[en] A gas-scintillation counter is developed. The gas is a 10% xenon and 90% helium mixture and is streaming through. The counter is used for discrimination between the heavy and the light fission fragment. (author)

[en] A parallel-plate spark counter consisting of an eight-gap array of coaxial cylinders surrounding a two-liter liquid hydrogen target is nearing completion. An optical system with some unusual features has been devised to permit a direct measurement of particle trajectories in cylindrical coordinates. The essential design features and test results are given. (author)

[en] Semi-conductor counters for the detection of fast and slow neutrons and their use for measuring neutron-flux distribution in the RA reactor in Vinca are described. (author)

[en] A solid-state ionization chamber has been made by diffusing phosphorus into high-resistivity silicon to form ohmic contacts. Such a detector has been successfully used to detect 30-MeV protons. Preliminary results are given and discussed. (author)

[en] A slow neutron scintillation counter is described; the detector consists of a mixture of dihydrodecaborane with zinc sulphide. The recording efficiency for neutrons is 10% at a neutron energy of 1 eV and about 1.5 to 2% at an energy of 50 eV. The counter is almost completely insensitive to gamma radiation. (author)

[en] Nuclear instruments are used in almost every phase of atomic energy work, from assessing health hazards and prospecting for nuclear materials to plant control and nuclear physics experiments. The demands on nucleonic instrumentation are growing steadily. High-energy particle physics need such instruments for measuring extremely short times; in various research experiments most advanced electronic systems are required; and routine applications of radioisotopes call for more reliable instruments for automated counting facilities. In order to give designers and users of nuclear instrumentation an opportunity to discuss the research results and to exchange information on recent developments and new designs, the International Atomic Energy Agency, in co-operation with the Federal Nuclear Energy Commission of Yugoslavia, organized a Conference on Nuclear Electronics which was held in Belgrade from 15-20 May 1961. It was attended by more than 300 scientists from nearly 30 countries and five international organizations. Over 150 papers were read and discussed. As the field of nuclear electronics has expanded considerably, it was impossible to discuss all aspects of nuclear electronics in one series of meetings. Included in the main topics were radiation detectors, electronic circuitry in conventional and fast-pulse techniques and advanced electronic systems used in nuclear research. The Proceedings presented in these volumes contain the full records of the Conference, including discussions. The present state of technique, together with current trends and developments, are outlined. Of particular value should be the world-wide survey on progress recently made in such fields as those connected with semiconductor detectors, spark counters, luminescence chambers and fast electronic facilities for nuclear physics research. Together with the Proceedings of the Symposium on the same subject held in Paris and also published by the International Atomic Energy Agency, these volumes offer reference materials very useful to scientists and engineers directly engaged in the development and design of nuclear electronic instruments, as well as to all those who use these instruments in their research and routine work-in developed as well as developing countries.

[en] The authors present a new type of detector-''a spark chamber'', which is similar, in its principle of operation, to the spark counter. Unlike the latter, the spark chamber has a pulse-feed. The detector is simple in design and easy to operate ; it can be used for following particle trajectories ;- it possesses high time and space resolution; finally, it can be made to large dimensions. (author)

[en] A spark counter for neutronographic purposes has been constructed. It is known that a spark counter with a suitable distribution of anodes and cathodes may be used to obtain diffraction patterns. The high resolution and the possibility of measuring the intensity of diffraction peaks are made possible by means of a new, improved counting device. Two moving electrodes of this counter explore a large area in order to obtain the diffraction patterns which are recorded mechanically. (author)

[en] Butslov et al. (Proceedings of IV Congress on High-Speed Photography, Cologne, 1958) have published an account of their work on an Image Intensifier Chronograph useful in connection with spark counters. Comments are made on extensions of this technique with respect to different kinds of output, deflection and shuttering. In particular some of the problems connected with multi-stage intensifiers will be considered. As a result of some experience in experiments of this type an attempt has been made to make small-diameter fibre scintillators for both detectors and output screens. (author)

[en] One of the main methods employed in slow-neutron spectrometry is the time-of-flight method. The paper describes two detectors intended for time-of-flight work-a neutron detector for measuring total cross-sections, and a capture gamma-ray detector for measuring radiationcapture cross-sections and self-absorption cross-sections. The paper also indicates how the detectors are used and the results obtained with them. (author)