摘要:

Excitation functions for (d, n)- and (d, 2n)-reactions on natural unenriched tellurium has been measured simultaneously in the energy range between 5 and 13.7 MeV using stack foil technique. The maximum cross section for the 122-Te(d, n) 123-I reaction is 400 · 10−31m2(400 mb) at 9 MeV deuteron energy. The thick target yield for 123-I production via (d, n)-reaction on enriched 122-TeO2was determined to be 55 M Bq/μAh. The main impurity is the 130-I produced in the (d, 2n)-reaction on 130-Te impurities in the target material.

ISSN:0021-1915    

DOI:10.1080/10256018808624001

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

During December 1987 a microtron was put into operation at the Central Institute of Isotope and Radiation liesearch Leipzig. The maximum electron energy and current planned amounts to 25 MeV and 10 … 20 μA, respectively. After few weeks of operation an energy of 17 MeV was obtained. After conditioning the accelerator will be used preferably for activation analysis and radionuclide production. Some important components of the accelerator and possible applications are briefly discussed.

ISSN:0021-1915    

DOI:10.1080/10256018808624002

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

By means of the horizontal eleclrophoresis in carrier-free electrolyte solutions could be found conditions for a rapid and selective separation of mendelevium from the products of heavy ion reactions (2l9Bk +22Ne) and the investigation of hydrolysis, reduction and complex formation. As non-isotopic tracers for experiments with Md(III) and Md(II) were used152/154Eu and87mSr.

ISSN:0021-1915    

DOI:10.1080/10256018808624003

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Individual ion mobility of201Tl(I)= +7.3 (3) X 10−4cm3s−1V−1was observed at 298.1 ± 0.1 K in aqueous solutions of H(K)ClO4, 1.5 · 10−3≦ μ ≦ 0.5 and 0.3 ≦ pH ≦ 6.5. Experimental dependences of201Tl(I) overall ion mobilities on concentrations of ligand anions in solutions of perchlorate background electrolytes have been used to calculate stability constants of neutral thallium complexes Tl I and Tl Br at 298.1 ± 0.1 K and μ = 0.1. They are 115 ± 25 l · mol−1, and 5.25 ± 0.35 l · mol−1respectively.

ISSN:0021-1915    

DOI:10.1080/10256018808624004

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Stoichiometric stability constants of the thallium (I) sulphate complex [Tl(SO4)]−have been determined by measurements of the201Tl.Tl(I) ion mobility at 298.1 (1) K in solutions of Na2SO4/Na(H)ClO4, μ = 0.1, pH ≦ 4, and Na2SO4/H2SO4, 0.1 ≦ μ ≦ 0.48, pH 2–2.5. The thermodynamic stability constant of this complex anion of= 15.7(1.0) 1 · mol−1has been calculated on the basis of experimental data.

ISSN:0021-1915    

DOI:10.1080/10256018808624005

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The ion mobilities of211At−and131I- in Na(Li)ClO4methanolic and ethanolic solutions containing N2H4· H2O were measured by horizontal zone electromigration. Basing on electrostatic model of Fuoss-Onsager the limiting mobilities, the tracer diffusion coefficients, the Stokes radii and the numbers of salvation were calculated for both ions and related to the other halides. These values of211At−and131I−are in good agreement with the other halide ions. This shows that the measurements method is able to be used for non-aqueous solutions with viscosities of η≦ g 1.5 cP and dielectric constants ofe≧;6.

ISSN:0021-1915    

DOI:10.1080/10256018808624006

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The determination of fluorine in geological material by photon activation analysis based on the19F(γ, n)18F reaction is described. After irradiation fluorine is separated by steam distillation of hexafluorosilicic acid and precipitation as CeF3. Labelling of the cerium reagent solution by141Ce enables a simple correction of separation losses. The method was applied to the ZGI standard rock granite GM.

ISSN:0021-1915    

DOI:10.1080/10256018808624007

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

This review is devoted to two anniversaries that of the invention of the Geiger-Mueller counter sixty years ago and that of the development of the scintillation counter forty years ago. Besides the history described the importance at the present time is emphasized. The advances made in further improvements of these detectors arc considered.

ISSN:0021-1915    

DOI:10.1080/10256018808624008

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018808624009

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor