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2. Calorimetric Non-Destructive Assay of Large Volume and Heterogeneous Radioactive Waste Drums

Author

Kubinski W. R., Carasco C., Kikola D., Mathonat C., Ricard D., Tefelski D., and Tietze-Jaensch H.

Subjects
Physics, QC1-999
Abstract

The EU-CHANCE project aims at the issue of the characterization of conditioned radioactive waste (CRW) and one objective of CHANCE is to focus on: Calorimetry as a comprising non-destructive technique to reduce uncertainties on the inventory of radwaste containing shielded and hidden material difficult to be measured by other means. A MCNP6-based numerical study comprising the particle flux out of a 200L mock-up drum in a Large Volume Calorimeter (LVC) currently manufactured by KEP Nuclear (France) will be presented and discussed. For the analyses, the particle flux and energy deposition in each layer of the calorimeter were determined. The results yield that a significant fraction of the radiation would leave the system and not contribute to the measurable heat deposition. The expected energy deposition is obtained and cumulated for each layer over the whole energy range revealing the fraction of particles actually escaping the LVC calorimeter. While this escape fraction needs and can be determined, the LVC is a very suitable apparatus for the anticipated experiments on large and heterogeneous waste drums that possibly contain deeply buried beta-emitters (e.g. Sr/Y-90) or shielded alpha-sources hidden inside the drum with a significant level of gamma and neutron radiation background radiation. The high-energy part of this gamma and neutron flux may even reach the reference chamber of the calorimeter and deposit some energy there, compromising the calibration and may cause a double-bias.

Published
2020
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5. Ice moderator experiments at very low temperatures: Comparison of experimental data with Monte Carlo simulations using new scattering law data S(α,β, T)

Author

Nünighoff, K., Pohl, Ch., Bollini, V., Bubak, A., Conrad, H., Filges, D., Glückler, H., Goldenbaum, F., Hansen, G., Lensing, B., Neef, R. -D., Paul, N., Prasuhn, D., Pysz, K., Schaal, H., Soltner, H., Stelzer, H., Tietze-Jaensch, H., Bernnat, W., Keinert, J., Mattes, M., Ninaus, W., Koulikov, S., Smirnov, A., and Wohlmuther, M.

Published
2004
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8. Calorimetric Non-Destructive Assay of Large Volume and Heterogeneous Radioactive Waste Drums.

Author

Lyoussi, A., Giot, M., Carette, M., Jenčič, I., Reynard-Carette, C., Vermeeren, L., Snoj, L., Le Dû, P., Kubinski, W. R., Carasco, C., Kikola, D., Mathonat, C., Ricard, D., Tefelski, D., and Tietze-Jaensch, H.

Subjects
NONDESTRUCTIVE testing, CALORIMETRY, NEUTRON flux, RADIOACTIVE wastes, NUMERICAL analysis
Abstract

The EU-CHANCE project aims at the issue of the characterization of conditioned radioactive waste (CRW) and one objective of CHANCE is to focus on: Calorimetry as a comprising non-destructive technique to reduce uncertainties on the inventory of radwaste containing shielded and hidden material difficult to be measured by other means. A MCNP6-based numerical study comprising the particle flux out of a 200L mock-up drum in a Large Volume Calorimeter (LVC) currently manufactured by KEP Nuclear (France) will be presented and discussed. For the analyses, the particle flux and energy deposition in each layer of the calorimeter were determined. The results yield that a significant fraction of the radiation would leave the system and not contribute to the measurable heat deposition. The expected energy deposition is obtained and cumulated for each layer over the whole energy range revealing the fraction of particles actually escaping the LVC calorimeter. While this escape fraction needs and can be determined, the LVC is a very suitable apparatus for the anticipated experiments on large and heterogeneous waste drums that possibly contain deeply buried beta-emitters (e.g. Sr/Y-90) or shielded alpha-sources hidden inside the drum with a significant level of gamma and neutron radiation background radiation. The high-energy part of this gamma and neutron flux may even reach the reference chamber of the calorimeter and deposit some energy there, compromising the calibration and may cause a double-bias. [ABSTRACT FROM AUTHOR]

Published
2020
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10. ENTRAP and its potential interaction with European networks

Author

-Jaensch, H. Tietze, primary, Van Iseghem, P., additional, Boucher, L., additional, Dodaro, A., additional, Fuks, L., additional, Guisset, J. P., additional, Koivuranta, S., additional, Lierse, C., additional, Neckel, W., additional, Piña, G., additional, Steyer, S., additional, Van Velzen, L., additional, and del Cerro, E. Vico, additional

Published
2015
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12. Organo-ruthenium supported heteropolytungstates : synthesis, structure, electrochemistry, and oxidation catalysis

Author

Bi, L. -H, Al-Kadamany, G., Chubarova, Elena V., Dickman, M. H., Chen, L., Gopala, D. S., Richards, R. M., Kelta, B., Nadjo, L., Jaensch, H., Mathys, G., Kortz, U., Bi, L. -H, Al-Kadamany, G., Chubarova, Elena V., Dickman, M. H., Chen, L., Gopala, D. S., Richards, R. M., Kelta, B., Nadjo, L., Jaensch, H., Mathys, G., and Kortz, U.

