[en] The Health Physics Research Reactor is a small pulse reactor at the Oak Ridge National Laboratory. It is desirable for the operator to be able to demonstrate on a routine basis that all the fuel pieces are present in the reactor core. Accordingly, a technique has been devised wherein the control rod readings are recorded with the reactor at delayed critical and corrections are made to compensate for the effects of variations in reactor height above the floor, reactor power, core temperature, and the presence of any massive neutron reflectors. The operator then compares these readings with the values expected based on previous operating experience. If this routine operational check suggests that the core fuel loading might be deficient, a more rigorous follow-up may be made

[en] During the period of LEP running, the precision of determinations of the strong coupling, α_s(M_z), has improved from ∼ 10% to ∼ 2 - 3%. The contribution made by measurements of α_s using the data recorded at LEP, together with progress in theoretical calculations, is reviewed. Consistent results are obtained using a variety of different techniques

[en] The use of first detection apparatus responsive to a first emission of a hazardous nature (e.g. radio-active or ionising radiations), toxic or nerve gases is taught by training in the use of a second detection apparatus responsive to a second emission of a non-hazardous nature (e.g. a relatively harmless gas). The harmless gas may be given off by a self-contained movable carrier which may comprise activated carbon, or silica gel, or a molecular sieve, and may take the form of a simulated nut or bolt, or a particulate material, or a simulated pebble or stone, or a grease. The gaseous material may comprise ethylene, or butane, or a chlorinated hydrocarbon, e.g. chloroform. A detector of the harmless gas may comprise an explosive atmosphere detector, or a sensitive gas leak detector, or a specific gas monitor, or an electron capture detector and may be calibrated in units of the hazardous emission. (author)

[en] A composite radiation dosimeter detector element is described. It comprises a polyethersulphone matrix in which are incorporated particles of a thermoluminescent phosphor, e.g. lithium fluoride, the matrix being formed as a layer (preferably as a thin film) on and bonded to or very strongly adhered to the surface of a backing layer (preferably a thin film of metal) which is thermally conductive and substantially thermally and mechanically stable at working temperature. (author)

[en] The mechanisms that are operated to control the reactivity of the Tower Shielding Reactor II(TSR-II) are mounted on a Control Mechanism Housing (CMH) that is centered inside the reactor core. The information required to procure, fabricate, inspect, and assemble a CMH is contained in the ORNL engineering drawings listed in the appropriate sections. The components are fabricated and inspected from these drawings in accordance with a Quality Assurance Plan and a Manufacturing Plan. The material in this report describes the acceptance and performance tests of CMH subassemblies used ty the Tower Shielding Facility (TSF) staff but it can also be used by personnel fabricating the components. This information which was developed and used before the advent of the formalized QA Program and Manufacturing Plans evolved during the fabrication and testing of the first five CMHs

No abstract available

[en] In March 1985 the CERN Spanti-pS collider obtained collisions at the highest energy so far achieved in the laboratory, 900 GeV in the c.m., by operating in ''pulsed'' mode. The motivation for the pulsed collider and its performance will be outlined. First results from the UA5 experiment at 900 GeV will be presented, concerning cross-section measurements, charged particle production and a search for Centauro-like phenomena. 20 figs., 20 refs

[en] The Health Physics Research Reactor (HPRR) is a principal research tool for the Dosimetry Applications Research Facility (DOSAR). The HPRR can be operated either as a pulse reactor with fission yields up to 10¹⁷ or at steady-state power levels up to 10 kW. This reactor is an unshielded and unmoderated assembly that provides mixed neutron and gamma-ray fields. The HPRR is continually used as a versatile radiation source for a number of dosimetry and radiobiology studies. Most of these studies are directed toward correlating biological response with absorbed dose. Some of the important continuing radiobiology experiments which utilized the HPRR this year were investigations of lens opacities in mice exposed to fission neutrons, effects of low doses of neutrons on the early embryonic stages of the mouse, dose and dose-rate effects in tumor induction due to high-LET radiation, and effects of neutron irradiation on grain and flowering plants. In an effort to more precisely characterize the radiation fields at the HPRR, a thermoluminescent dosimetry (TLD) system was developed. The use of the HPRR for training and for dosimetry intercomparisons is discussed

[en] Recent developments in high energy particle physics are reviewed. The importance of performing experiments at the highest energies is emphasized, with particular reference to the SPS collider at CERN, which provides the highest energy collisions available in the laboratory at present. A number of important observations at the SPS collider are outlined, such as the discovery of the W and Z bosons, and studies of the scattering of quarks and gluons. A brief account of some topics in cosmic ray physics is then given, since such experiments may give one glimpses of physics in an even higher energy domain. Finally some future prospects in high energy experiments are reviewed. (author)

No abstract available