摘要:

An onedimensional approximated formula for forward scattered 60 keV photons in dependence on the ash content and mass per square area in lignite is given. By means of realistic data evaluated from coals of various ash contents but constant level it could be shown, that ϱX or ϱ-changes could be corrected by means of 660-keV-Photons. The formula allows to reduce the mean standard deviation of the correlation between intensity of scattered photons and ash content by factor 2.

ISSN:0021-1915    

DOI:10.1080/10256018608623717

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Modern radiometric analytics demands a complex consideration of nuclear and electron shell processes, if more pretentious aims are envisaged. As an example the small variation of decay rates of radionuclides presents possibilities for information on chemical situations of decaying atoms. In principle this phenomenon is well known since many years, but now the situation is such that, e.g. in99mTc internal conversion, a full agreement of the difficult experiments and the respective theory was established. The secondary emission of X-rays as a consequence of high excitation of electron shells in combination with nuclear transitions supplies another example for a methodical progress of radiometry. Investigations on51Cr as an electron capture nuclide have shown that chemically induced variations of the Kαto KβX-ray intensity ratio is at least qualitatively understood.

ISSN:0021-1915    

DOI:10.1080/10256018608623718

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This paper reviews ways in which radioactive tracer techniques can he used to improve the efficiency of a caprolactam production plant, Residence time spectra and material distributions in different parts of the plant were measured by application of sodium 24, bromine 82 and technetium 99m. The investigations led to improved cumeneoxidators and gave useful informations on the catalytic decomposition of the phenolic tar and the hydrogenation process of phenol. It could he shown that the construction of the lactam extractor must he varied and the results of the tracerexperiments made in the distillation unit contributed to a higher quality of the final product.

ISSN:0021-1915    

DOI:10.1080/10256018608623719

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Ion beam techniques are widely used jur modification as well us analysis of materials in development and production of VLSI circuits and their importance is continuously increased in course of the reduction of structure dimensions. Some possibilities and problems connected with the application of ion beams of low energy in the pattern transfer are- described and the stage of development achieved in the Central Institute of Isotope and Radiation Research is outlined.

ISSN:0021-1915    

DOI:10.1080/10256018608623720

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The activity of Ni–Cr2O3catalyst for the deuterium exchange reactions between hydrogen and ammonia, as well as for hydrogen and water vapor has been measured in dependence on the reaction temperature and on partial pressure of ammonia and water vapor, respectively. In both cases the activity in dependence on the partial pressure shows a maximum; the maximum of activity for H2–NH3exchange is situated between partial pressures of 0.05 and 0.25, and for H2–H2O reaction between 0.25 and 0.5. The Ni–Cr2O3catalyst is about 2.4 more active for the exchange reaction H2–H2O than for H2–NH3. For both reactions, chromia has a strong promoting effect, enhancing the activity per gram of catalyst of about three orders of magnitude in comparison with that of the Nickel black.

ISSN:0021-1915    

DOI:10.1080/10256018608623721

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The paper is the review of current state of the application of radiation chemistry and radiation technology for environmental conservation. Some aspects of radiation treatment of natural water, radiation purification of aqueous wastes, radiation treatment of sewage sludge and radiation purification of exhaust gases are considered. The special attention is paid to the works of Soviet authors.

ISSN:0021-1915    

DOI:10.1080/10256018608623722

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The formation of Technetium nitrido- and thionitrosyl-complexes was investigated by means of15N labelled compounds. The course of the reaction is rather different with the elements technetium and rhenium in spite of quite analogous starting materials and products. A new feasible synthesis of nitridotechnetium (V) complexes was found from complexes of Te(III) and azide. By15N-substitution an unambiguous assignment of characteristic infrared bonds in the complexes was achieved.

ISSN:0021-1915    

DOI:10.1080/10256018608623723

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018608623724

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Investigations were carried out on 350 Wistar rats irradiated with doses of 52, 103, 155 and 205 mC. One or five days after irradiation the rats were given intragastrically dose of Na275SeO3(0.2 cm3, 3.34 kBq). The radioactivity of organs and tissues at 3, 6 h and 1, 2, 4, 8, 14 days after isotope administration indicated that irradiated rats did not differ significantly from not irradiated rats in distribution of radioselenium. Moreover the differences were transient and did not correlate with the exposure doses.

ISSN:0021-1915    

DOI:10.1080/10256018608623725

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Examining metallurgical structures by means of autoradiography one needs answering the question whether the geometrical shapes of component arrangements visible as dark spots are determining the type and parameters of probability distribution. Testing this question some autoradiographic models have been prepared representing different shapes of appearance of labelled components and 14 models presenting components of different size and density of appearance have been realized. The conclusions drawn from this studies will be used in further improvements of the description of alloy structure.

ISSN:0021-1915    

DOI:10.1080/10256018608623726

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor