ISSN:0021-1915    

DOI:10.1080/10256018908624033

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Spallation reaction opens new additional possibilities for production of a number of medical useful isotopes. In some cases all the present world demand in produced through spallation. Because of the high transmission of targetmaterials for medium or high energy protons lower cross-sections may be more than compensated by using massive targets. The unspecific nuclear reaction as well as the radiochemical processing of such massive targets lead to several difficulties. New ways for processing of large spallation targets are required. The possibilities of modern ISOL-techniques(ISOL = Isotope Separator On-Line) for the production of medical useful radio-isotopes will be discussed in some detail. Corresponding cross-section data are reviewed and discussed in relation to physico-chemical data requirements. In detail the following radio-isotopes will be discussed: 81-Rb, 82-Sr, 123-I, 167-Tm and 211-At.

ISSN:0021-1915    

DOI:10.1080/10256018908624034

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The structure of the9Be nucleus is considered as being composed of three clusters (two alpha particles and a neutron). The bound state of the9Be nucleus is studied using the approaches of the generator coordinate method as well the three-body model formalism. The numerical calculations are carried out using different types of two-body interactions. Yamaguchi, Gaussian, Tabakin and Volkov type potentials are used. The three-body model is also used in treating the three clusters forming the9Be nucleus by following the Faddeev formalism. In both approaches, the low-lying energy levels of the9Be nucleus as well as its binding energy are numerically calculated. Good agreements are obtained between the present theoretically calculated values and the experimental data.

ISSN:0021-1915    

DOI:10.1080/10256018908624035

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Diagnostic application of57Co-bleomycin (57Co.BLM) is considerably limited by the problem of patients urine contamination with the long-lived radionuclide (T1/2=270 days). A method for decontamination of urine using charcoal (Carbosorb pulvis) was tested in 10 patients examinated by the57Co-BLM scan. About 95% of activity excreted into the urine was eliminated during the first 24 hours after injection. An average decontamination efficiency of 91.8% was obtained using the ratio of 10 g of charcoal/litre of contaminated urine. A method for urine decontamination applicable in clinical practice is proposed.

ISSN:0021-1915    

DOI:10.1080/10256018908624036

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The electrical resistivity of alkali metal TCNQ salts has been measured before and after gamma irradiation with different doses and are discussed. It was found that both the electrical resistivity and the activation energy before and after gamma irradiation depends on the cationic radius. The rate of increase of resistivity for the investigated salts are found to be linearly increased with the increase of cationic radius of the alkali metal.

ISSN:0021-1915    

DOI:10.1080/10256018908624037

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018908624038

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

In the present study thermoluminescence dosemeters (TLD) were used for area monitoring around neutron sources. For area monitoring two techniques were applied. These are the moderating sphere technique and the albedo technique where LiF,6LiF,7LiF as well TLD-200 were used as TLD. Experimental results indicated that the thermoluminescence (TL) output for moderating sphere system is five times the TL output of the albedo system. In order to increase the TL output for the albedo system a paraffin slab was placed close to the albedo system.

ISSN:0021-1915    

DOI:10.1080/10256018908624039

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Groundwater samples from some localities in Qattara depression (especially the eastern part) were collected and subjected to chemical and isotopic analysis. The results of hydrochemical analysis are presented. Generally, the salinity ranges from relatively low (about 500 ppm) to very high values (29 g/l) whereas the Sabkha soil water shows an extremely high salinity reaching about 190 g/l. The environmental isotopic analyses of oxygen-18, deuterium and tritium show that groundwater in this region represents a mixture of several recharging types of water: marine water, paleowater and Nile water.

ISSN:0021-1915    

DOI:10.1080/10256018908624040

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

By neutron activation analysis using the reaction6Li(n, α)3H the concentration of lithium in different kinds of silicon (Gzochralski, float zone refined and neutron transmutation doped silicon, respectively) was determined. About 1015atoms/ cm3has been found. Especially regions in which electrically active lithium up to 1014atoms Li/cm3could be detected by 4.2-K-photoluminescencespeclroscopy were investigated. But no essential differences with regard to the absolute concentration between such regions and regions without electrically active lithium could be found.

ISSN:0021-1915    

DOI:10.1080/10256018908624041

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018908624042

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor