410578 Dr. P. KH. Wreko?F, Chief Atmospheric Ph.sica Laboratory of the eo-hysics Research “frectornte Air Force Cemoridce Research Center 8 COMPI it Location, Collection Records Coster C- 2% D-99 wi Boston, Kassschusetts Folder (poe aifer Studies In necordence with the request of Dr, Lester Machta, U. 3, Westher Bureau. and the inatrvet{one of the Sivieion of Militery Applications,U. S. Atomic Enercy Commission. I em forvarding ts you Sum les of detris from seversl bombs of the Operation CASTLE | #5 ‘the debris is canteined on filter paners which vere flows through the tem) elow@, Pertinent dete on times and altitudes of collection are given belov, In regard to the removal of perticuleate matter from the filter repvers, members of the Argonne National Laboratory have performed this operation successfully by shaking the papers with smil steel balls in scetone. Tetails of this procedure may be odtained from Ur, Shermen Fried of Argonne. In regnrd to the perticulete size distribution, studies have been mde on similur pepers by members of the AFOA al organization. Tetails and results msy be obtained from Or. Willfar Urry of AFOATel. Ine level of radionctivity on the papers at this time is in all eos28 lsss thon 3 milliroentgens per hour et resr contact. Upon come pletion of your studies, the filter papers need not be returned to L:s Alamos; however, certificates of destruction of the asterial should be furnished to me at your conventence, For your {nforagstion, details on the nature 9% the debris collected on these papers earry a claseifte cation of SECRET RES RIC TED DATA, and fsll into the "Weapons Deta™ extegory. CLASSIFICATION CANCELLED loc WITH DELETIONS ae! o BY AUTHORITY OF D ‘COPIED/DOE LANL RC - bever 3} — Menr “er, Wreko?f Series. -C ny eet,tePPP a wasl¥3 gest COPY AVAILABLE L15 Somme-s Street BY./ CMe / Dd BY AUTHORITY ERET. RD. TLL: Sen eeeGvuec eeehiara, Je11-126