Search results for: Krzysztof Drozdowicz

Items from 1 to 12 out of 12 results

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Detection of Delayed Neutrons from Fissionable Samples: Monte Carlo Modelling and Physical Assumptions for a Design of the DET-12 Device

Arkadiusz Kurowski, Barbara Bieńkowska, Krzysztof Drozdowicz, Barbara Gabańska, more

Journal of Fusion Energy > 2018 > 37 > 2-3 > 120-123

An activation of fissionable materials with neutrons has been considered as a possible neutron diagnostic of D–D and D–T fusion plasma. Fission reaction caused by fusion neutrons leads up to emission of secondary neutrons: prompt and delayed. Physical assumptions have been outlined to design a new device (DET-12) for measurements of delayed neutrons emitted from samples of fissionable materials activated...

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Monte Carlo tools evaluation for nuclear analyses of the European DEMO

Jean-Charles Jaboulay, Frédéric Damian, Giacomo Aiello, David Taylor, more

Fusion Engineering and Design > 2015 > 98-99 > C > 1800-1803

This paper presents the status of different Monte Carlo (MC) particle transport codes regarding their capabilities to model the European fusion power demonstration reactor (DEMO). This work was carried out, via a collaboration between CEA, CCFE, IPPLM and KIT to evaluate MC codes which could replace MCNP for nuclear analysis on DEMO. Each association has participated using a different MC code: CEA...

article

Konsekwencje zniesienia obowiązku meldunkowego dla postępowania cywilnego. Podstawowe problemy i kierunki ich rozwiązania

Krzysztof Drozdowicz

Studia Prawnicze > 2014 > 2 (198) > 143-158

This article is about the effects of abolition of the compulsory registration and some other records in civil proceedings. Replacement of the existing law on the population register and identity cards by two bills which refer to this issue carries the risk of difficulties in the effective search those people who take an active part in civil proceedings. This applies both to the defendants as well...

article

Consequences of the abolition of compulsory registration for civil proceedings. Essential issues and directions of solution

Krzysztof Drozdowicz

Studia Prawnicze > 2014 > 2 (198) > 143-157

article

Pulsed thermal neutron source at the fast neutron generator

Grzegorz Tracz, Krzysztof Drozdowicz, Barbara Gabańska, Ewa Krynicka

Applied Radiation and Isotopes > 2009 > 67 > 6 > 1148-1155

A small pulsed thermal neutron source has been designed based on results of the MCNP simulations of the thermalization of 14MeV neutrons in a cluster-moderator which consists of small moderating cells decoupled by an absorber. Optimum dimensions of the single cell and of the whole cluster have been selected, considering the thermal neutron intensity and the short decay time of the thermal neutron...

article

Diffusion cooling of thermal neutrons in the outer Plexiglas layer of a two-zone system with non-hydrogenous material inside

Krzysztof Drozdowicz, Urszula Wiącek, Ewa Krynicka, Barbara Gabańska, more

Annals of Nuclear Energy > 2008 > 35 > 8 > 1403-1413

Diffusion cooling of thermal neutron flux in a finite volume of a medium results from the leakage of neutrons. The cooling effect is particularly complex when the system consists of zones with different neutron scattering properties. A study is presented on the diffusion cooling in Plexiglas (hydrogenous material), which constitutes an outer cylindrical shell surrounding an inner cylinder made of...

article

Monte Carlo simulations of the pulsed thermal neutron flux in two-zone systems with Plexiglas – Using the MCNP code with a modified hydrogen-data library

Ewa Krynicka, Urszula Wiącek, Krzysztof Drozdowicz, Barbara Gabańska, more

Nuclear Inst. and Methods in Physics Research, B > 2006 > 251 > 1 > 19-26

A comparison of real and Monte Carlo simulated pulsed neutron experiments in two-zone cylindrical systems is presented. Such geometry is met when a neutron moderator surrounds a sample of the investigated material. In this study, a Plexiglas shell (hydrogenous medium) surrounds the inner zone filled with a non-hydrogenous medium: copper oxide or chrome oxide. The time decay constant of the thermal...

article

Influence of granulation of the sample on the thermal neutron Σ _a measurement

Krzysztof Drozdowicz, Barbara Gabańska, Andrzej Igielski, Ewa Krynicka, more

Nuclear Inst. and Methods in Physics Research, B > 2004 > 213 > Complete > 42-48

The theoretical approach to the influence of granulation of samples on the measured thermal neutron absorption cross-section has been verified in an experiment on samples containing irregular grains. The neutron absorption heterogeneity effect is defined as the ratio G of the absorption cross-section of the grained sample to the cross-section of the corresponding homogenised medium. The parameter...

article

The effective absorption cross-section of thermal neutrons in a medium containing strongly or weakly absorbing centres

Krzysztof Drozdowicz, Barbara Gabańska, Andrzej Igielski, Ewa Krynicka, more

Open Physics > 2003 > 1 > 2 > 210-234

The structure of a heterogeneous system influences diffusion of thermal neutrons. The thermal-neutron absorption in grained media is considered in the paper. A simple theory is presented for a two-component medium treated as grains embedded in the matrix or as a system built of two types of grains (of strongly differing absorption cross-sections). A grain parameter is defined as the ratio of the effective...

article

The effective absorption cross-section of thermal neutrons in a medium containing strongly or weakly absorbing centres

Krzysztof Drozdowicz, Barbara Gabańska, Andrzej Igielski, Ewa Krynicka, more

Open Physics > 2003 > 1 > 2 > 210-234

article

A generalized interpretation of buckling experiments for thermal neutrons

Urszula Woźnicka, Krzysztof Drozdowicz, Joanna Dabrowska

Nuclear Inst. and Methods in Physics Research, A > 2000 > 455 > 3 > 660-669

The buckling experiment is a well-known pulsed measurement method used to determine the thermal neutron diffusion parameters of a medium. In the classic form of the method, a dependence between the geometric buckling B ² (in cm ^- ² ) and the thermal neutron time decay constant λ (in s ^- ¹ ) are involved. In the present paper, dimensionless values for the decay constant...

article

A method to calculate thermal neutron diffusion parameters for hydrogenous mixtures

Krzysztof Drozdowicz

Nuclear Inst. and Methods in Physics Research, A > 1998 > 411 > 1 > 121-129

A comprehensive method is proposed to calculate the thermal neutron diffusion parameters for homogeneous mixtures of any non-multiplying non-crystalline compounds, in particular including hydrogenous substances. The macroscopic absorption, scattering, and transport cross sections of the mixture are defined generally as functions of the incident neutron energy. The energy-averaged neutron parameters...

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