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*F CA'JRIA MOPOSSIXLE PmmmkNTTION
ETRACER'CONFZECE AT THE UNIVERITY. OF CHICAGO
MALRC 3 AND 4, 1947
-yeof Manucript: Pebrtary 17. 1947_
Date Declassified: March 18. 1947
Thit doonwent 1ia for. offioial use.
Its issuance dots 42ot contitmte authority
vor deehasulfloation of classified copies
e'kor, hw-ame or similar content and title
ndby the same author(s).
Sooeument..as been aerdcdb iet photography
fiwwt cop as ou fdted to this office.
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IV, TU AA5UTAW UU W laZMUB Sr *M: U5AVASZBX V
March 3 and 4, 1947 / :
erials For the Atomic Enegy. CqOcAmmiion 7A.-.:;
BaC,03 from Ca(NO3 D.2i : .
A brief discussion of probable quality of this product frao t 'he
point of radiopurity and specific activity will be presentfd.a I
be pointed out that' te only radioisotopes produced in thbis. "'rE
tion (the source of C4 for the next several month) arm.*l ?
and Cl4. Ca45 is non-volatile and & 37 is not trapped by alkali
precipitated by Ba'. The C14 appears quantitatively as CM ab
thereore is volatilized, trapped in alkali, and precipitated ar::s
BaC#03. (No effort is being made at the moment to push the rqif.
and marketing of C0a5 due to its low specific activity.) JAr"; A
being distributed locked up in crystals of Ca salt.
The C34 produced from Ca(NOj) bombardment at Clinton Iabor g ieas
should have a specific activity of the order of 50-100 ya C-Jag 0];
(-1% C14/c1 ).
. B BaCq from Begig
The average over-all specific activity obtained if all f the C~4 .
irradiated BeN2 is converted to BaCO_ will be of the order of .,
pa Cl/g C. Of course the specific activity obtainable ia a fDbjI
of: (a) the samunt ofC12 present in the nitride oriL al; (ub.i
time of bombardment; and (o) the power level of the boMtr ,
These points will not be discussed further. '
The specific activity of alkali-volatile, acid volatile, aad 4n".:,i
volatile but oxidisable fractions will be presented if the w rk
completed in time.
Other C containing copmounds from Bega ,
Work is in progress to determine the distribution of C1 b.etwetld
various fractions and probable groups of fractions as follow. r. :I,
: .. E :.: 'A ,
1. Alkali volatile fraction (65% of total) ,.
a. CO ". .
*The actual value for specific activity is not yet available but ii1E?
out of current experiments. Y "..'
: N: on-o latile, oxidisable (30% of total)
Probably little If aay work will be done in attempting to identify
'' ithe comonents of this fraction by the tile of the meeting.
A For filtering and counting BaC3 0*
: A slurry of BaCO3 in Ba(GH)2 is run through a porcelain filter disk
h eld between two rubber gaskets. IThe disk ia aade by cutting off,
all but a few nilliastess of the top of a Selas filtering crucible.)
After rinsing with water and acetone, the apparatus is disassembled
i and the filter disk with its cake of carbonate is dried and weighed.
The disk is then mounted in a metal holder which fixes its position
S in a standard counter housing. Counting is done with a mioa-window
': .... tube (2.2 to 2.7 mxgWc2 window thickness). This counting is thick-
saple counting since sufficient carrier is added to give a BaCO3
precipitate of approximately 25 ugu/om2. Samples are then corrected
for self-absorption to a standard weight of 25 magW c2. This correc-
Stion is usually mall in magnitude and of course yields relative
:: rather than absolute counts.
A: vantages of this method are its speed and ease of operation. The
a:hief disadvantage is its lack of precision since the filter disks
are not standard in area, height of rim, angle of rim, etc. Counts
a on replicate samples agree within a few percent.
: B. OFa conStnuous nontorin of a ea stream aeontaini G C Go unmds
.. An ioniation chamber was iaerted as one unit in the gas train used
0 for studying the volatile C compounds which could be swept out of
*,3e2 ad Ca(NO )2 solutions. The dried gae stream was led directly
Ps .apparatus and its. operation is similar to that described by Henriques
O al-. Ind. ing. then., Anal. Ed. 8, 349, 1946.
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UNIVERSITY OF FLORIDA
III3 1262 0910713
3 1262 08910 9713
This apprasatus 3m usa sWat falir
aeration, in taylm g t*a-4Atfi
and In detecting dunexpmatu eal
1-7. J. R.
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9.- W. E.
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