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[en] A scintillation type gamma ray spectrometer employing coincidence counting, designed and built at the Physics Department of the University of Western Ontario is described. The spectrometer is composed of two anthracene and photomultiplier radiation detectors, two pulse analyzing channels, a coincidence stage, three scalers and a high voltage stabilized supply. A preliminary experiment to test the operation of the spectrometer was performed and the results of this test are presented. (author)
[en] An analysis is made of the heat produced by the absorption of gamma rays in a sample placed into a reactor. It is clearly shown that enormous local (space) variations in gamma flux exist in current reactors. An application to the Hanford reactors is treated in some detail. Although the estimates obtained may be good to but a factor of two, it is clearly shown that in most cases the major portion of the heating is due to (n, γ) reactions within the sample itself, and in some cases to the gamma rays generated in liners and cans, and not from the gamma rays generated in fission, nor from the moderator. Some implications of these results are discussed, among the most important being their application to radiation chemistry in reactors. Several mathematical results for absorption and generation of gamma rays in various bodies which should be useful in estimating dosage rates for samples irradiated in reactors are given (Appendix II). A method for making the calculations for an arbitrary absorption law are given (Appendix III). This method may be used with the true absorption law for gamma rays or even for the calculation of the absorption of the energy of particles possessing a range law of absorption, e.g., γ-rays or protons.
[en] We describe a separator of isotope with a 60 deg magnetic sector that permits, thanks to a process of neutralization of the space charge, to use efficiently intense ion beams. The ion source for solid is essentially constituted by a discharge of hot cathode in a magnetic field and provides an ion beam focused of more than 10 mA. The result of the first separations (Zn, Sb, Hg) indicates that the isotopes of various elements can be obtained in quantities varying from 10 to 100 mg/24 hours. (author)
[fr]0n decrit un separateur d'isotope a secteur magnetique de 60 deg qui permet, grace a un procede de neutralisation de la charge d'espace, d'utiliser efficacement des faisceaux d'ions intenses. La source d'ions pour solide est essentiellement constituee par une decharge a cathode chaude dans un champ magnetique et fournit un faisceau d'ion focalises de plus de 10 mA. Le resultat des premieres separations (Zn, Sb, Hg) indique que les isotopes de divers elements peuvent etre obtenus en quantites variant de 10 a 100 mg/24 heures. (auteur)
[en] The French counterpart of the U.S. AEC is actively engaged in showing industry how radioactivity can solve some of its problems. Six specific problems, the methods of attack and results are discussed. Reprint of a paper published in 'Nucleonics', vol. 9, no. 5, Nov 1951, p. 53-59.
[en] In the solid atomic theory, inter-ionic forces are explained by considering ions as formed by a nucleus surrounded by electronic layers with spherical symmetry, at least for normal ions (non para-magnetic). With such a model and for a highly symmetrical crystal, it is impossible to make evidence of a deviation in Cauchy relationships if the deformation of ions under the effect of the crystalline field is not taken into account. The author reports that this deformation exists, even if the crystal symmetry is high and can be estimated. Reprint of a paper published in 'Journal de Physique et le Radium', t. 13, Apr 1952, p. 243.
[en] A new radioactive well logging device with a neutron source is proposed. An electric motor is used to enable measuring the distance between the neutron source and the torpedo receiver without withdrawing the torpedo to the surface. The device involves no danger of the personnel being exposed to irradiation, and the efficiency of logging is substantially improved owing to the time saving factor ensured by eliminating superfluous operations
[en] A Geiger counter model intended to equip portable devices for prospecting with beta and gamma rays is presented. The quality requirements of this meter were: relatively low operating voltage (360 V), automatic shutdown, stability of characteristics for at least 2 years, correct operation in temperatures ranging from -30 C to +50 C without the need to change the operating voltage when the meter temperature varies between these limits. The mode of construction and some properties of such a beta and gamma ray counter, filled with a neon-argon-bromine mixture, are described. The counter is stable and robust, operates at low voltage (350 V) and is not very sensitive to temperature variations between -70 C and +125 C. Reprint of a paper published in 'Il Nuovo Cimento', vol. IX, no. 2, Feb 1952.
[fr]On decrit le mode de construction et quelques proprietes d'un type de compteur a rayons beta et gamma, rempli d'un melange neon-argon-brome. Les compteurs de ce type sont stables et robustes, fonctionnent a basse tension (350 V) et sont peu sensibles aux variations de temperature entre -70 deg. C et +125 deg. C. Reproduction d'un article publie dans 'Il Nuovo Cimento', vol.IX, no. 2, feb 1952.
[en] Study, with the help of a self-commanded chamber, of ions behaviors created in this one by a α particle. The authors put in evidence the phenomenon of multiplication and recover the required conditions for the working of the proportional counters. They verify that the ions reach quickly a steady aggregation state in their gas-steam mixture. These aggregations have a middle mobility of about 0,9 cm2.V-1.sec-1. They signal an unexpected phenomenon that they assign at a thermodynamic reason. (author)
[fr]Etude, a l'aide d'une chambre autocommandee, du comportement des ions crees dans celle-ci par une particule α. Les auteurs mettent en evidence le phenomene de multiplication et retrouvent les conditions requises pour le fonctionnement des compteurs proportionnels. Ils verifient que les ions atteignent rapidement un etat d'agregat stable dans leur melange gaz-vapeur. Ces agregats ont une mobilite moyenne d'environ 0,9 cm2.V-1.sec-1. Ils signalent un phenomene inattendu qu'ils attribuent a une cause thermodynamique. (auteur)
[en] The separation of 0.5 γ Li+ from a quantity of Ca+2 (up to 0.5 g) by cation-exchange resins is described. Reprint of a paper published in 'Analytica Chimica Acta', vol. 6, Apr. 1952
[fr]On decrit la separation, sur resines echangeuses de cations, de 0.5 γ Li+, d'une quantite de Ca+2 pouvant atteindre 0.5 g. Reproduction d'un article publie dans 'Analytica Chimica Acta', vol. 6, avril 1952.