TY - JOUR A1 - Görner, Wolf A1 - Haase, Oskar A1 - Ostermann, Markus A1 - Segebade, Christian T1 - Instrumental analysis of phosphorus in organic material using high energy beta-counting after photoactivation (IPAA) N2 - C, N, O, F and P can be analyzed by instrumental photon activation analysis (IPAA) including decay curve analysis. The interference of 30P (T1/2 = 149.9 s) by 15O (T1/2 = 122.2 s) can be ruled out by direct positron measurement making use of the largely different maximum β+-energies of both nuclides (3.24 MeV and 1.73 MeV, respectively). Interference by carbon (11C) can be avoided by sub-threshold activation with 17 MeV bremsstrahlung. The short half-life of 30P allows a high productivity of the method. Reliability was demonstrated in the range of 0.2%–2% P (detection limit = 40 µg/g). Analysis of a certified reference material (BCR-CRM 063) yielded excellent agreement with the certified data. KW - Instrumental analysis KW - Phosphorus KW - Photon activation PY - 2008 DO - https://doi.org/10.1007/s10967-007-0441-5 SN - 0236-5731 SN - 1588-2780 SN - 1417-2097 VL - 276 IS - 1 SP - 251 EP - 255 PB - Elsevier Sequoia CY - Lausanne AN - OPUS4-19157 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Görner, Wolf A1 - Alber, D. A1 - Berger, Achim A1 - Haase, Oskar A1 - Monse, G. A1 - Segebade, Christian T1 - BEAMGAA - A chance for high precision analysis of big samples N2 - In activation analysis of traces in small samples, the non-equivalence of the activating radiation doses of sample and calibration material gives rise to sometimes tolerable systematic errors. Conversely, analysis of major components usually demands high trueness and precision. To meet this, beam geometry activation analysis (BEAMGAA) procedures have been developed for instrumental photon (IPAA) and neutron activation analysis (INAA) in which the activating neutron/photon beam exhibits broad, flat-topped characteristics. This results in a very low lateral activating flux gradient compared to known radiation facilities, however, at significantly lower flux density. The axial flux gradient can be accounted for by a monitor-sample-monitor assembly. As a first approach, major components were determined in high purity substances as well as selenium in a cattle fodder additive. T2 - 6th International Conference "Methods and Applications of Radioanalytical Chemistry" CY - Kailua-Kona, HI, United States of America DA - 2003-04-07 KW - Beam geometry activation analysis KW - Flux gradients KW - Measurement regime KW - Representativity KW - Big samples PY - 2005 DO - https://doi.org/10.1007/s10967-005-0660-6 SN - 0236-5731 SN - 1588-2780 SN - 1417-2097 VL - 263 IS - 3 SP - 791 EP - 796 PB - Elsevier Sequoia CY - Lausanne AN - OPUS4-6907 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dudek, Gabriele A1 - Alber, D. A1 - Pritzkow, Wolfgang A1 - Riebe, Gundel A1 - Vogl, Jochen A1 - Görner, Wolf T1 - Determination of the beta- branching ratio of 64Cu by mass spectrometric investigations of the decay products in neutron transmuted copper N2 - The ?- branching ratio of 64Cu was determined by investigating the resulting decay products in copper doped by neutron transmutation. The numbers of 64Zn and 64Ni atoms were analyzed using isotope dilution analysis combined with thermal ionization mass spectrometry. A ?- branching ratio of (38.06±0.30)% was obtained, which agrees with the study of Kawada (Appl. Radiat. Isot. 37 (1) (1986) 7) to a higher accuracy. However, our result differs from the value cited in the NUDAT database of (39.0±0.3)%. KW - NTD KW - Copper KW - Zinc KW - Nickel KW - Branching ratio KW - Cu-64 KW - TIMS KW - IDMS KW - Isotope dilution KW - Thermal ionization mass spectrometry KW - Neutron transmutation doping PY - 2002 DO - https://doi.org/10.1016/S0969-8043(01)00180-4 SN - 0883-2889 SN - 0969-8043 N1 - Geburtsname von Dudek, Gabriele: Wermann, G. - Birth name of Dudek, Gabriele: Wermann, G. VL - 56 SP - 145 EP - 151 PB - Elsevier CY - Amsterdam AN - OPUS4-7221 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Görner, Wolf A1 - Berger, Achim A1 - Ecker, Klaus A1 - Haase, Oskar A1 - Hedrich, Martina A1 - Segebade, Christian A1 - Weidemann, Gerd A1 - Dudek, Gabriele T1 - Broad band application of combined instrumental photon and neutron activation analysis PY - 2001 SN - 0236-5731 SN - 1588-2780 SN - 1417-2097 N1 - Geburtsname von Dudek, Gabriele: Wermann, G. - Birth name of Dudek, Gabriele: Wermann, G. VL - 248 IS - 1 SP - 45 EP - 52 PB - Elsevier Sequoia CY - Lausanne AN - OPUS4-11229 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dudek, Gabriele A1 - Görner, Wolf A1 - Gawlik, D. A1 - Alber, D. T1 - Use of neutron transmutation doping for the preparation of a new candidate reference material for zinc determination in metallic copper N2 - A new application of