Release of Dissolved ⁸⁵Kr by Standing

Abstract

The experiments on the release of dissolved ⁸⁵Kr by standing at room temperature were carried out to examine the influence of liquid level in a sampler and properties of solvent on the release efficiency. Six kinds of organic solvents as well as water were taken as solvents.
The half-life period in case of the decrease in concentration of the dissolved ⁸⁵Kr which was used as an index of release efficiency, was proportional to the liquid level in the sampler and was inversely proportional to the diffusion coefficient of Kr gas in solvent. For organic solvents belonging to homologous series, the half-life period became longer with increasing the carbon number of solvent molecule. From the relationship between the half-life period and the carbon number, the release efficiency in the dissolved ⁸⁵Kr can be predicted for any commonly used solvent as a practical application. This method was found to be an effective means of removing the dissolved ⁸⁵Kr of low level though it takes rather long time.