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to monitor the surprisingly high beta countrate that
you get from a cotton pad after drawing air through it with a vacuum
cleaner for a few minutes... presumably due to ionised bismuth and lead
isotopes in the radon 222 decay series, that get stuck to the cellulose
molecules... well described on the site. It's become one of the standard
labs that we do.
Mark.
UWC Adriatic, Trieste, Italy.