Search Results

You are looking at 1 - 10 of 17 items for

  • Author or Editor: I. Petr x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

Two characteristics, the detection crosssection and efficiency of the detector in a radiation field are discussed. Two particular forms of the radiation field, namely the monodirectional and isotropic, were also considered. The characteristic values for two scintillators in a photon beam and photon isotropic field are presented for illustration.

Restricted access

Abstract  

Some rarely used detector characteristics which characterize the directional properties of a detector are introduced in the paper. Attention is particularly paid to relative and absolute directiveities of a detector and their connection to other important detector characteristics.

Restricted access

Abstract  

The pape analyses the energy deposition of secondary electrons in SiO2. The energy deposition is shortly described for recoil electrons with energy from 10 eV. The mangitude of energy required for production of one electron-hole pair and the value of corresponding mean free path are presented.

Restricted access

Abstract  

The density of surface states at Si–SiO2 interface is examined for dry and wet oxidization process on 111 silicon substrate. The trivalent silicon centers are probably responsible for thermal and radiation generated surface states at the Si–SiO2 interface. The dependence of the radiation induced surface state density is compared for various oxide thicknesses and oxidization methods used.

Restricted access

Abstract  

The paper deals with the characteristics of the radiation field, namely the flux density and current density. Two transformations of the general radiation field are presented which could considerably simplify the calculations in several situations.

Restricted access

Abstract  

The usefulness and principle of a combined scintillation detector with a flat diagram of the directional sensitivity is described. The directional properties are illustrated on a slab-type detector consisting of a NaI/T1/ and plastic scintillators.

Restricted access

Abstract  

Backward approximating method for the reconstruction of an infinite, monoenergetic radiation field, scanned by a directional detector is presented. The described method is probably the simplest among other reconstruction methods, nevertheless it often leads to quick and reasonable results.

Restricted access

Abstract  

The application of the parameter estimation method for the reconstruction of the directional flux density from the data obtained by a directional detector is presented in the paper.

Restricted access

Abstract  

Discretization method for unfolding Fredholm equation of the first kind is suggested for the reconstruction of an infinite monoenergetic radiation field scanned by a directional detector. The method is readily applicable for scanning carried out in planes with constant radial angles.

Restricted access

Abstract  

Regularization method in the reconstruction of an infinite monoenergetic radiation field scanned by a directional detector is considered in the paper. A comparison of the reconstructions with an without regularization is given and the principles for using the regularization method are presented.

Restricted access