Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Micellar phase boundaries under the influence of ethyl alcohol



Denis E. Bergeron


The Compton spectrum quenching technique is used to monitor the effect of ethyl alcohol (EtOH) additions on phase boundaries in two systems. In toluenic solutions of the nonionic surfactant, Triton X-100, EtOH shifts the boundary separating the first clear phase from the first turbid phase to higher water:surfactant ratios. In a commonly used scintillant, Ultima Gold AB, the critical micelle concentration is not shifted. The molecular interactions behind the observations and implications for liquid scintillation counting are discussed.
Applied Radiation and Isotopes


liquid scintillation counting, critical micelle concentration, ethanol, cocktail, microemulsion, reverse micelle


Bergeron, D. (2016), Micellar phase boundaries under the influence of ethyl alcohol, Applied Radiation and Isotopes, [online], (Accessed June 23, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created May 16, 2016, Updated February 19, 2017