Annual Report 2009/2010 - JUWEL - Forschungszentrum Jülich

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applicability of the gelation in dependence on the formulation, as the GP always has to be higher than the ambient temperature. Therefore, a certain minimum of the urea amount is necessary to stabilize the precursor solution. Fig. 49: Determination of the gelation point via viscosity Fig. 50: Gelation field U 0.9 /Nd 0.1 (red mesh area for illustration only). Irradiation of urea and/or hexa-methylene-tetraamine containing solutions As the stability of a precursor solution may be altered by radiation fields introduced by the present nuclides, as for example Am, it is important to investigate radiolysis mechanisms of these compounds. Therefore, irradiations with different dose rates of urea and HMTA containing solutions were carried out. These experiments took place in corporation with Chalmers University, Gothenburg, Sweden. After irradiation, the samples were sent to <strong>Jülich</strong> research centre for characterisation. Tab. 16 gives an overview about the samples and their irradiation. 77
Optical investigation showed a noticeable change of colour in all HMTA containing solutions. Nevertheless, the IR spectra (see Fig. 51) of the samples before and after radiation with the highest dose rate show no noticeable difference. It can be assumed that only a very small amount of the chemicals underwent radiolytic reactions. This stability against radiolysis is crucial for the future steps of the gelation, substituting a minor-actinide simulate with Pu or Am. Tab. 16: Samples for -irradiation. Number Content Dose 1 Urea-Solution, 2.8 mol/L 9,1 kGy 2 HMTA-Solution, 2.8 mol/L 9,1 kGy 3 HMTA/Urea-Solution, 2.8 mol/L 9,1 kGy 4 Urea-Solution, 2.8 mol/L 91 kGy 5 HMTA-Solution, 2.8 mol/L 91 kGy 6 HMTA/Urea-Solution, 2.8 mol/L 91 kGy 7 Urea-Solution, 2.8 mol/L 910 kGy 8 HMTA-Solution, 2.8 mol/L 910 kGy 9 HMTA/Urea-Solution, 2.8 mol/L 910 kGy Fig. 51: IR-Spectra of unirradiated (left) and irradiated (right) (1000 kGy) solution Nr. 9. Fabrication of uranium / neodymium spheres using acid-deficient-uranyl-nitrate Subsequent to the work carried out before, microspheres utilising acid-deficient-uranyl-nitrate (ADUN) were synthesised. According to the flowsheet shown in Fig. 52, the fabrication took place. As can be seen from Tab. 17, the advantage of using ADUN is the lower amount of needed HMTA in relation to the amount of metal-ions, as well as a higher metal-density in the gel due to a higher initial uranium concentration. The lower relative HMTA amount finds reason in the also lower acidity related to the uranium-concentration. Therefore less base is needed for a hydrolysis reaction that causes gelation. 78
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Mitglied Mitglied der der Helmholtz
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Forschungszentrum Jülich GmbH Inst
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TABLE OF CONTENTS 1 Preface .......
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6.2.2 Doctoral Thesis .............
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state of NRW. The collaborative pro
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2 Institute’s Profile Due to the
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2.2. Organization chart Reactor Saf
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3 Key Research Topics 3.1. Long Ter
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actinide co-conversion into polyact
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Fig. 7: Non-destructive analytical
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Fig. 9: Thermal treatment of an AVR
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3.8. Product Quality Control of Rad
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3.8.2 Product Quality Control of Lo
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The advantage of working at low vac
Page 31 and 32: NdPO 4 powder sample, directly rece
Page 33 and 34: 4.5. Non-destructive assay testing
Page 35 and 36: 5 Scientific and Technical Reports
Page 37 and 38: Results and Discussion The irradiat
Page 39 and 40: work will focus on the identificati
Page 41 and 42: Different solvents (iso-propanol an
Page 43 and 44: e & j) Aggregates of aluminium oxid
Page 45 and 46: Experimental details The corrosion
Page 47 and 48: Intensity [CPS] 500 400 300 200 100
Page 49 and 50: Fig. 24: Left: High resolution TEM
Page 51 and 52: a) MD model [10] b) Derived Lesukit
Page 53 and 54: 5.4. Minor actinide(III) recovery f
Page 55 and 56: Extensive extraction studies were p
Page 57 and 58: of the extraction properties of the
Page 59 and 60: Cm(III) together with the lanthanid
Page 61 and 62: using a mixture of CyMe4BTBP and TO
Page 63 and 64: A more challenging route studied wi
Page 65 and 66: These preliminary results show that
Page 67 and 68: The 1-cycle SANEX process is intend
Page 69 and 70: Continuous counter-current tests us
Page 71 and 72: Conclusion In this work, it was sho
Page 73 and 74: shaken by a vortex mixer for 15 min
Page 75 and 76: 100 100 Distribution ratio 10 1 0.1
Page 77 and 78: Tab. 15: The distribution ratios of
Page 79 and 80: 5.7. Synthesis and thermal treatmen
Page 81: Acid-Deficient Uranyl-Nitrate via d
Page 85 and 86: TG /% 100 98 96 94 92 90 88 86 84 8
Page 87 and 88: Radiolysis in the aqueous solutions
Page 89 and 90: is about 4% while the one of the rh
Page 91 and 92: Fig. 59: Compressibility curve for
Page 93 and 94: Conclusion and outlook Monazite-typ
Page 95 and 96: Fig. 63: Description of the unit ce
Page 97 and 98: agents for the synthesis of neodymi
Page 99 and 100: 100 TG 785°C Exo DSC 0,2 0,0 90 -0
Page 101 and 102: After synthesis the product was cen
Page 103 and 104: process of monazite and additional
Page 105 and 106: Tab. 18: Lattice parameters determi
