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We use sodium dodecyl sulfate (SDS) solutions to create the micelles.
The SDS solution is put into a test tube along with our radioactive
source (22Na). The source releases positrons which pick up an
electron and become positronium atoms that can diffuse into the
micelles. The Ps lifetimes are determined by two plastic scintillators.
These scintillators send their signals to constant fraction discriminators
that filter and clean up the signals. A time-to-amplitude converter
determines the Ps lifetimes and sends the data to digital I/O
board where it is read by data collection software.
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