Journal of Radioanalytical and Nuclear Chemistry

, Volume 314, Issue 2, pp 767–771 | Cite as

Phase stability and lithium loading capacity in a liquid scintillation cocktail

Article
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Abstract

Liquid scintillation cocktails loaded with neutron capture agents such as 6Li are used in both neutron and neutrino detectors. For detectors designed to operate over extended timespans, long-term stability can be a concern. We demonstrate the identification of thermodynamically unstable emulsions as distinct from stable microemulsions, driving phase separation with centrifugation. Phase separation was identified by monitoring the quench indicating parameter, measured using an external Compton source. Samples were also characterized by dynamic light scattering, where in an extreme case, phase separation could be observed in real time. We describe a stable cocktail with 0.01 mass fraction added Li, a relatively high Li concentration.

Keywords

Phase separation Inverse beta decay Neutrino Neutron Liquid scintillation 6Li 

Notes

Acknowledgements

We thank J. LaRosa (NIST) for assisting with some of the experiments, the Bioprocesses Measurements Group (NIST) for access to dynamic light scattering instrumentation, and the Liquid Scintillation Working Group of the International Conference on Radionuclide Metrology (ICRM) for interesting discussions.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2017

Authors and Affiliations

  1. 1.Physical Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgUSA

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