||Test Procedure for Gross Alpha Particle Activity in Drinking Water: Interlaboratory Collaborative Study.
Whittaker, E. L. ;
||Lockheed Engineering and Management Services Co., Inc., Las Vegas, NV.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Drinking water ;
Alpha particles ;
Counting techniques ;
Thorium 230 ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Gross alpha activity values were calculated with four different alpha emitting radionuclide standard counting efficiencies to see which standard was best for gross alpha activity determinations. Thorium-230, a pure alpha emitter, appeared to be the best standard for gross alpha counting efficiency. A secondary purpose in the study was to see how well the Ra-226 concentration of a drinking water sample could be estimated from an early gross alpha count subtracted from a late gross alpha count and calculated from the equation provided in the test procedure. The method for gross alpha particle concentration measurement eliminates the dissolved solids interference problem (which is a significant problem for the EPA approved method) and provides for greater sensitivity by allowing for the use of much larger samples in the analysis.