Page 107 and 108: Conclusions For Sm 1-x Ce x PO 4 mo
Page 109 and 110: 5.11. Raman Spectra of Synthetic Ra
Page 111 and 112: The numerical values of all measure
Page 113 and 114: knowledge, these special relationsh
Page 115 and 116: Fig. 80: Raman spectra of LaPO 4 ir
Page 117 and 118: 5.12. MC simulation of thermal neut
Page 119 and 120: content was replaced by hydrogen. C
Page 121 and 122: constant for hydrogen concentration
Page 123 and 124: with a 0 1 -183.88 ± 8.55 and a 2
Page 125 and 126: 5.13. An Improved Method for the no
Page 127 and 128: 2 2 2 d0 R ds d0 dw la( )
Page 129 and 130: The relative uncertainty for the ac
Page 131 and 132: In the drum, 4 ‘hot spots’ for
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activity of Cs-137 is much more und
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gamma-ray detector approximated by
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shown in Fig. 96. In both cases the
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econstruction than the old calculat
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Neutron capture cross sections and
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Outlook The evaluated data will be
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from carbon-based HTR fuel elements
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Fig. 102: 3D volume reconstructions
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dislocate the 14 C atom from its pr
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It can be seen that nearly all trit
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Acknowledgement The authors like to
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development by investigations of ga
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Fig. 109: The left picture shows th
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[2] A European Roadmap for Developi
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from airborne SWIR Full Spectrum Im
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Fig. 113: Visualization of the vege
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number of training samples up to 19
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Acknowledgements The work presented
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three approaches has severe drawbac
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neighbours from the list of merge c
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it gives a difference in segmentati
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[6] I. Niemeyer, F. Bachmann, A. Jo
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Monitoring 3 cooperated intensively
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facilities and other treaty related
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parameters of the SAR system, such
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The MGD products used in the study
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Fig. 134 contains the result for th
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[2] H. Maître (ed.), Processing of
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Preparatory Committee to allocate t
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unconditional security assurances f
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safeguards was also requested. Deci
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[16] United Nations Security Counci
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5.24. Development and Application o
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Hardware layer The hardware layer i
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So in most applications the scale u
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The ENDF-B/V and ENDF-B/VI librarie
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5.26. Product control of waste prod
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Polysiloxane which has been investi
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acceptance requirements [3]. In the
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Fig. 145: List of description and d
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6.1. Courses taught at universities
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Umwelt / Energy & Environment 2010;
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6.5. Institute Seminar The IEK-6 or
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6.5.3 Invited talks 2009 30.04.2009
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21.09.2010 Dr. N. Evans: The Chemis
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8 Selected R&D projects 8.1. EU pro
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K. Aymanns: Nominated as deputy re
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Bukaemskiy A.A., Barrier D., Modolo
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11.2. Publications 2009 11.2.1 Jour
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Rezniczek, A.; Richter, B.; Jussofi
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Daniels, H.: Co-conversion of actin
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11.3. Publications 2010 11.3.1 Jour
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Sypula, M.; Wilden, A.; Schreinemac
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(Partitioning) - Stabilitätsunters
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Modolo, G.; Bosbach, D.; Geist, A.;
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12 How to reach us Postal Address F
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By train: Take the train from Aache
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Schriften des Forschungszentrums J
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