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ee by
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John C,. Bugher, ¥, De, ‘Thrector
. Division of Blology and Medicine
ma
May h, 1954
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_Gordon ¥ Punning, Tealth Thysictsat |
“Blophystes Branch, Division of atology and Meateine -
410210
“PATA ON SOTL SAMPLESCOLLECTED ON ‘DHS ISLANDS OF THE PACIFIC FOLLOYING THE FIRST DETONATION AND ALSO THE DOSE PATE READINGS AT THE |
SAKE LOCALITIES,
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‘ef the Facific following the first detonation and also the dose rate
Cne method of evaluating such data
io readings at the sane localitics,
is to try to establish relationships betxeen diffcrent units if pos-
sible, One useful relationship vould te tha couversion of disinteeratons per minute per cram of 3241 to nilliroentgens per hour of.
“ganza radiation at a threc-foot heignt or vice versa,
. Tarsonta’ wore with soll ‘around HFG during Be spring 1983 tests
indicated the following relations*ips
AC,/sq.fte teta counts of
soil (after cbsorption and georetry sonreditons} — 1 nre/fhrgarca-
Sp at 3 feet, Ma found that essentially all
a
of he activi ty 3za3 in the
q a first, one inch of top soil.
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ae
Yaa
x
7 Y In collecting soil on“the Facifie Islands good care was taken to
~-—collect one square foot of surface (in fact, texpicts wore race for
tis purposo), It vag impossible, however, to scoop up the soil to
|,
tf
a unifora depth so the rule folloved waz to collect to one inch or
.
~
greater, If the fallout activity in the Facific Islands also vas "|.
contained in the first one inch, the additional soil below this
,
contributed rasa but little activity to tha sample,
By taking tho
E
a
cisintecratioas per sinute per gran (after a thorough oixine) and
multiplying by the total nuzberof grazs for each8aple one Should
arrive at the activity per square foot,
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3/26/9
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BY AUTHORITY OF JOE 5¢5
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t. Attached (Annex I) are cata on soil 3amples collected on the islands
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;BEST COPY. AVAILABLE.
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_ The plot of beta disintegrations per ctnute per gran of soil versus
orfar of canna at 3 fcebt is shorn on the attached graph. Tio corrélation is not too good. For references, Scveral curves are arbitrar~
dly dravm on the grarh,
The data stronzly siggest that less than
10 xe/sq, ft. 13 equivalent to 1 ar/hre
For lover levels of activity
thé data are more of the order of 2 pelsq. ft,——> 1 nrfhr and for
higher levels of activity less than/1L ne/sq.ft-——> lrrfhr.
If
ona is’stot fled. in trying to fit a cirve to such widely scattered ©
_éata, thea 1b pc/ed.ft~-——y l rrfir is a very reuch approxizations
“another” possibild ty but not probability is.@ more corplex curve son
ty te.Seoud black,Uneesrs. 4
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