Letters Received to C.W. Wallhausen, February 27, 1947

FREDERICK B. FLINN COLUMBIA UNIVERSITY 15 AMSTERDAM AVENUE NEW YORK 23, N. Y. ILL CIRCLE 7-1840 Ext. 26 281948 February 27, 1947 Mr. C.W. Wallhausen United States Radium Corp. 535 Pearl St. New York City, N.Y. Dear Mr. Wallhausen: I am rather puzzled about the radioactivity that is being found in some of the girls which are just starting to work with radium. I have cleaned the flasks with acid and yet the last test by Dr. Hess shows that the activity is high. On the other hand I cannot help but feel that the flasks are alright because the room air and some of the girls are negative. We are rather short on flasks because there are times that Dr. Hess cannot always get the flasks back to the laboratory in time to clean them. At the present time we only have seven flasks on hand as three or four have been broken in transit. I would suggest that you order six or eight new ones so that we can watch and see what happens to them. Cordially yours, Findenik B. Thin Frederick B. Flinn FBF:GD