the unomposed populations by 2 years.
The time course of neutrophil count changes
foliowed clescly that of the total white count.
Lyapkocyte depressioa was early
and profound (fig. 9) with craducl retucn tewaecd nozmal.
that of the umemposed groups as 3 years.
The counts remained below
The ‘platelet count reached a low at
approzinately 4 weeks (fig. 10) with faisly rapid initial recovery follLowed by a
seconcary depression and slow return towards noemal.
platcliet counts were
At three years the moan
stiii slishtiy celow the mean of the unexpoced populaticn.
Tanz hematocrits at no tine wore remeochably different from the unexposed levels.
As the tines of peak depression, some individuals had neutrophil counts belew
CS0/am> and pistelet counts. beloy 75,000fan.
No infections attributable to the
neutzopenia were observed, however, ond an epidemic of upper sespirctozy Iintectica
at eppromimately the time cf maximum neutrophil depression was cquaiiy
scavily and mildly exposed groups.
the platelet depression.
severe in the
No hemorzshacic phenomena could be attributed to
Ail individuals were ambulatory throughout, and no therapy
Cother than for the skin Lesicns) beyond that routinely required for any lazge
groups of individuals was necessasy or administered becouse of the
radiation expos-
ure.
The £3indings aticu accurate documentation of the response of the huran being
to total-body gamma exposure in the bish subicthal ranse, not possible in the
Japanese
exposed
at Hiroshima and Nesecsati.
aspects from that scen in nm
Inborstory animals,
early rise, vith only minimel Acvering
The total white count shows aa
mtit masimum depression occurs at apnromd-
A simiZas trend is secon with tha neutrophil count.
ymohocytes is carly and severe.
oO
mately 6 wees.
The time course differs in important
The droy in
The platelet count fatis in a secuins fashion,
seaching a Low at approwinately 53
days.
The rate of recovery is considerably
siewer
than would be anticipated fren laboratory animal data and is incempicte at
wm
3 years.
These findings ore consistent with the incomplete data available on the