[ RadSafe ] Gross Alpha questions

Michael E. Kitto mek14 at health.state.ny.us
Fri May 11 08:19:48 CDT 2012

Gross alpha activity can be determined by measuring planchets on
gas-proportional counters.  We have a limit of 100 mg (5 mg/cm2) of
precipitate on the planchet.  Does anyone have a method of estimating the
maximum volume of a water sample that can be evaporated to stay below this
limit without "trial and error" or pre-evaporation of small aliquot ?  For
example, will a conductivity meter or turbidity measurement provide an
estimate of the amount of dissolved solids?  I am looking to develop a
correlation of the measured precipitate (dissolved solids) with a (yet to
be determined) parameter.  Thanks in advance, Mike Kitto

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