| Description
| - The VR-1 training reactor of the Department of Nuclear Reactors of CTU in Prague is a light water swimming pool-type reactor with thermal power of 1 kWt. The reactor uses the IRT-4M-type concentric fuel moderately enriched to 19.7 % 235U. Since 1990, the reactor has served mostly to train students; the possibility to use the reactor for scientific purpose has been tested recently. It is equipped with several vertical and two horizontal channels that allow to study the neutron field and to irradiate samples. In present work, the feasibility of one of horizontal channels for irradiation application of materials and for nuclear data and calculation codes validation was successfully tested. The neutron multi-foil activation method was used to determine the neutron field parameters in the horizontal radial channel, namely the reaction rates, energy spectral indexes, and neutron spectrum. In the first experimental period, fourteen variable types of activation and threshold detectors (NaCl, Al, Sc, Mn, Fe, Ni, Cu, Mo, In, Lu, W, Au, Th, U) both uncovered and cadmium covered were irradiated to measure the reaction rates and energy spectral indexes both lengthwise and crosswise the experimental channel. Irradiated foils were processed by using the semiconductor gamma-spectroscopy. From the course of spectral indexes lengthwise the channel follows that the epithermal neutrons quantity decreases due to moderating effects of channel walls; according to the course of spectral indexes crosswise the channel, the epithermal neutrons quantity increases due to a higher number of moderated thermal neutrons coming from a biological shielding of the channel. In the second experimental period, the set of ten activation foils (Fe, Mn, Cu, Mo, Au, Sc, Dy, In, Ti, Ta) was used to determine the neutron field in horizontal channel by using the neutron activation method together with the HPGe semiconductor and NaI(Tl) scintillation gamma spectroscopy technique. To unfold the neutron spectrum
- The VR-1 training reactor of the Department of Nuclear Reactors of CTU in Prague is a light water swimming pool-type reactor with thermal power of 1 kWt. The reactor uses the IRT-4M-type concentric fuel moderately enriched to 19.7 % 235U. Since 1990, the reactor has served mostly to train students; the possibility to use the reactor for scientific purpose has been tested recently. It is equipped with several vertical and two horizontal channels that allow to study the neutron field and to irradiate samples. In present work, the feasibility of one of horizontal channels for irradiation application of materials and for nuclear data and calculation codes validation was successfully tested. The neutron multi-foil activation method was used to determine the neutron field parameters in the horizontal radial channel, namely the reaction rates, energy spectral indexes, and neutron spectrum. In the first experimental period, fourteen variable types of activation and threshold detectors (NaCl, Al, Sc, Mn, Fe, Ni, Cu, Mo, In, Lu, W, Au, Th, U) both uncovered and cadmium covered were irradiated to measure the reaction rates and energy spectral indexes both lengthwise and crosswise the experimental channel. Irradiated foils were processed by using the semiconductor gamma-spectroscopy. From the course of spectral indexes lengthwise the channel follows that the epithermal neutrons quantity decreases due to moderating effects of channel walls; according to the course of spectral indexes crosswise the channel, the epithermal neutrons quantity increases due to a higher number of moderated thermal neutrons coming from a biological shielding of the channel. In the second experimental period, the set of ten activation foils (Fe, Mn, Cu, Mo, Au, Sc, Dy, In, Ti, Ta) was used to determine the neutron field in horizontal channel by using the neutron activation method together with the HPGe semiconductor and NaI(Tl) scintillation gamma spectroscopy technique. To unfold the neutron spectrum (en)
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