Utu Sg $Em 3353113 1 12 0 1 OF 33 11 va firmly 5mmfar r' 4 himif 25DECLASSIFIED A A E of 11652 SeeSeatembar 29 1949 OSD letnez April 12 1 974 Br mag mus am 72 DECLASSEFEED E 0 11552 Sec 3 5 3316 5a E C3313 fairer Aprii 12 E974 8 diolagical e eatibn of 9 large qaa ti iea of radiaae iva material bagan an ha thir of ayismber an 3 5 tiaued sevgrallw eks'thereafter $316 earliest ii e af dategticn as well'as 30mg subsequant timas the radieac i a claa gnaa backt aaka in tima g he 29 3 28th aad 27th 0f August 1gza j neaa da es hr akat the mast graha lg timaayef nrigia -iny eieqralmgieal Widamaaxm used ts aawrtam 901nm cf sri 1 thuwa aigna ed imes v D f ggy AEALXSIE Tim lm fag its that m mc aive material mm 1 at a preaauze altitu e f 530 millihara It i poaaible t a ke material filtered fram tha air a% 503 ab was par- tiaulata mattgr falling frag much graatermal itudea af rming a ii farent tmjaatery from Ma materials mb Early resul s particle aims maasurementg suggaat that the particle iameters are extremely amall so t at falluout is nagligihl comparad ta vart cal motions asaaciate ith fall out aagaat cf hs grablem is therefore act eanai ered in hia'rayart only trajec oriea ar iscu aadg V4 C st t pressure ahar a at 5 3 mb ontaini g all available upparV air obaervaticas were grepare for wa times eaah day ever the required portian of the henisp era Also wherever dgta all ether times of the ayiwer used ll peesible acureea of data were ei a ate far informatian but mg y ga thgr raawr fw r xv aw 233% received prasum bly baggage 3f talet'pe failure and hae nap bee abtain d by mail in time iuaorporatiaa i hia_report F3 42 Since ha wind abservationa are inaufficien ta Shaw apee s 8% all painis alsng the rajaetcries it bacam a ta the gaQ straphic wind campu ed fram the pregaura fiel aa the hast appruximutinh 7 ts the true wind It is well known that he wind is at times 2 a aypr ximatien to the'actual Wind giving results a much as 25% in_arror For this reagen trajectories basa an 25% less than and 25% graatar han the geostrap ic gind were camputa t0 give he minimum 356 'maximan air-tranaport The trajec czy tachnique fbllaws that dasqribed in Pet ar se 'a taz boak geathar Analyais an Faracasting an con ains the mast wor w - While refinements caasisiant with t e quality 0f the vsa her in general fig meteorological situation uring the period invafved' in this report is sf very littla mc ememt d ch nga of wind pattarna Th8 irsatien of the wind in ganeral wwai33d quiie consta t_wi $ hsight ahova 50% ab bat the speed iacrease iwith altituds flat pattern tands ts give mare reliable trajectcrias t53n a the tragec metho use a A 5 1 1 43 1 - DECLASSWED E 0 11652 Sec we 5H3 or 933' m Eta 1 05D tenet April 12 3974 - $3 555 NARS Desi es aw the the game hf the that imports eateatiee ts the atheism free the flier-t ez e he the thigh hf hastening Since the filter reehiahe 123 aperitihn for threat hears the lag sheathing the positiae eetaetihe meanest far that W38 metiahl miles It is has 1 tibia time the ight metatarae eeriistatieith all slash the leg but it it that likely that the activity the hammer th a stellar segeeht hesitates the armies shes intense frhe the teeth hi the mile leg hither math fhe that h hambaihe is the steam at tetivitsr he latte hf the single Lag were wheetarea the material Entirely tiffheaet m3ahtarlea are ahteieah ba athrtiag at eif eeae mi th' alhre the 7 'th' these reheare the 796 mile its is ethiehei into met Eerie area peiet hf that rare that he the bh gineiae eerie-t tsektmaii ha fell-ewes Z We The eiepaiet of the hesitate r313 hi the patitive 133 was ahiaated at 54613 1 0033 The trageatary emigrated beeheer e in hm huggeret the thigh ta be he- these 335% the 8932- the 130% if the here that 4 194 Ehieezsaa preheatac It at 3 113 he that this mjeettry it the eff 27 81 1 the this With it re ected 3 13 the let prabaaility 1 assigned ta tide areaErie hem hf the th the the enmity hf heats Wad in this twitches-y mt he more teatime tweeter a the arisie peter heather shims gives this 0 wheel Mamet-seq WtJWae the 976 1 is has the whitihe a this peat is - 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a1 233 111 mt 1 1 1 E- Mr a i 3 he 2 13 le Aw 11 if m rm fur 1 gmLinger 73110 4 335Vu r OJ M9113 I mmwm mum- This document is from the holdings of The National Security Archive Suite 701 Gelman Library The George Washington University 2130 H Street NW Washington D C 20037 Phone 202 994-7000 Fax 202 994-7005 nsarchiv@gwu edu