This title appears in the Scientific Report :
2015
Please use the identifier:
http://hdl.handle.net/2128/9088 in citations.
Influence of neutron moderating materials in the characterization of 200 L radioactive waste drums by neutron activation analysis
Influence of neutron moderating materials in the characterization of 200 L radioactive waste drums by neutron activation analysis
A prompt and delayed gamma neutron activation analysis facility using a 14 MeV neutron generator wasdeveloped at Forschungszentrum Jülich GmbH at a level of a prototype facility for the determination ofnonradioactive toxic and reactive elements in 200 L standard waste drums [1]. Analytical performan...
| Personal Name(s): | Mildenberger, Frank (Corresponding author) |
|---|---|
| Mauerhofer, Eric | |
| Contributing Institute: |
Nukleare Entsorgung; IEK-6 |
| Imprint: |
2015
|
| Conference: | 14th International Conference on Modern Trends in Activation Analysis, Delft (The Netherlands), 2015-08-23 - 2015-08-28 |
| Document Type: |
Conference Presentation |
| Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Nuclear Waste Management |
| Link: |
OpenAccess OpenAccess OpenAccess OpenAccess |
| Publikationsportal JuSER |
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| 100 | 1 | |a Mildenberger, Frank |0 P:(DE-Juel1)161327 |b 0 |e Corresponding author | |
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| 245 | |a Influence of neutron moderating materials in the characterization of 200 L radioactive waste drums by neutron activation analysis | ||
| 260 | |c 2015 | ||
| 520 | |a A prompt and delayed gamma neutron activation analysis facility using a 14 MeV neutron generator wasdeveloped at Forschungszentrum Jülich GmbH at a level of a prototype facility for the determination ofnonradioactive toxic and reactive elements in 200 L standard waste drums [1]. Analytical performance andsensitivity of this facility called MEDINA (Multi-Element Detection based on Instrumental Neutron Activation)were investigated for a 200 L steel drum filled with a concrete matrix [1,2] as concrete often is used asembedding material in waste conditioning. However the waste may also contain additional inhomogeneouslydistributed neutron moderating and absorbing materials and/or gamma shielding materials which hamper thereliability and accuracy of the analytical results.In this work, the influence of the presence of neutron moderating material in a concrete matrix on thedetermination of the waste matrix elemental composition is being investigated. Measurements were performedfor various axial and radial distributions of polyethylene and concrete bodies placed in 200 L steel drums. Theneutron generator was operated in a pulsed mode at a neutron emission of about 8·107 n·s-1. The neutron pulsewas set to 50 μs and the repetition period of the neutron pulses to 1 ms. The 14 MeV neutrons are moderated andreflected by the graphite walls of the irradiation chamber and thermalized by the sample as well. The gamma-rayspectra were acquired between the neutron pulses over a counting time of 940 μs after a waiting time of 10 μsafter end of the neutron pulses. The gamma-ray spectra were recorded for a total counting time of 3600 s. Thenet areas of the gamma-ray peaks for the isotopes of interest (1H, 10B, 12C, 28Si, 40Ca and 56Fe) are obtained bymanual analysis of the spectra using the Gamma-W spectroscopic software. The mean thermal neutron flux wasdetermined from the prompt gamma-rays of 56Fe induced by the activation of the steel drum [3]. The elementalcomposition of the PE/concrete matrix is calculated assuming that the drum is filled only with concrete. Thiscase would correspond to the real assay of inhomogeneous historical waste drums with no a priori knowledge ofthe content except the waste density. Discrepancies between measured and expected elemental concentration areevaluated and discussed involving MCNP5 simulations results.References[1] E. Mauerhofer, A. Havenith, The MEDINA facility for the assay of the chemotoxic inventory of radioactive waste packages, J.Radioanal. Nucl. Chem. (2014) 302:483-488[2] A. Havenith, Stoffliche Charakterisierung radioaktiver Abfallprodukte durch ein Multi-Element-Analyseverfahren basierend auf derinstrumentellen Neutronen-Aktivierungs-Analyse – MEDINA – Schriften des Forschungszentrum Jülich, Energie & Umwelt / Energy &Environment, Band/Volume 248, ISBN 978-3-95806-033-2[3] International Patent Application WO 2012/010162 A1; Australian Patent AU2011282018 | ||
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