[en] Effect of g-irradiation on storage time of tomatoes was studied and tomatoes of Diego variety in three different stages of ripening were used for the experiment. Green-mature tomatoes were treated with 100 and 200 krad, pink (half-mature) tomatoes were treated with 50, 100, 200, 300, 400 and 500 krad doses of gamma rays respectively. After irradiation the tomatoes were stored in a room where the temperature was kept at 22 C with a humidity of 65%. During storage period color changes, softening, spoilage and molding of the fruits were controlled daily, weight loss measurements and all necessary chemical analysis were made periodically. (author)

No abstract available

[en] A survey is presented of the important damage-producing interactions in semiconductor detectors and estimates of defect numbers are made for MeV protons, neutrons and electrons. Damage effects of fast neutrons in germanium gamma ray spectrometers are given in some detail. General effects in silicon detectors are discussed and damage constants and their relationship to leakage current is introduced

[en] An ionizing radiation dosemeter for operation in accelerators and reactor cores is described. A sensitive element of the dosemeter is made as a monocrystal plate with a coating film on it. The film is made of the material with the coefficients of radiation change in density and elasticity modulus differing from these characteristics for a monocrystal. The sensitive element is being bent under radiation effect and bending is measured by means of a pointer and scale calibrated in units of absorbed doses. The sensitive element of the dosemeter suggested can be made of the following pairs of materials: BeO-Al₂O₃; BeO-CaAs; SiO₂-Si. Application of the dosemeter provides: increase of the range of the ionizing radiation absorbed doses measured upto 10¹² rad; measurement of the absorbed doses for different types of ionizing radiation; simplicity of construction, performance and operation

[en] At scattering of relativistic bunches of charged particles the effect of a significant amplification of radiation in the region of low radiated frequencies, when the spectral density is proportional to the square number of particles in the bunch, is possible. This effect holds both for head-scattered bunches, and bunches which scattered at a small angle between their axes of motion. At the same time with an increasing number of the particles in bunches the radiation is almost independent of the number of particles. The analogy of these effects and the effects of radiation at the passage of charged particles in matter is discussed. The analogy of the mechanisms of these radiation processes not only for coherent, but also for incoherent radiation, is shown. The possibility of usage of the coherent effect in radiation for monitoring charged particle beams is noted.

[en] The search for radiation resistant plastic scintillators has recently resumed at many institutions. The paper presents new experimental data on the radiation resistance of plastic scintillators and proposes ways of increasing it above 10 Mrad

[en] The objectives of the School were twofold. Firstly to inform participants of actual and developing technological applications of glassy materials in which fundamental science makes a strong contribution, and secondly to bring together scientists from the widely different backgrounds of glass science and technology to promote mutual understanding and collaboration. (orig.)

[en] Process for preventing the modification of a polymer whose molecule contains a halogen, under the effect of an ionizing radiation, consisting in adding to this polymer a heat stabilizing metal-based agent, and a mercaptan, characterized in that hydroquinone is also added

[en] Using the methods of X-ray diffraction, metallographical and weight analysis, changes in the structure of polycrystal aluminium oxide after annealing in the range of temperatures 1888-2000 deg C and irradiation by xenon ions in the doses of up to 2.7 x 1017 cm^-2 at the energy of up to 300 keV have been investigated. It is ascertained that radiation effect spreads to the depths, which exceed by a factor of 104 the thickness of amorpherized ion-doped layer. (author)

[en] Specimens of sintered UO₂, a high melting point ceramic with the fluorite structure, were irradiated with heavy ions (¹²⁹Xe, ²³⁸U) with different fluences (5 x 10¹⁰ to 7 x 10¹³ ions/cm²) and energies (173 MeV for Xe ions to 2.713 GeV for U ions). The influence of the electronic energy loss on the mechanisms of damage formation was studied in the range of 29 to 60 keV/nm. Transmission Electron Microscopy (TEM) was performed to identify and characterize the damage induced by these ions. Tracks produced by U ions of 2713 and 1300 MeV and by Xe ions of 173 MeV were observed. The radii of the observed tracks were calculated using a thermal-spike model, taking into account the thermodynamic parameters of the material and the energy and velocity of the incoming ions. The TRIM code was used to determine the displacement profile and the energy distribution along the ion paths. Good agreement with the experimental results was found. The dependence of damage formation on the ion dose was also studied. For instance, defect clusters and loops were produced in UO₂ irradiated with ¹²⁹Xe of 173 MeV (dE/dx∝29 keV/nm) between 7 x 10¹⁰ and 7 x 10¹³ ions/cm². (orig.)