From international conference on bone mineral measurement; Chicago, Illinois, USA (12 Oct 1973). Abstracts of papers presented at the international conference on bone mineral measurement are presented. The papers were grouped into two sessions: a physical session including papers on measuring techniques, errors, interpretation and correlations, dual photon techniques, and data handling and exchange; a biomedical session including papers on bone disease, osteoporosis, normative data, non-disease influences, renal, and activity and inactivity. (ERB)

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Currently a Ge(Li) spectrometer is being employed for in-situ measurements of radionuclides contained in soil. This is being done at nuclear reactor sites and in complex radionuclide fields at the Nevada Test Site. The methodology and precision of the in-situ spectrometric technique was previously established for analysis of radionuclides in soil. Application of the technique to gaseous and liquid effluents containing radionuclides has shown a great deal of promise. (auth)

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From thermal power conference; Pullman, Washington, USA (3 Oct 1973). The possibility of developing dynamic conversion machines for topping cycles --- expanders and turbines ---that might utilize refractory materials not previously applied to this purpose is investigated. A technological basis for topping cycle systems that will extend the conversion efficiency of central power stations to the range of 55 to 60% is provided. The performance of a small (500 cm/sup 3/ displacement) graphite helical rotor compressor-expander set operating on inert gas for nearly 300 hr at temperatures up to 1500 deg C and rotor speeds to 14,000 rpm is described. In a related program, turbine blades and sound monolithic bodies up to 36 in. characteristic dimension were fabricated of the refractory compounds silicon nitride (Si/sub 3/N/sub 4/) and silicon carbide (SiC), which are compatible with air and combustion products. The application of available materials and power-conversion technology to permit a significant improvement in energy conversion efficiency is discussed. The demonstration of this capability is proposed by devising topping cycle systems incorporating ceramic engines capable of extracting useful energy from combustion heat sources at conditions presently inaccessible. 12 references. (auth)

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Cost-benefit analysis indicates that it would be prudent policy to require the prevention of /sup 85/Kr release from fuel reprocessing plants at the present time, assuming this can be accomplished at a cost amounting to less than 00/Ci. Options are discussed for accomplishment of /sup 85/Kr release prevention from fuel reprocessing plants. No value judgments have been attempted in evaluating these options. However, it has been assumed that a policy of concentrating effluent noble gases, retaining them in pressurized storage tanks, and storing them for long periods at some centralized facility will be adopted. Such a policy would appear to be consistent with current AEC policy on high-level waste management. Criteria for siting a long-term noble gas storage facility should include assurance that in the event of a containment failure: (a) maximum permissible dose guidelines (0.5 rem/yr for whole body and 3.0 rem/yr for skin) are not exceeded, and (b) resultant population doses (man-rem) are minimized. Five hypothetical sites have been evaluated to estimate population doses in the event of leakage. From this analysis it appears that geographic siting may be considered relatively unimportant. Site selection should be based on cost- benefit studies considering: (a) transportation and handling costs, (b) …

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From conference on structure-property relationships in thick film and bulk coatings; San Francisco, California, USA (28 Jan The development of CVD techniques for fabricating free-standing tungsten and tungsten - rhenium alloy structures is reviewed. Relationships between plating parameters, kinetics, morphology, microstructure, and properties of thick polycrystalline deposits are discussed. It is emphasized that porosity may be grown into the grain boundaries when the deposition rate is cortrolled by gas phase diffusion, and that fully dense deposits are generally obtained when the rate is limited by a surface process. The origin and control of many of the microstructural features peculiar to CVD are also discussed. (11 figures) (auth)

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