Could you elaborate by what method you are measuring the U-235 to one thousandth percent? On Oct 23, 2007, at 10:30 AM, Redmond, Randy (RXQ) wrote: > I am being currently held to 0.711 percent. J. Marshall Reber, ScD 165 Berkeley St. Methuen MA 01844 Tel/Fax: 978-683-6540 Alternate Email: reber at alum.mit.edu