Nuklearpharmaka — Ihre Entwicklung,Präparation und Anwendungsmöglichkeiten

Radioaktiv markierte Präparate haben in denletzten Jahren in schnell zunehmendem Maße Eingang in die klinische Medizin gefunden. Sie sind beieiner Reihe von Indikationen schon jetzt außerordentlich wertvolle Hilfsmittel bei der Diagnose, besonders bei der Prüfung von Organfunktionen.     

Zusammenhänge Zwischen Radonanomalien und Schwarm-Erdbeben im Oberen Vogtland

Abstract

The results of continuous radon measurements in soil air and the water of a mineral spring at Bad Brambach are presented. They are discussed in connection with meteorological, hydrological parameters, and seismic events with magnitudes <3. The atmospheric pressure (especially pressure gradient), the temperature, and the groundwater level gradient have a significant influence onto radon activity of soil air.

The gamma-activity in spring water is influenced by the water flow rate only.

The results show that the soil air (mean Rn activity 130 Bq · l^?1) and especially the water of the Radonquelle of Bad Brambach (mean Rn activity 25 kBq · l^?1) react upon micro earthquakes with small epicentral distances. Frequently there are precursor effects, that means radon maxima due to the building up of tectonic stress/strain.

About 60% of the seismic events had been attended by radon anomalies during the registration period.

The long term measurements will be continued to investigate possible influences of earthquakes with higher epicentral distances and magnitudes >5 onto the radon regime of the bad Brambach area.     

Präparation und Supraleitungseigenschaften von Zweikomponenten-Diffusionsschichten auf Niob und Vanadium

Earlier experimental work on one-component diffusion of tin into niobium wire or of silicon into vanadium wire has been carried out to prepare diffusion-layers with high-field superconductive characteristics. As a continuation of these investigations, layers have been prepared on niobium and vanadium wire by simultaneous two-component diffusion out of the vapour phase. Here tin or silicon acts as one of the components diffusing into niobium or vanadium respectively, whilst the second component in each case consists of elements chosen from neighbouring regions of the Periodic System. In most cases the introduction of the second component into the diffusion layers results in a decrease of the transition temperature observed for one-component diffusion. It is most probable that this decrease is caused by the high vapour pressure of the second component compared with that of the first, tin or silicon. This would result in diffusion-layers having a greater concentration of the second component. However, it is also to be expected that the rate of diffusion ratio of the two components, which is strongly temperature-dependent, has an important effect on the constitution of the diffusion-layers.     

Absorptionsmessungen an LiF zwischen 0,3 und 0,9 mm Wellenlänge

Measurements of the absorption coefficient and the refractive index of crystalline lithium fluoride have been carried out in the infrared region between 300 and 900 microns wavelength. The spectrometer which has been used was of the periodic interference-modulator type. Some general properties of this instrument are described.