Open-File Report 2007-1231

U.S. GEOLOGICAL SURVEY
Open-File Report

Methods and Data Used to Investigate Polonium-210 as a Source of Excess Gross-Alpha Radioactivity in Ground Water, Churchill County, Nevada

By Ralph L. Seiler

Revision History

Current version and date of current release: 1.10 April 24, 2008

Historical list of revisions

Version 1.10 - April 2008

Polonium values for 9 samples in table 2 were recalculated to sampling time.

A polonium value for a filtered sample had inadvertently not been included and has been added.

Tables 1 and 2 have been modified to show whether samples were filtered or unfiltered.

The depth of one well was updated based on new information.