Abstract

The reaction of [Ru(arene)Cl2]2 (arene = benzene, p-cymene) with [X2W22O74(OH)2] 12- (X = SbIII, BiIII) In buffer medium resulted In four organo-ruthenium supported heteropolytungstates, [Sb 2W20O70(RuC6H6) 2]10 (1), [Bi2W20O 70(RuC6H6)2]10- (2), [Sb2W20O7o(RuC10H14) 2]10- (3), and [Bi2W20O 70(RuC10H14)2]10- (4), which have been characterized in solution by multinuclear (183W, 13C, 1H) NMR, UV-vis spectroscopy, electrochemistry, and in the solid state by single-crystal X-ray diffraction, IR spectroscopy, thermogravimetric analysis, and elemental analysis. Polyanions 1, 2, and 4 crystallize in the triclinic system, space group P1 with the following unit cell parameters: K5Na5[Sb2W20O 7o(RuC6H6)2]·22H 2O (KNa-1), a= 12.1625(2)Å, b = 13.1677(2) Å, C= 16.0141(3)Å α = 78.9201 (7)°, β = 74.4442(8)°, γ = 78.9019(8)°, and Z= 1 ; Cs2Na8[Bi2W 20O7o(RuC6H6)2] · 30H2O (CsNa-2), a = 11.6353(7) Å b = 13.3638(7) Å, C= 16.7067(8) Å, a = 79.568(2)°, β = 71.103(2)°, γ = 80.331(2)°, and Z= 1; Na10[Bi2W20O 70(RuC10H14)2]-35H20 (Na-4), a = 15.7376(12) Å b = 15.9806(13) Å, c = 24.2909(19) Å, α = 92.109(4)°, β = 101.354(4)°, γ = 97.365(3)°, and Z= 2. Polyanions 1-4 consist of two (L)Ru2+ (L = benzene or p-cymene) units linked to a [X2W20O70]14 (X=Sb III BiIII fragment via Ru-O(W) bonds resulting in an assembly with idealized C2h symmetry. Polyanions 1-4 are stable in solution as indicated by the expected 183W, 13C, and 1H NMR spectra. The electrochemistry of 1-4 is described by considering the reduction and the oxidation processes. The nature of the arene In Ru(arene) has practically no influence on the formal potentials of the W-centers, which are more sensitive to the Sb or Bi hetera atoms. The results suggest that the respective Sb- and Bi derivatives have very different pK a values, with the reduced form of 1 being the most basic, thus permitting the observation of two well-developed voltammetric waves at pH 6. In contrast, the identity of the arene influences the oxidation processes, QC 20141007

Published
2009
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13. The ESS project. Vol. 1. European source of science

Author

Bohn, F.H., Clausen, K.N., Claver, A.Cywinski, Frick, F., Rögener, W., Stahl-Busse, B., Steigenberger, U., Tietze-Jaensch, H., Tindemans, P., Bohn, F.H., Clausen, K.N., Claver, A.Cywinski, Frick, F., Rögener, W., Stahl-Busse, B., Steigenberger, U., Tietze-Jaensch, H., and Tindemans, P.

Published
2003

14. The ESS project. Vol. 3. Technical report

Author

Bohn, F.H,., Bongardt, K., Carsughi, F., Claver, A., Clausen,K.N., Desailly, C., Fabi, P., Gardner, I., Hake, C., Laclare, J.-L., Palanque, S.: Richter, Tietze-Jaensch, H., Bohn, F.H,., Bongardt, K., Carsughi, F., Claver, A., Clausen,K.N., Desailly, C., Fabi, P., Gardner, I., Hake, C., Laclare, J.-L., Palanque, S.: Richter, and Tietze-Jaensch, H.

Published
2003

27. Magnetic excitations in Co2SiO4

Author

Schmidt, W., primary, Brotzeller, C., additional, Schweiss, P., additional, Tietze-Jaensch, H., additional, Geick, R., additional, and Treutmann, W., additional

Published
1995
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46. Small angle neutron scattering from oxygen precipitates in silicon.

Author

Tietze-Jaensch, H., Sieger, D., Geick, R., Zulehner, W., and Geyer, A.

Abstract

The formation of silicon oxide precipitates from Czochralski grown silicon depends on the time and temperature of the heat treatment as well as on the initial content of interstitially dissolved oxygen. Samples containing between 5×10 O/cm and 13×10 O/cm have been heated at 750° C for 96 h. SiO precipitates of various shape and size have been obtained and investigated by means of small angle neutron scattering (SANS) in the Q-range 0.05 Å< Q<0.2 Å. The obtained SANS patterns reveal a typical anisotropy of their intensity distribution, which splits into a central peak at Q<0.1 Å due to the shape of the individual particles and a number of weak intensities for large Q-values, originating from a correlation between defects, possibly between the precipitates. While these correlation peaks in the SANS patterns are seen best for rather low values of about (5-7)×10 O/cm oxygen content, the central peak anisotropy is most pronounced for higher values of ca 10×10 O/cm. The integrated intensity of the central peak increases with increasing initial oxygen content. For comparison, untreated samples of the same initial oxygen content do not reveal any anisotropic SAN scattering or a broadened central peak beam. [ABSTRACT FROM AUTHOR]

Published
1992
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