[en] This work is related to calculations of electronic recombination rates, as a function of electronic density, electronic temperature, and ion nuclear charge. Recombination times can be calculated and compared to cooling time, in cooling processes of ion beans by electrons from storage rings. (A.C.A.S.)

[en] Using the quasi-potential form of the phase shifts in the JWKB approximation and choosing a particular functional form to insure the correct behaviour of the ion-atom interaction we have constructed the potential through the Sabatier transformation. Numerical computations are given for the ion-atom case. (author)

[en] A model is presented that enables the determination of the total electron bare-ion recombination-rate coefficient for various values of the electron density and temperature and for all values of the ionic charge. (author) 11 refs., 10 figs

[en] Full text: One of the essential tools for assessing the ALARA principle in the occupational exposure of workers in nuclear facilities is the availability of data on collective doses in order to be able to see the evolution of the implementation of the ALARA principle compared with the plant itself and also with other similar plants (benchmarking analysis). This paper shows a benchmarking analysis on the implementation of the ALARA principle in the Spanish nuclear park based on the evolution of occupational exposure from 1980 to 2006 within an international frame including a detailed individual analysis describing the relevant operations and factors influencing the annual collective dose in the Spanish reactors. For this purpose, data from the ISOE database, world's largest database on occupational exposure data in nuclear power plants, have been used. The analyses shows a common decreasing trend in the evolution of the annual collective dose for both types of reactors in Spain, pressurized and boiling water reactor. Nevertheless, this general decreasing trend shows some temporary increases when analysing individual plants. A decade ago, the relationship between collective doses in Spain and the total of reactors participating in ISOE was inverted being since 1997 lower than the average doses in the ISOE world. This reduction is the result of a jointly effort between the regulator and the utilities being a major achievement regarding the ALARA implementation in Spain. However, we cannot afford to become complaisant as there are still some challenges to face at the level of individual reactor. Details of this challenges are also presented in this paper. (author)

[en] In Spain, the Regulation on Sanitary Protection Against Ionising Radiations (Royal Decree 783/01) came into force on 6 July 2001 and: - Implement the majority of the Basic Safety Standards Directive 96/29/Euratom (BSS Directive) in Spain; - Replace Regulation on Sanitary Protection Against Ionising Radiations (Royal Decree 53/92) which was made in response to the 1980 BSS Directive 80/386/Euratom (as amended by 84/467/Euratom). In the past, RPM complied with the replaced R.D 53/92, the structure and content fitting the Nuclear Safety Council Safety Guide 7.6 'Content of the Radiation Protection Manuals in radioactive and nuclear facilities of the fuel cycle'. The necessary revision of the RPM owing to the new RD 783/01 entailed a clear occasion to achieve a higher degree of homogeneity in the scope and content of some issues that could be subject to interpretation. Seizing the opportunity, the CSN and the Spanish Association of Electricity Utilities (UNESA) set up an ad-hoc working group constituted by the NPP Radiological Protection Department Heads and the Regulatory Occupational Radiological Protection experts. The driving force of the group was to lay the foundations of a generic document based on homogeneous and coherent radiological criteria that could be used by the facilities as a guidance to produce their respective Radiation Protection Manuals. (authors)

[en] A series of ceramic oxides were prepared by adding alumina to the superconductor YBaCuO. The solids were characterized by x-ray diffraction, transmission (TEM) and scanning electron microscopy (SEM) with EDS and electrical measurements. Partial drops in electrical resistance (R ≠ O) indicate the presence of superconducting phases trapped in ceramic masses. Additionally, the systematic diminution of Tc could indicate a partial substitution of Cu by Al

[en] On the thirtieth anniversary celebration of the ''Instituto de Asuntos Nucleares'', a historical review of its activities has been made, emphasizing on its politics of development, technological and scientific advances, including the goals and accomplishments attained for the uses and applications of nuclear technology in Colombia. This includes the technical assistance which is being provided by International Organizations. National and international influences are shown for each one of the technical areas: agricultural applications, industrial applications and metallurgy, biochemistry and radiopharmacy, development process, nuclear electronics, solar and non-conventional energies, gamma facility, nuclear physics, hydrology, raw materials, chemistry, health radiophysics, reactor, nuclear documentation and information center and administration

[en] In this paper we briefly report on the calculational system and philosophy followed by our group, for the conversion of the 10 Kw-R1 research reactor from high enriched uranium (HEU) to low enriched uranium (LEU). Some preliminary results are shown

[en] A series of ceramic oxides were prepared and characterized by DTA, x-ray diffraction and resistivity measurements. Partial drops in the electrical resistance were detected in the compounds Y/sub 3-x/(BaSr)/sub x/Cu/sub 3/O/sub 5-y/, which could be associated with partial superconductive phases

[en] The physics department designed a two beam channel facility a small ion-accelerator. According to the present status, the first beam channel will be available at the end of 1987