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[en] The results of investigation of photon transport through the subwavelength hole in the opaque screen by using single neutral atom are represented. The basis of the proposed and implemented method is the absorption of a photon by a neutral atom immediately before the subwavelength aperture, traveling of the atoms through the hole and emission of a photon on the other side of the screen. Realized method is the alternative approach to existing for photon transport through a subwavelength aperture: 1) self-sustained transmittance of a photon through the aperture according to the Bethe’s model; 2) extra ordinary transmission because of surface-plasmon excitation.
[en] In the use of nuclear techniques, one of the safety problems is the protection of personnel and delicate instruments against harmful radiation. It is therefore of prime importance that the designer of nuclear experiments have a basic understanding of how radiation behaves when it passes through matter. This is a tutorial paper that presents the fundamentals of electromagnetic radiation with respect to its interaction and absorption in matter. (author)
[en] The localization and transport of a photon through a subwavelength hole with the help of a neutral atom are studied. A method proposed and realized in the study is based on the absorption of a photon by a neutral atom directly in front of a subwavelength hole, the flight of the atom through the hole, and photon emission on the other side of the screen. The influence of the interaction of the excited atom flying through the subwavelength channel with the screen material is estimated. The estimate showed that the atomic excitation can be quenched in holes with diameters smaller than 200 nm, which affects the photon transport efficiency.
[en] Ce3+ doped and B3+ co-doped gadolinium gallium aluminum garnet (Gd3Ga3Al2O12:Ce,B or GGAG:Ce,B) single crystal is a relatively new scintillator material with several attractive properties, aiding its use in gamma spectrometry in conjuncture with silicon photodiodes. The present study aims at the modeling of the crystal by incorporating accurate physical, scintillation, optical and surface properties, in order to carry out GEANT4 based Monte Carlo simulation that includes radiation transport as well as optical photon generation and transport, leading to the generation of a pulse-height spectrum. Pulse-height spectra generated by simulations are presented and compared for different sizes of the crystal
[en] We introduce a new treatment of the difference formulation for photon radiation transport without scattering in 1d slab geometry that is closely analogous to that of Fleck and Cummings for the traditional formulation. The resulting form is free of implicit source terms and has the familiar effective scattering of the field of transport
[en] The ANISLAB code is a modified version of the ANISN Code used for the solution of neutron, gamma transport problems through any collection of plane shields made of various materials. The incident flux is assumed to be monodirectional. This code is coupled with a photon-electron code which makes possible to compute at the boundaries of the shielding assembly the electron currents. One also obtains the energy deposit by electrons inside shields