摘要:

In a gas-solid fluidized bed reactor tlie movement of the solids was investigated using24Na- and140La-marked catalyst, resp. For this purpose different grain size fractions were selected from the catalyst size spectrum and tlieir distributions in the fluidized bed were determined as a function of the product throughput. The marking procedure, the injection device, the electronic measurement technique, the test regime as well as the aspects of health physics to be considered for these investigations are discussed. Then a short description of the general procedure of the evaluation of the measuring results by means of two selected measuring points and of the encountered problems is given

ISSN:0021-1915    

DOI:10.1080/10256018508623418

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

In transparent medium, beta particles and the electrons which are released under certain conditions by the interaction of gamma radiation with the medium, cause Čerenkov radiation. Changes induced by two wavelength shifters (β-Naphthol and 1-Amino-2-naphthol-4 sulphonic acid) are assessed. Color quenching solutions inhibit more widespread use of Čerenkov counting while chemical quenching is shown not to be a problem. The counting efficiency is improved by using polyethylene vials, incorporating wavelength shifters and by using a pulse summation technique.

ISSN:0021-1915    

DOI:10.1080/10256018508623419

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018508623420

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

A equipment is presented, which uses the γ-rudiation of irradiated fuel elements of the Rossendorf Research Reactor in materials research. Nearly 2,5 dm3specimens may be irradiated with over a wide range up to a limit of 106R/h adjustable dose efficency in the installed cylinder source. Easy access exists to the radiation position. Specific supplements were developed for selected experiments in the γ-field. The equipment is suited for experiments during the irradiation.

ISSN:0021-1915    

DOI:10.1080/10256018508623421

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018508623422

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Several samples of copper(I)complexes of quinaldic acid, methyl- and ethyl quinaldates have been prepared and characterized in the solid state. Extensive measurements of thermogravimetric analysis (T.G.A.), the temperature dependence of electrical conductivity and the action of energetic gamma absorbed dose (5.18 × 107/rd) on the temperature dependence of electrical conductivity were conducted and discussed in details. The semiconductivity of materials investigated was established under experimental conditions used.

ISSN:0021-1915    

DOI:10.1080/10256018508623423

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Various samples of lithium alumino-borosilicate glasses have been prepared in a pure state and annealed. Data have been taken on the temperature dependence of DC electrical conductivity and the activation energy for conduction was evaluated in each case. Vickers hardness data have also been obtained as a function of tempering temperature and time for all glass compositions. A co-ordinated explanations of the DC conductivity and Vickers hardness induced by ionizing radiation are put forward and the activation energy for the process of carrier liberation are evaluated for the first time.

ISSN:0021-1915    

DOI:10.1080/10256018508623424

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The IR spectra of polypropylene in the range 700–1800 cm−1has been measured before and after radiation. The principal changes in the molecular structure were the improvement in the stereoregularity and the formation of the carbonyl group C=O and conjugated double bonds (C=C–C= …).

ISSN:0021-1915    

DOI:10.1080/10256018508623425

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

Determination of fluorine adsorbed on inorganic ion exchanger was studied by activation analysis using19F(γ,n)18F and19F(n, α)16N reactions. Hydrated tin dioxide and activated alumina were used as inorganic ion exchangers. After adsorption of fluorine on the column, the exchanger was irradiated by the linear electron accelerator and252Cf fission neutron source, and the content of fluorine was determined by reactivation. The determination of oxygen in silicon single crystal was studied by the reactivation analysis.

ISSN:0021-1915    

DOI:10.1080/10256018508623426

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The microprocessor based 4096-channel-memory (single stand by crate) allows the parallel coupling of two Ge(Li)- gammaspectrometers via DMA (4 μs dead time) and a programmed input (ca. 150 μs dead time), the accumulation of 32k counts per channel and the free definition of ROI's. The software organizes the versatile use of low-price periphery (oscilloscope, line printer, key board) and carries out the quantitative evaluation of the spectra. Tlie device has been applied in low- and high-level spectrometry and as a general purpose microprocessor.

ISSN:0021-1915    

DOI:10.1080/10256018508623427

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor