[en] The present IAEA activities in radioactive waste management, components of the program and particular projects, the existing mechanism for information collection, analysis and distribution are outlined. The role of the IAEA as a forum for information exchange, for coordinating common efforts in waste technology development and as an international body for direct assistance of Member States is discussed. Current IAEA projects and recent achievements in related waste management areas are summarized and highlighted

[en] Equations are derived that connect the mass of a representative sample and such components of the total variance which characterize the dispersion of the results of neutron activation analysis (NAA), such as the variances of nonuniformity and replicate reproducibility. A method is proposed to estimate the minimum mass of a representative sample in the NAA of nonhomogeneous materials

[en] The applicability of a method to determine the gamma peak efficiency of gamma detectors was tested experimentally for point and Marinelli sources at various distances from the high-purity Ge detector. The method determines peak efficiency including self-absorption correction for a volume source consisting of any kind of matrix. The overall uncertainty achieved was 3 - 4%

[en] The values of volume activity and equivalent volume activity of radon, concentration of atmospheric ions, inner and outer temperature, pressure and air flow were measured in all Czech caves with the special emphasis to the speleocentres in Ostrov u Macochy and Zlate Hory. (author)

[en] An overview on the current state of knowledge of microbial actinide interaction processes is presented. Several detailed examples of the interaction of aerobic soil bacteria (Pseudomonas, Bacillus and Deinococcus strains) with uranium and plutonium are discussed. Details of the nature of the bacterial functional groups involved in the interfacial actinide interaction process are reported. Based on time-resolved laser-induced fluorescence spectroscopy (TRLFS) and synchrotron X-ray absorption spectroscopy (XANES and EXAFS) studies, molecular-level mechanistic details of the different interaction processes are discussed. Areas of this emerging field in actinide research are outlined where additional information and integrated interdisciplinary research is required

[en] The aim of this study is to examine in a normal subject various subfractions of leukocyte blood along with plasma, for their trace element concentration. This is in order to establish a reliable technique for separation and analysis which can be applied to the determination of elemental concentrations in leukocyte subfractions from patients undergoing heart by-pass surgery. Instrumental neutron activation analysis (INAA) analysis was the simultaneous, multielemental technique employed to determine the concentrations of elements. Results from these investigations are presented along with possibilities for further work

[en] The elemental contents of soil samples collected around a fertilizer plant in Romania within a pollution control study were investigated. An analytical method was developed based on the Energy Dispersive X-Ray Fluorescence (EDXRF) technique with a Ge(HP) detector and with radioactive excitation sources. To test the method, the observed concentrations of elements were compared with those obtained for the same material by Instrumental Neutron Activation Analysis (INAA). The detection limits for various elements are given for the two methods. Assets of the EDXRF method include its relatively low cost, simplicity and rapidity

[en] Experience gained during the last fifteen years in the determination of ²²⁶Ra in environmental samples is summarized. The different methods developed and/or employed for the determination of ²²⁶Ra in waters using either proportional counters or the liquid scintillation technique, as well as the methods used for its determination in soils, sediments and vegetation applying either gamma-ray spectrometry with semiconductor Ge-detectors or the alpha-particle spectrometry technique, are described, compared and assessed

[en] Radiolytic decomposition of water under the action of gamma rays in the presence of some zeolites such as ZSM-5, SAPO-5 and MOR was studied. The irradiation was performed using a gamma ⁶⁰Co source at an activity of 3^.10⁴ Ci and dose rate 8.3 KGy/h. The stable products of radiolysis as well as the other chemical species were identified by mass spectrometry. The calculated radiochemical yield decreased in order: H-ZSM-5 > Na-ZSM-5 > H-SAPO-5 > MOR and was higher in the presence of these catalysts than in their absence

[en] The cyclotron may be used as an important source of radionuclides. Some of those radionuclides may serve for the production of radiopharmaceuticals. Basic information is given relating to various aspects of those compounds. The conditions of distribution, delivery and administration of the radiopharmaceuticals - their indication and use are discussed. Several examples of the importance of logistics are also presented. In addition to the general information on radiopharmaceuticals, the most important cyclotron-produced radionuclides for the purpose of production of radiopharmaceuticals, along with their methods of manufacturing, are listed. The following aspects of the production are dealt with: target technique, technology of radionuclide production, carrier labelling, special conditions of the production, analytical aspects and problems of a timely delivery. Special attention is paid to a most prospective part of radiopharmaceuticals - PET products, their physical principle and logistic aspects