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Cross section measurement in reactor spectrum: 55Mn(n,2n), 90Zr(n,2n), 127I(n,2n)
Burianová, Nicola ; Košťál, Michal (advisor) ; Krtička, Milan (referee)
This diploma thesis deals with the validation of spectral average cross-sections (SACS) of 55 Mn(n,2n)54 Mn, 90 Zr(n,2n)89 Zr, 127 I(n,2n)126 I reactions in well-defined LR-0 reactor spectrum. The measurement of SACS for selected reactions is of high interest because they are used for the practical reactor dosimetry. Various experiments for description of neutron field in reactor and detector characterization, which are necessary for validation, are described. The spectral average cross-sections are derived from Net Peak Areas of irradiated samples measured using a semiconductor high purity germanium detector. Obtained result were compared with MCNP6 calculations using ENDF/B-VII.0, ENDF/B-VII.1, JEFF-3.1, JEFF-3.2, JENDL-3.3, JENDL-4, ROSFOND-2010, CENDL-3.1 and IRDFF nuclear data libraries. Notable discrepancies were found in 90 Zr(n,2n)89 Zr and 127 I(n,2n)126 I reactions. This thesis also contains a theoretical basis for the interaction of neutrons with matter.
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Cross section measurement in reactor spectrum: 55Mn(n,2n), 90Zr(n,2n), 127I(n,2n)
Burianová, Nicola ; Košťál, Michal (advisor) ; Krtička, Milan (referee)
This diploma thesis deals with the validation of spectral average cross-sections (SACS) of 55 Mn(n,2n)54 Mn, 90 Zr(n,2n)89 Zr, 127 I(n,2n)126 I reactions in well-defined LR-0 reactor spectrum. The measurement of SACS for selected reactions is of high interest because they are used for the practical reactor dosimetry. Various experiments for description of neutron field in reactor and detector characterization, which are necessary for validation, are described. The spectral average cross-sections are derived from Net Peak Areas of irradiated samples measured using a semiconductor high purity germanium detector. Obtained result were compared with MCNP6 calculations using ENDF/B-VII.0, ENDF/B-VII.1, JEFF-3.1, JEFF-3.2, JENDL-3.3, JENDL-4, ROSFOND-2010, CENDL-3.1 and IRDFF nuclear data libraries. Notable discrepancies were found in 90 Zr(n,2n)89 Zr and 127 I(n,2n)126 I reactions. This thesis also contains a theoretical basis for the interaction of neutrons with matter.
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Gamma-spectrometry in reactor physics at LR-0 Rez experimental reactor
Burianová, Nicola ; Švadlenková, Marie (advisor) ; Krtička, Milan (referee)
The first part of this bachelor's thesis deals with the basics of the semiconductor gamma-ray spectrometry theory that is used at experimental reactor LR-0 in Research center in Řež. The measurement results are applied in reactor physics. The second part describes the measurement of a fuel pin, which was performed in order to determine gamma permeability of lead shielding of the semiconductor detector for specific type of colimator. Experimental results are compared with those calculated at the LR-0 using MCNP method.
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