neutron transmutation doping is described. The method is useful to prepare graded zinc contents in highly pure copper materials. The research reactor BER II at the Hahn-Meitner-Institute, Berlin served as a neutron source. The zinc content produced in the samples was analyzed by determining the 65Zn-activity via gamma-spectrometry. Simultaneously irradiated flux monitors were used to determine the neutron flux density. Since cylindrical sample geometries are favorable for a reference material application in optical emission (OE) spectroscopy, the spatial distribution of the induced activity in a cylinder with a diameter of 8 mm and a length of 35 mm was investigated. PY - 2000 DO - https://doi.org/10.1023/A:1006723718395 SN - 0236-5731 SN - 1588-2780 SN - 1417-2097 N1 - Geburtsname von Dudek, Gabriele: Wermann, G. - Birth name of Dudek, Gabriele: Wermann, G. VL - 245 IS - 1 SP - 87 EP - 90 PB - Elsevier Sequoia CY - Lausanne AN - OPUS4-11230 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Müller, Bernd R. A1 - Görner, Wolf A1 - Hentschel, Manfred P. A1 - Riesemeier, Heinrich A1 - Krumrey, M. A1 - Ulm, G. A1 - Diete, W. A1 - Klein, U. A1 - Frahm, R. T1 - BAMlin - the first hard X-ray beamline at BESSY II N2 - The first hard X-ray beamline at BESSY II will be installed by BAM and PTB at a superconducting 7 T wavelength shifter. The main optical elements of the beamline are a Double-Multilayer-Monochromator and a Double-Crystal-Monochromator. The two devices can be used separately or in-line. Main applications of monochromatic radiation with photon energies up to 50 keV are X-ray fluorescence analysis, micro-computed tomography, X-ray topography, detector calibration and reflectometry. Calculable undispersed radiation up to 200 keV will be available for radiometric applications. KW - Double-Multilayer-Monochromator with meridional bender KW - Double-Crystal-Monochromator with sagittal bender KW - X-ray fluorescence analysis KW - Micro-computed tomography KW - X-ray topography KW - Detector calibration KW - Reflectometry PY - 2001 DO - https://doi.org/10.1016/S0168-9002(01)00466-1 SN - 0168-9002 SN - 0167-5087 VL - 467-468 IS - 1 SP - 703 EP - 706 PB - North-Holland CY - Amsterdam AN - OPUS4-1171 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rack, A. A1 - Zabler, S. A1 - Müller, Bernd R. A1 - Riesemeier, Heinrich A1 - Weidemann, Gerd A1 - Lange, Axel A1 - Goebbels, Jürgen A1 - Hentschel, Manfred P. A1 - Görner, Wolf T1 - High resolution synchrotron-based radiography and tomography using hard X-rays at the BAMline (BESSY II) N2 - The use of high brilliance and partial coherent synchrotron light for radiography and computed tomography (CT) allows to image micro-structured, multi-component specimens with different contrast modes and resolutions up to submicrometer range. This is of high interest for materials research, life science and non-destructive evaluation applications. An imaging setup for microtomography and radiography installed at BESSY II (a third generation synchrotron light source located in Berlin, Germany) as part of its first hard X-ray beamline (BAMline) can now be used for absorption, refraction as well as phase contrast — dedicated to inhouse research and applications by external users. Monochromatic synchrotron light between 6 keV and 80 keV is attained via a fully automated double multilayer monochromator. For imaging applications the synchrotron beam transmitted by the sample is converted with a scintillator into visible light. By use of microscope optics this luminescence image is then projected onto, e.g., a CCD chip. Several scintillating materials are used in order to optimise the performance of the detector system. Different optical systems are available for imaging ranging from a larger field of view and moderate resolutions (macroscope — up to 14 mm x 14 mm field of view) to high resolution (microscope — down to 0.35 μm pixel size), offering magnifications from 1.8× to 40×. Additionally asymmetric cut Bragg crystals in front of the scintillator can be used for a further magnification in one dimension by a factor of about 20. Slow and fast cameras are available, with up to 16 bit dynamic range. We show the suitability of the setup for numerous applications from materials research and life science. KW - Microtomography KW - Non-destructive evaluation KW - Synchrotron instrumentation KW - Coherent imaging KW - X-ray refraction KW - Phase contrast KW - Holotomography KW - Synchrotron-CT KW - Scintillator KW - Bragg magnification PY - 2008 DO - https://doi.org/10.1016/j.nima.2007.11.020 SN - 0168-9002 SN - 0167-5087 VL - 586 IS - 2 SP - 327 EP - 344 PB - North-Holland CY - Amsterdam AN - OPUS4-17738 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Reiche, I. A1 - Radtke, Martin A1 - Berger, Achim A1 - Görner, Wolf A1 - Ketelsen, T. A1 - Merchel, Silke A1 - Riederer, J. A1 - Riesemeier, Heinrich A1 - Roth, M. T1 - Spatially resolved synchrotron-induced X-ray fluorescence analyses of metal point drawings and their mysterious inscriptions N2 - Synchrotron-induced X-ray fluorescence (Sy-XRF) analysis was used to study the chemical composition of precious Renaissance silverpoint drawings. Drawings by famous artists such as Albrecht Dürer (1471–1528) and Jan van Eyck (approximately 1395–1441) must be investigated non-destructively. Moreover, extremely sensitive synchrotron- or accelerator-based techniques are needed since only small quantities of silver are deposited on the paper. New criteria for attributing these works to a particular artist could be established based on the analysis of the chemical composition of the metal points used. We illustrate how analysis can give new art historical information by means of two case studies. Two particular drawings, one of Albrecht Dürer, showing a profile portrait of his closest friend, “Willibald Pirckheimer” (1503), and a second one attributed to Jan van Eyck, showing a “Portrait of an elderly man”, often named “Niccolò Albergati”, are the object of intense art historical controversy. Both drawings show inscriptions next to the figures. Analyses by Sy-XRF could reveal the same kind of silverpoint for the Pirckheimer portrait and its mysterious Greek inscription, contrary to the drawing by Van Eyck where at least three different metal points were applied. Two different types of silver marks were found in this portrait. Silver containing gold marks were detected in the inscriptions and over-subscriptions. This is the first evidence of the use of gold points for metal point drawings in the Middle Ages. KW - Sy-XRF analysis KW - Drawing KW - Metal point KW - Albrecht Dürer KW - Jan van Eyck KW - Renaissance PY - 2004 DO - https://doi.org/10.1016/j.sab.2004.07.023 SN - 0584-8547 SN - 0038-6987 VL - 59 IS - 10-11 SP - 1657 EP - 1662 PB - Elsevier CY - Amsterdam AN - OPUS4-4575 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Reiche, I. A1 - Berger, Achim A1 - Görner, Wolf A1 - Merchel, Silke A1 - Radtke, Martin A1 - Riederer, J. A1 - Riesemeier, Heinrich A1 - Roth, M. T1 - Following the traces of Albrecht Dürer: analysis of silverpoint drawings by spatially resolved synchrotron-induced X-ray fluorescence analysis N2 - Spatially resolved X-ray fluorescence analysis using synchrotron radiation (SR-XRF) at the wavelength shifter beamline, BAMline, at BESSY was used to investigate Renaissance silverpoint drawings as it is extremely sensitive, non-destructive and can be carried out in air using an excitation spot in the hundred micrometer range. This paper deals with first results of the study of silverpoint drawings of Albrecht Dürer (1471–1528) belonging to the sketchbook that Albrecht Dürer used during a travel to the Netherlands in 1520/21. These results are compared to a PIXE study performed on drawings from the same sketchbook. The minor element composition of the silverpoint used for the drawings in the sketchbook was (10.6 ± 3.5) wt.% of Cu and traces of Zn. Mercury was found in the marks but does not belong to the initial composition of the silverpoint as it is attributed to an alteration phenomenon. One drawing of the sketchbook represents an exception. It consists of silver marks containing an additional minor element, Zn, in the marks and was, therefore, created with another silverpoint, probably at a different time than the other drawings. KW - Synchrotron KW - SR-XRF analysis KW - Drawing KW - Silverpoint KW - Albrecht Dürer PY - 2004 DO - https://doi.org/10.1016/j.nimb.2004.03.081 SN - 0168-583X SN - 1872-9584 VL - 226 IS - 1-2 SP - 83 EP - 91 PB - Elsevier CY - Amsterdam AN - OPUS4-4574 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Riesemeier, Heinrich A1 - Ecker, Klaus A1 - Görner, Wolf A1 - Müller, Bernd R. A1 - Radtke, Martin A1 - Krumrey, M. T1 - Layout and first XRF Applications of the BAMline at BESSY II+ N2 - The first hard x-ray beamline at BESSY II has been installed by BAM and PTB at a superconducting 7 T wavelength shifter. The main optical elements of the beamline are a double-multilayer monochromator and a double-crystal monochromator. Depending on the application, the two devices are used separately or in-line. The main applications of the monochromatic radiation with photon energies up to 60 keV are x-ray fluorescence analysis, micro computed tomography, x-ray topography, detector calibration and reflectometry. Calculable undispersed radiation up to 200 keV is available for radiometric applications. KW - BAMline KW - XRF PY - 2005 DO - https://doi.org/10.1002/xrs.750 SN - 0049-8246 VL - 34 IS - 2 SP - 160 EP - 163 PB - Wiley CY - Chichester AN - OPUS4-11929 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -