The LVR-15 reactor is a 10-MW research reactor mostly dedicated to material research and isotope production. Material testing can be performed in various irradiation loops and rigs. For specimen irradiation, several rig constructions can be used, including standard single-cell CHOUCA rigs or special dedicated multi-cell rigs. The temperature in the rigs is controlled by a temperature control system, which can be operated in a stable or pulsed mode, with regard to the rig design. Irradiation conditions in the rig are monitored by a set of various fluence detectors. From these detectors, neutron fluence and its energy distribution can be determined for the whole volume of irradiation samples. Besides measurement, irradiation conditions are calculated by the Monte Carlo code MCNPX, which provides a complete review of irradiation conditions including neutron fluence and its energy distribution in samples and detectors, radiation damage and radiation heating conditions for the rig. A set of experimental and theoretical characteristics for dedicated irradiation positions in the core reflector and in fuel will be provided.
Since 2010 the LVR-15 reactor has been gradually converted from highly enriched fuel (36wt% (235)U) to low enriched fuel with the enrichment of 19.75wt% (235)U. Paper presents influence of the core pattern changes on the neutron characteristics of the epithermal beam. The determination of neutron spectrum free in the beam was done with a set of neutron activation monitors. After the reactor conversion the change in neutron spectrum is not provable as differences are in the range of measurement errors.
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- analýza selhání vybavení MeSH
- atomové reaktory přístrojové vybavení MeSH
- design vybavení MeSH
- neutrony * MeSH
- radiometrie přístrojové vybavení MeSH
- terapie metodou neutronového záchytu (bor-10) přístrojové vybavení MeSH
- uran analýza MeSH
- Publikační typ
- časopisecké články MeSH
- hodnotící studie MeSH
- práce podpořená grantem MeSH
- srovnávací studie MeSH
The characterization of the epithermal beam is performed by different dosimetry techniques that give information on neutron flux as well as neutron and photon doses. One of the possible methods is based on the measurement of thermal neutrons in a moderation environment, which enables the evaluation of neutron flux in a group structure and also neutron dose. The advantage of such a spectrometer consists of the fact that 90% response intervals of the spheres continuously cover the epithermal part of the neutron energy range. The method has been applied to characterize the epithermal neutron beams at several research centers in USA, Finland, the Netherlands and Czech Republic. The comparison of the MIT FCB, HFR HB11, VTT FiR, and LVR-15 beam parameters is presented in this paper.
Horizontal channel with epithermal neutron beam at the LVR-15 research reactor is used mainly for boron neutron capture therapy. Neutron fluence depth profiles in a water phantom characterise beam properties. The neutron fluence (approximated by reaction rates) depth profiles were measured with six different types of activation detectors. The profiles were determined for thermal, epithermal and fast neutrons.
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- atomové reaktory MeSH
- chemické modely MeSH
- neutrony MeSH
- počítačová simulace MeSH
- radiační rozptyl MeSH
- voda chemie MeSH
- Publikační typ
- časopisecké články MeSH
- MeSH
- kvalita zdravotní péče normy využití MeSH
- řízení kvality MeSH
- sociální péče MeSH
- sociální práce metody normy pracovní síly MeSH
- Publikační typ
- biografie MeSH
- rozhovory MeSH
- O autorovi
- Keprt, Václav Autorita
- MeSH
- poskytování zdravotní péče organizace a řízení MeSH
- řízení kvality MeSH
- sociální péče MeSH
- Publikační typ
- rozhovory MeSH
