0000000000433192
AUTHOR
E. Stender
An improved system for fast, continuous chemical separations (“SISAK 2”) in nuclear spectroscopic studies
Abstract An improved rapid, continuous solvent extraction system (“SISAK 2”) is described. The system is connected to a gas-jet installed at the Mainz reactor. It allows single or multistage chemical separations of liquid phases by means of specially designed centrifuges within ∼1 s per stage. The application of this system to study short-lived nuclides is exemplified for neutron-rich lanthanum and cerium isotopes produced by fission.
Comparison of the efficacy of chemomechanical caries removal (Carisolv') with that of conventional excavation in reducing the cariogenic flora
Summary. Objectives. The usage of minimally invasive procedures and attention to patient comfort are of great importance, especially for dental treatment in small children. This has led to the development of chemomechanical methods for caries removal. The aim of this study was to compare the efficacy of chemomechanical caries removal with that of conventional excavation in reducing the count of the cariogenic flora. Design and setting. Subjects for this study were chosen from children admitted to dental clinic for restorative procedures under general anaesthesia. Samples and methods. Twenty-one children (mean age 43·5 ± 12·0 months) with early childhood caries were included in this stu…
The on-line isotope separation facility helios at the mainz reactor
Abstract The on-line isotope separation facility HELIOS consisting of a helium-jet transport system coupled to a high transmission mass separator is described. The main characteristics of the system were determined from γ-ray measurements on neutron-rich nuclides. The transmission from the target to the skimmer is about 60%; the overall efficiency for typical fission product elements is 0.05–0.2% and the transit time for Cs is about 1.0 s.
Chemical reactions in a gas-jet recoil-transport system: Continuous separation procedure for selenium and tellurium from fission products
Abstract Chemical selectivity in a gas-jet recoil-transport system can be achieved by chemical reactions with the carrier gas. This is demonstrated for an ethylene-nitrogen jet in which volatile species of selenium and tellurium are formed by passing the gas through a reaction zone heated to 860°C. Rapid continuous separation procedures for selenium and tellurium from fission products based on this effect are described and some decay data of the neutron-rich nuclides 85–88Se and 135–137Te obtained with these methods are given.