[en] Thermal neutron fluxes in the vicinity of a simulated Intense Neutron Generator target have been measured using Mn and Au foils, and a small BF₃ detector. The target was a Pb cylinder either 4-inch or 8-inch in diameter with a 1.2 g Ra-Be neutron source at its centre. This was centrally mounted in a 5' diam. x 5' high tank which was filled with either H₂O or D₂O moderator. Various gaps and absorbing annuli were placed around the target, and air-filled aluminum 'beam tubes' were mounted radially or tangentially from the target to simulate typical ING conditions. The measured thermal neutron fluxes were less than calculated at all radii. The single-age computation clearly gives large errors at large radii, but the multi-energy approach seems to give a useful indication of the thermal flux distribution in spite of the extreme simplicity of the model. The fall in measured fluxes at small radii in both D₂O and H₂O is most likely caused by absorption in the target material which is not allowed for in the computational model. (author)

[en] This manual provides clinical interpretations of diagnostic imaging studies. It includes selected photographs and diagrams to illustrate major points presented in the text, and outline agents, procedures, physiology, pathophysiology, and clinical interpretation of diagnostic imaging studies

[en] A high velocity lithium droplet cloud traversing the magnetic field of a fusion reactor may be useful for collecting plasma ions and their energy. In this report, the forces associated with such motion in nonuniform magnetic fields are derived

[en] Several calculational procedures are compared for predicting cleavage arrest of a deep crack in the wall of a prototypical reactor pressure vessel (RPV) subjected to pressurized-thermal-shock (PTS) types of loading conditions. Three procedures examined in this study utilized the following models: (1) a static finite-element model (full bending); (2) a radially constrained static model; and (3) a thermoelastic dynamic finite-element model. A PTS transient loading condition was selected that produced a deep arrest of an axially-oriented initially shallow crack according to calculational results obtained from the static (full-bending) model. Results from the two static models were compared with those generated from the detailed thermoelastic dynamic finite-element analysis. The dynamic analyses modeled cleavage-crack propagation using node-release technique and an application-mode methodology based on dynamic fracture toughness curves generated from measured data. Comparisons presented here indicate that the degree to which dynamic solutions can be approximated by static models is highly dependent on several factors, including the material dynamic fracture curves and the propensity for cleavage reinitiation of the arrested crack under PTS loading conditions. Additional work is required to develop and validate a satisfactory dynamic fracture toughness model applicable to postcleavage arrest conditions in an RPV

[en] Particular aspects of the problems were illustrated by reference to diagrams, as follows: the critical situation of oil and natural gas as shown by block diagrams of world reserves and estimated consumption over the period 1973 to 1998; the UK fuel consumption 1950 to 1975, showing how oil and natural gas have grown in importance in relation to coal; the primary fuels and their uses in the UK in 1973 (showing proportions used in various ways, and proportion lost as rejected heat); and a forecast of UK primary energy sources up to 1990. Nuclear energy and other possible replacements for the primary fuels are considered. (U.K.)

[en] Applications of the neutron are considered to show how its properties make it a valuable engineering tool. They include nuclear safeguards, static and dynamic radiography, small angle scattering, neutron gauges, the transmutation doping of silicon, and the production and use of radioactivity in activation analysis and for industrial tracers. (author)

[en] Having outlined the principles of nuclear safeguards, some application of neutrons in engineering and technology are described including: the use of neutron activation analysis for on-stream analysis in the coal industry and for forensic applications, fission track detection of uranium, neutron sondes for oil and mineral exploration, tracer applications, transmutation doping of silicon, nuclear track filter production, neutron scattering studies of materials, neutron radiography, dynamic radiography, tomography and holography. (U.K.)

[en] Minimal supersymmetric SU(5) GUTs are being squeezed by the recent values of α_s, sin²θ_W, the lower limit on the lifetime for p→ν-bar K decay, and other experimental data. We show how the minimal flipped SU(5) GUT survives these perils, accommodating the experimental values of α_s and sin²θ_W and other constraints, while yielding a p→e/μ⁺π⁰ lifetime beyond the present experimental limit but potentially accessible to a further round of experiments. We exemplify our analysis using a set of benchmark supersymmetric scenarios proposed recently in a constrained MSSM framework

[en] Neutron radiography is a small, highly specialized field. Many countries have only one group or one individual working in the field. Their work is often unique. International communication is therefore of much importance. The objective of this paper is to provide the international audience at the Eleventh World Conference on Nondestructive Testing with a summary analysis of neutron radiography trends world wide, to survey briefly what it can do, and what opportunities are available for implementation

No abstract available