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.
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.
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.
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.
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.
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.
The work defines and analyzes the resolution angle in image obtained by a directional detector. The effect of both the relative directivity diagram of the detector used and complexity of the scanned field are discussed.
Image of an infinite, monoenergetic radiation field, scanned by a directional detector is analyzed. The condition for ideally true image is discussed and the method for reconstruction of the directional flux densities of the radiation field, according to the data measured by a directional detector, are given.