Air humidity and annual oscillations in Sr/Y and Co decay rate measurements.

Parkhomov published decay rate measurements of Sr/Y and Co beta decay sources with Geiger-Müller counters which showed annual cyclic deviations with less than 0.2% amplitude from a purely exponential slope. He investigated instrument instability induced by environmental parameters, yet did not find a clear coincidence with local temperature, atmospheric pressure, and relative humidity.

Effect of diluent on the extraction of europium(iii) and americium(iii) with ,,','-tetraoctyl diglycolamide (TODGA).

Solvent extraction of Eu and Am ,,','-tetraoctyl diglycolamide (TODGA) dissolved in different molecular diluents was studied. The diluent types used in this work were primary and secondary alcohols, secondary ketones and alkanes. Effects of concentration of extracting agent, temperature, diluent type and its carbon chain length on the extractions were determined.

Measurement of the Sm half-life.

The half-life of Sm has been measured by means of the reference source method with a HPGe detector. The long-lived radionuclide Ti was mixed into the source for reference. The time-dependency of the Sm/Ti activity ratio was followed by assessing the count-rate ratio of their characteristic gamma-ray emissions at 61.

First direct determination of the Mo half-life.

This work presents the first direct measurement of the Mo half-life. The measurement is a combination of high-resolution mass spectrometry for the determination of the Mo concentration and liquid scintillation counting for determining the specific activity. A Mo sample of high purity was obtained from proton irradiated niobium by chemical separation of molybdenum with a decontamination factor larger than 1.

On the interpretation of annual oscillations in Si and Cl decay rate measurements.

The Si decay rate measurement data of Alburger et al. obtained in 1982-1986 at Brookhaven National Laboratory have been presented repeatedly as evidence for solar neutrino-induced beta decay. The count rates show an annual sinusoidal oscillation of about 0.