[en] The present work is concerned with the preparation of pure Beryllia concentrate from Zabara beryl mineralization in the mica schist of Wadi El Gemal area in the eastern desert. This has been possible through application of ion exchange techniques to selectively concentrate. This method is based on the fact that the beryllium complex of ethylene diamine tetra acetic acid (EDTA) at a ph of about 3.5, is much weaker than the corresponding complexes of iron and aluminum. It was, therefore, possible to effect a complete separation of beryllium from the latter on a cation exchange resin, the studied optimum conditions of separation include a contact time of 3 minute and ph of 3.5 for the selective separation of beryllium from its EDTA solution after a prior separation of alum

[en] The R and D activities of the Metallurgy Division of the Bhabha Atomic Research Centre, Bombay (India) during 1975 are described. Some of the R and D programmes of particular interest to nuclear technology are: (1) flowsheet development for the production of rare metals and alloys of nuclear use e.g. hafnium, beryllium, zirconium (2) metallurgical, irradiation hardening and corrosion studies on Zr and Zr-base alloys and (3) studies of nuclear ceramic materials such as UO2 and beryllia. (M.G.B.)

[en] It has been shown that a thermoluminescence (TL) peak of BeO cannot be fitted with a numerically generated glow peak involving only three trapping parameters, namely trap depth, frequency factor and order of kinetics. The peak can be fitted with a TL peak numerically generated by the exact solutions of the basic differential equations. This enables one to determine the five important intrinsic trapping parameters: trap depth, frequency factor, retrapping probability, recombination probability and the concentration of a disconnected trap, an impossible feat under the kinetics formalism. (author)

No abstract available

[en] Initial stage of 4.9 eV luminescence decay kinetics has been studied. All the properties discovered suggest that rapid luminescence in BeO should be logically related to luminescence of singlet ALE

[en] Kinetics of radiation induced adsorption of hydrogen on BeO under plasma action is considered. Equation describing of experimental results of dependence of adsorbed hydrogen quantity on BeO from prior sample preparation temperature and plasma action is found

[en] Published in summary form only

[en] A radiation dosimeter suitable for film badges works on the principle of radiation-induced thermally activated depolarization. The dosimeter contains a sample of dielectric material with (preferably) two electrodes. Before use, the apparatus is set by applying a voltage to the electrodes and heating the sample; it is then cooled to freeze in the bias polarization, and after removing the voltage, the terminals are (preferably) short-circuited to prevent the accumulation of static charge. After use for the prescribed period of exposure, the sample is heated while the flow of current between the terminals is recorded with a sensitive ammeter. In a modfication of the invention, the principle of radiation-induced thermally activated polarization (RITAP) is employed, in which case the voltage is applied to the sample during readout, not before exposure. Suitable dielectric materials include calcium fluoride, beryllium oxide, and alkaline earth phosphate minerals. A mixture of materials responsive to different forms of radiation may be used. (NDH)

[en] This specification defines the minimal physical and chemical characteristics of nuclear grade beryllium oxide (BeO) powder to be used in fabricating nuclear components

No abstract available