mt 4 ¥ This document conat..ts of<pages No / of 2% jppies cie/as/pr 17 January 1947 —EGESECRET eu pony = Letter to Doctor Wright Langham (Cont'd) We ere also trying to calculate the absorption of slow neutrons by steel. Do you know of any data at Los Alemos which would help us out in this respect? Unfortunately, our experimental data from the pills placed around the various ships is not too satisfactory because of the tremendous scattering of the slow neutrons and the consequent difficulty in measuring the thickness of the steel shielding. Some tirie ago we wrote to Doctor Holloway te see if any of the data obtained by Linenberger and Ogle could be used to obtain neutron flux, but as yet have had no reply. I also wondered if you had succeeded in getting Dessauer's neutron films calibrated. The more data we can collect the better chance we will have of coming out with at least a reasonably accurate answer. i hope this sudden onslaught wont completely snow you under, but we are desperately trying to tie up some of our loose ends before the powers that be make their decisions. Sincerely yours, fete. secant Herbert Scoville, jr Encls: 1 graph, Top Secret, 1 page App XIII, 8 pages, Neutron Dosaze from Sulphur and Phosphate Pills. UNCLASSIFIED