Document 3NZqGyOZmkOvY97Vwv8ENXe8D
us of Human Umd Inhalation iispQ^tsam.t as of February 19%
nubfact I who-
two years {? hours/day)
In the chamber xpoe4 to0?*> ng/ load seaquioxi&e* *0$
micron median diameter* has now boon out of this chamber a
little over 1 year* owing which t*..Xn he ha continued
under observation* except for a short vaction^-tasSMBU It
appears that ho has oxcretod the load which !iM boon
accumulated dtsrtng bis exposure* but it is necessary to
follow hi intake of- lead .In- food and beverages end Ms
output 1st the feces end urine for sees additional months
'.ofor thi can bo established unocuivocaH:/
-'.subject IX
is still in tha chamber end so
far has boost eapesed C? Xioura/day) for XI? years to 15> mg/.'
lead seseuioxldS .05 micron median dismetor* It is
oppft rent that he has almost* cut perhaps not -quite, roeclied
on fjuilibrim with respect to his intake end output of
load* ?>t a point where the total quantity of load retained
in Ms body during the aqperixKmt is $sst obeut twice that
retained by Subject X during the a&m opprexiaato period
of time* i
bom montlis of additional tine in ihe chamber will bo ncooeoary to establish the facts with rlepeot to till
o"uilibrim*
'
Further PxporirKmfcg
Plans are being mode* equipment .1 being oscaaabXod*
end preliminary tests re in pva-$riv&m to provide a
controllable eononfcrntiatt of lead aeslbS of larger
rsadian sii'Q than 2tcs heretofore been used in is?
xporimenfc* It is possible that this oxperimnfc can
be carried out under conditions Which sisjalsfce mro
nearly the physical (and ohoaicel) state of the lead
in the exhaust of the automobile* not tljat remise to
bo soon*
A further exporinont# will call for a suitable
oxperistan&al aub^eet* 2t has been believed until very
rocontly that Subject X could be need ggain in this
axporlmsnfc* St- in possible that this my bo found to
bo imdoelr&ble* If this is no deoided# a e w subject
will bo found and used In prollninary observations in
preparation .for this experiaenfc* The preliiairiapy abe or
rations will not mod to bo <n to a 0 tuxtensive HTstl pro*
longed es those carried out iJ the
b two o?cper&ment
In any case* no prolonged del* - wil.1 bo involvod, cine
the observations on both SubJ*
.4*
'V
T
<
and ftxb^oet
II will
bo continued for sosae months longer*
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