摘要:

A general view of deutrium and oxygen-18 content found in modern groundwaters in Central Europe is presented. Both nuclides show a characteristic continental gradient of depletion in precipitation and modern infiltration waters from west to east and north to south: σD between –5 … –10‰ to –1.5‰per 100 km and –10‰per 100 km, respectively. An additional depletion is given in the mountain belt in dependence on the elevation. Old groundwaters are depleted in deuterium up to 12 ‰ in relation to modern infiltration waters. Such groundwaters are well known from Central Europe and other parts of the world. The use of natural deuterium variations of groundwaters in the GDR is considered in connection with the dry-weather Glow in this region.

ISSN:0021-1915    

DOI:10.1080/10256018708623855

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In this article, several samples of double doped zirconia were carefully prepared and sintered using various conditions of the high temperature ceramic procedure. On these samples, several measurements were undertaken including porosity, shrinkage, dynamic microhardness and the temperature dependence of DC – electrical conductivity before and after an absorbed energetic γ-radiation dose (5.26 × 107rd). Results obtained were all in conformity, explained, interpreted and discussed in details on the basis of the interaction of dopand and γ-radiation with either zirconia and/or doped zirconia lattices.

ISSN:0021-1915    

DOI:10.1080/10256018708623856

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A micro computer code is introduced. It has been developed essentially for neutron activation analysis application. The code is quite general and modular that it may be found useful in various routine analysis of data by regression analysis technique.

ISSN:0021-1915    

DOI:10.1080/10256018708623857

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

For study of distribution of several elements (mainly boron) in the brazed joints of Ni-base alloys and for optimization of post-bond heat treatment of the joints the neutron induced autoradiography (NIAR) using solid state nuclear track detectors (SSNTD) has been applied. For a big isotopic neutron source252Cf a special hexagonal tank was constructed, which is filled with water and in which walls the irradiation channels are placed. The comparative autoradiographs of the same samples have been performed both on the isotopic neutron source252Cf and the reactor ŠR-0.

ISSN:0021-1915    

DOI:10.1080/10256018708623858

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The method of radioactive tracers was used for measurement the depth of liquid zone. The experimental work was run under common technological conditions.

ISSN:0021-1915    

DOI:10.1080/10256018708623859

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A device with a low-pressure multistep avalanche chamber for thermal neutron imaging was developed and tested on a neutronographic beam of the nuclear reactor. The device operates on-line with a minicomputer. The detection efficiency of thermal neutrons is better than 3%, while the detection efficiency of 60 keV γ-quanta is less than 10−6.

ISSN:0021-1915    

DOI:10.1080/10256018708623860

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The influence of beta backscattering on optical density in autoradiograms was determined. Three different geometric models of practical exposition arrangements were tested and their significance for the quantitative evaluation of auto-radiograms was determined. The dependence of the backscattering effect on the beta particle energy was estimated using the radionuclides99Tc,201Tl and90Sr/90Y in the form of an autoradiography beta calibration set and in the form of radioactive labelled foils. Different materials were used as backscattering objects. The quantitative results of this investigation are discussed from the aspect of standardization of quantitative autoradiographic methods.

ISSN:0021-1915    

DOI:10.1080/10256018708623861

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The process for catalytic radioiodine labelling of o-iodohippuric acid at a 40 GBq level of Nal31I is described. The in vitro stability of this radiopharmaceutical was investigated and different variants are shown for improving radiochemical purity. The described labelling procedure is used in the routine-production process.

ISSN:0021-1915    

DOI:10.1080/10256018708623862

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The autoradiographic method has been used for investigation of the local distribution of water diffused into composites consisted of epoxide matrix and carbon fibres. The autoradiographs have shown the inhomogeneity of the concentration of water diffused in the composites. The Joyce-Loebl Mark III microdensitometer served for the quantitative evaluation of the autoradiographs. Autoradiographs made from plastic standards containing tritium have been employed for calibration of the optical density scale of densitometric curves. From the results it can be seen local concentration of the diffused water. The results of autoradiographic measurements have also been correlated to those of ultrasonic ones. From the results it follows that the composite probes with incorrect lamination absorb more water than those with perfect lamination.

ISSN:0021-1915    

DOI:10.1080/10256018708623863

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Experimental results are presented to show that the registration of heavy charged particles by solid state nuclear track detectors obeys more the Neyman type A distribution than the Poisson one as has been believed up to now. The theoretical background of this finding is given in detail.

ISSN:0021-1915    

DOI:10.1080/10256018708623864

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor