e.g. by a dedicated fluorescence spectrometer at lowest µg/L concentrations. This methodical progress is an important prerequisite to study the uranium toxicity and its dependence on chemical speciation. We were very successful in the determination of formation pathways and structure of various actinide complexes, e.g., the surface complexes of uranium (VI) onto mica and iron hydroxides over a wide range of pH and carbonate concentration. These results contribute to a better understanding of actinide speciation in geo- and bio-systems, especially with respect to the chemical processes on the interfaces. Studies to the interaction of uranium with biofilms, green algae and bacteria coming from extreme habitats extended our research on the field of bio-systems. Major progress in the structural analysis of multiple uranium species has been achieved by applying Monte Carlo simulations and iterative transformation factor analysis to EXAFS spectroscopy. Furthermore, our new radiochemical experimental station at the Free Electron Laser of the Rossendorf accelerator ELBE is now in full operation. We have started first experiments on the uranium and neptunium complexation on selected mineral surfaces.

31

Weiß, F. P. "Institute of Radiochemistry Annual Report 2002." Forschungszentrum Rossendorf, 2003. https://hzdr.qucosa.de/id/qucosa%3A21742.

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32

Ulrich, K. U., H. Foerstendorf, G. Bernhard, J. Mibus, and A. Richter. "Annual report 2004 - Institute of Radiochemistry." Forschungszentrum Rossendorf, 2005. https://hzdr.qucosa.de/id/qucosa%3A21699.

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33

Fanghänel, Th. "Annual Report 2001 Institute of Radiochemistry." Forschungszentrum Rossendorf, 2002. https://hzdr.qucosa.de/id/qucosa%3A21772.

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34

Fanghaenel, Th, H. J. Engelmann, and G. Bernhard. "Institute of Radiochemistry; Annual Report 2000." Forschungszentrum Rossendorf, 2000. https://hzdr.qucosa.de/id/qucosa%3A21788.

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35

Engelmann, H. J., and G. Bernhard. "Annual Report 2003 - Institute of Radiochemistry." Forschungszentrum Rossendorf, 2004. https://hzdr.qucosa.de/id/qucosa%3A21717.

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36

Bernhard, Gert. "Institute of Radiochemistry, Report January 1998 - June 1999." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-30243.

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37

Bernhard, Gert. "Institute of Radiochemistry, Report January 1998 - June 1999." Forschungszentrum Rossendorf, 1999. https://hzdr.qucosa.de/id/qucosa%3A21851.

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38

Bernhard, Gert, Heino Nitsche, and Heinz-Jürgen Engelmann. "Institut of Radiochemistry; Annual Report 1996." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-31158.

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39

Bernhard, Gert, Heino Nitsche, and Heinz-Jürgen Engelmann. "Institut of Radiochemistry; Annual Report 1996." Forschungszentrum Rossendorf, 1997. https://hzdr.qucosa.de/id/qucosa%3A21942.

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40

"Annual Report 2010 - Institute of Radiochemistry." Helmholtz-Zentrum Dresden-Rossendorf, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-72900.

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Abstract:

At the beginning of 2011, the former Forschungszentrum Dresden-Rossendorf (FZD) was fully integrated into the Helmholtz Association, as Helmholtz-Zentrum Dresden-Rossendorf (HZDR). Therefore, the present Annual Report 2010 of the Institute of Radiochemistry (IRC) is published as the first HZDR-Report. The Institute of Radiochemistry is one of the six Research Institutes of this centre. IRC contributes to the research program “Nuclear Safety Research” in the “Research Field of Energy” and performs basic and applied research in radiochemistry and radioecology. Motivation and background of our research are environmental processes relevant for the installation of nuclear waste repositories, for remediation of uranium mining and milling sites, and for radioactive contaminations caused by nuclear accidents and fallout. Because of their high radiotoxicity and long half-life the actinides are of special interest.

41

"Annual Report 2011 - Institute of Radiochemistry." Helmholtz-Zentrum Dresden-Rossendorf, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-85372.

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Abstract:

The Institute of Radiochemistry (IRC) is one of the seven institutes of the Helmholtz-Zentrum Dresden-Rossendorf (HZDR). The research activities are fully integrated into the “Nuclear Safety Research Program” of the Helmholtz Association and focused on the topic “Safety of Nuclear Waste Disposal”. The research objectives are to generate better process understanding and data for the long-term safety analysis of a nuclear waste disposal in the deep geological underground. A better knowledge about the dominating processes essential for radionuclide (actinide) mobilization and immobilization on the molecular level is needed for the assessment of the macroscopic processes which determine the transport and distribution of radioactivity in the environment. Special emphasis is put on the biological mediated transport of long-lived radionuclides in the geosphere and their interaction with different biosystems like biota and human organism for a better calculation of environmental and health risks. Advanced knowledge is needed for description of the processes dominating at the interfaces between geo- and bio-systems related to the distribution of long-lived radionuclides in various bio-systems along the food chain.