UAP Reported at Sandia Base, 1948-1950

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dbension oi" ,the o-rder o~ twnty or thirty .:nicrono.
There were no Br:lall partielee,
that 1e, no particles 11'1th n iruuiml1!11 di?DeXUiion below 15 microns. ,
J'ollmring tho :f'lrat colleotion, ,additional oolleotions 1f8re nade , tindor aimi•
1ar conditions. over a period of elght daya.
The aooco.pann,ng table su:n:iarisea the colld1t1ons and copper counts ror all
tbese collections , including tho first ono described above.
nU!!lbor of the ru.ru,
wero tor periods lor.,;or tfum three minutes, but °'he oouhts have, 1n 'tbeee cases,
been reduced to the threo-:nnuta equivalent.
Olio eolleetion showing oevora.l large
copper indications , tekon J"u~ 25, ia omm:1ttnd fron the to.blo because it was
damaged in courae ot a teai for radioaotivity by exx,osure of a nmlear track plate
(vrith negative reoultn) end a det"inita count oOllld not be made .
The counts are exhibited in tbreo size claeRiflcations, end attention is
directed to tlie :ta.at that particles in the smallest s!ze croup (l to l5 microns)
e::-e practically absent trom the early oollectlona, mil& in the later collectiow,,
particles 1n the largest (.30 mioron.o) 8Ii.d middle (15 to 30 microna} groups have
become cp;ite esoarce.
At the same tine, the counto have beccte quite large in tile
:.s:ncllest aizo group.
SIONIFICA~CE
OF
RESULTS
If 1 t were possible to SflY that particles giving a copper test are generally
very rare in eollectione near groimd leTel in this locaJ.lty, the above facts t'.Ould
bo highly s!gni1'1cant. It l1appens , however, that collections have been :-:,ode at
Socorro over only- a short period, and not .muoh e.tten1i1on has been given to !denti­
fica.tion ot copper coJ:lJ)ounds.
::aowever, after the copper indieetions had been round
in the present sories of: collectio•,s, some collections were round on file that hod
been made on plain glycertn-3aui.tin on july .1,, 1949.
-These r.are oovered ,nth the
Sarun fi-lm and rubeanic eoid C!Jld an::.on1a were appliod by d1 tfusion through tho ·ttlm.
A few copper indications were found, al!nost all the i:e.rtioles being in the 30 micron
size group.
Some other co11ection.s were made early 1n ~uly tbo.t will be e::lt8!ninod
tor· 'lopper when they are treed !"roe other tests.
lil add1 t1on, oce~ional colloot1ons
will be examined. tor copper in the futll!'e, and 1t may be possible eventually to add
so:neth1ng to tho information now presented.
COllCLUSION6
REGARDING
COPPER
In view Qt the above fa.eta , it i,eem:, very hazardous to draw any: definite con­
clusion associating ~he coppe~-bearioo perticlos collected with the fireball or 1uly
24. Th.are a till is, hwoTer, a residuum or poasitdlity ot such associations men 1 t
is conoidored th c.t partic!.ss ot 1hc smallest s1 ze group did not appear in largo
numbera until some 35 hours at'ter the po.esege of tl;le fireball.
NND 58378