[en] A device for recording neutron radiation and gamma radiation mixed with neutron radiation is described. It consists of an electret ionization chamber the electrodes of which are connected to a pulse analyzing circuit. With a given electret voltage the neutron dose rate can be determined from the pulse rate. The electret voltage, and with it the pulse rate, diminish proportionately to the radiation time. Gamma radiation mixed with the neutron radiation causes additional reduction of the electret voltage, and thus of the pulse rate, without affecting the pulse rate itself. This additional reduction serves as a measure for the gamma dose from which, related to the radiation time, the gamma dose rate can be derived

[en] The radioactivities of ⁴⁰K in the face plate glasses of 9 types of photomultipliers were investigated. Radioactivities of ⁴⁰K in the glasses were measured by the β- and γ- rays spectroscopies. One was 2.2 Bq/g and the others were under 0.2 Bq/g. The concentrations of potassium were checked by the atomic absorption analysis. (author)

[en] The use of two arcs of Pearson type VII distribution makes possible an accurate fitting of X-rays experimental line profile even in the asymmetrical case. This representation can be used, for the Fourier analysis of Bragg reflections, after having done, when necessary, correct background substraction (B.E. Warren, Prog. Mt. Phys., 8, 147-202, 1959), for example with the Langford and Wilson variance method, or directly when the background is thought to be constant in presence of a wide range of experimental data collection. The main errors, which may limit the accuracy of determining the Fourier transform are the following: i) counting statistics; ii) wrong evaluation of the background intensity; iii) unavoidable truncation of the measurement range of the diffraction profile. This method used correctly minimizes such errors. In the present paper are reported: i)basic definitions formulas and program test; ii) fit of X rays diffraction profiles by means of two arcs of Pearson type VII with constant background and analysis of the residua; iii) calculation of the Fourier transform and its error such a propagation of those one on Pearson type VII parameters; VIi) stokes correction of experimental line profile

[en] A device for ioniznng radiation detection is suggested. The device comprising a detector includes a linear narrow pulse shaper, alow level discriminator and a coincidence circuit, here the detector outlet is connected with the inlet of the narrow pulse shaper one of the outlets of which is connected with the inlet of a shaper-integrator and another outlet is connected with the inlet of the low level discriminator, and outlets of both discriminators are connected with inlets of the coincidence circuit. The described circuit ensures increased noise immunity, threshold stability and efficiency of detection do not decrease in this case

[en] A fast microprocessor device has been developed, to allow removal of non-linearity and non-uniformity effects of gamma camera signals. It slips in between a commercial gamma camera and the associated data processing system. Camera signals are digitized by fast ADC and numerically processed in real time. Corrected data are given analogic to be taken into account by process device associated to the camera. The principle is first to correct energy spatial variations by using coefficients determinated during calibration by a uniform radioactive distribution source. Then non-linearity of X and Y signals are removed by translations of them. The displacement coefficient table is given from reference images of parallel line phantom

[en] This bibliography attempts to cover the published literature on the class of radiation detectors most often referred to as 'self-powered'. For this purpose, self-powered detectors are defined as those that have two or more conducting electrodes separated by solid insulation and that generate a signal current without an external power source. Primary sensitivity is unrestricted, but it is usually to neutrons or gamma-rays. The main application is in the core of a nuclear reactor. All relevant facets of the subject are covered including: theory, experiment, development, design, manufacture, instrumentation and application. In addition to the usual reference information, various other designations are included where available, such as CONF-and abstract serial numbers. Where possible, a summary of the content is given with emphasis on specific results and conclusions. Indexing is by author and subject

[en] The National Fire Protection Association requires that the quantity of agent in Halon fire extinguishing systems be verified every six months. The accepted method for determining the quantity of agent has been weighing the containers. Because of problems involved with this method, such as the size of the containers, access, etc., the question what other alternatives are there to weighing halon containers has arisen. This report includes the evaluation and test program whereby the Fire Engineering Group selected and tested alternative methods: the thermal strip tape method, the infrared scanner, ultrasonics, and the radiation detector. Also evaluated, but not tested, were the dip stick method, the pressure supervision method, and weighing using a transducer. As a result of this program, it was determined that weighing is still the most positive method for determining agent quantity, but there are alternatives that can be used. The use of some of these alternatives will provide cost savings, time savings, and maintain the fire protection system in service. However, it will be important for the organization or company intending to use one of the alternative methods, to evaluate and make sure it is compatible with their particular halon protection system

[en] A curved multiwire proportional drift chamber has been built as a general purpose instrument for X-ray scattering and X-ray diffraction experiments with synchrotron radiation. This parallaxe-free one-dimensional linear position sensitive detector has a parallel readout with a double hit logic. The data acquisition system, installed as a part of the D11 camera at LURE-DCI, is designed to perform time slicing and cyclic experiments; it has been used with either the fast multiwire chamber or a standard position sensitive detector with delay line readout

[en] An X-ray test facility is described which provides photon beams of sharply-defined energy in the range 5 to 250 keV. Methods adopted include the use of composite filters and radiator foils. Characteristics of the radiation beams are established, including their intensities, energy spectra, and transverse uniformities, and a novel operating chart is presented. The facility may be employed for a wide range of radiation experiments, and its application to the testing and calibration of radiation measuring instruments is considered in detail

[en] A class of imaging, condensing, and collimating devices for x-rays is investigated which is based on the use of an array of small channels of square cross-section. The focusing and collimating effect arises from external reflection of near-grazing-incidence rays at the interior channel surfaces. Rays are redirected by being singly reflected from two orthogonal channel surfaces and are imaged from a source point to a square region with a side-length M_T + 1 times that of the channel side-length, where M_T is the transverse mangnification. The image and source locations are related by a thin lens formula. The point spread function and the efficiency of these focusing devices are calculated. Two energy regimes with different channel reflectivity characteristics are examined in detail: the hard-x-ray regime (E > 8 keV) and the soft-x-ray regime (E < 200 eV). For these cases the efficiency of focusing x-rays depends only on the channel aspects ratio and reflectivity parameters. A discussion is made of channel plates of other configurations, such as arrays of rectangular channels. The results are supported by Monte Carlo simulations. 26 refs., 13 figs