wrre done with @ Za8 (Ag) crystal and a silicon warfece-barrier
detector, reapectively Six Aeerage
Pb
oe were analyred,
renaing from very old Pb with a negligible
ently
factured lead
tp to 9100
heig PD 1t was also found thet 2 cupferron ligneds
in the Po-cupderron complex, (BBE
ations,
28740
DETERMINATION OF FISSION PRODUCTS BY A
RADIOCHEMICAL PROCEDURE. Cornelia, Rita (Rifkeuniveraitett, Ghent, Belg.) Meded, Vieam, Chem. Ver., $0: 6-17
Wan.-Feb, 1968), fn Flemish),
An analytical technique was developed to determine fong-:“lived
ing fisaion producta
of U.
ta e
of a sodium
melt of ‘the Naston ‘product ition or the U fuel, fallowed by
Ifquid-Hyufd extractions, Then the isotopes are counted with @
standardized 3 < J in. Nal cryeta!. The total y spectrum of the
original fisafag product solution, determined with a Nal crystal
or a Ge-Ul detectry 1s also analyzed mathematically by mixed y
spectrometry. From a bricf postirradiation of the fleston product
solution the concentrations of both ™4p and ™U are determined.
tration
the calculation of the percent atomic burnup, the
trradiation
ooling perlod, Mux of the reactor, and original
degree of enrtchi
the U (BBB)
za7al
DETECTION LIMIT FOR SILVER BY ENERGY -DISPERSION X-RAY ANALYSIS USING RADIOISOTOPES, Burthalter, P,G, (Bureau of Minea, Collage Park, M4). Int, J.
AppL Radiat. Inotop., 20: 953-62(May 196%.
The purpose of the ehaty described was to determine the aensitivity for atlver in atitca aeing radloisotopic x-ray sources, electronte discrimination with a single-channel
1
. and
tion detectors. The seasitivity for silver wag determined aan
function of excitation energy. Using monoenergotic K-spectra
x-ray sources of 8d, Te, and Ba, « normalized detection limit
ranging from 21 to 13 ppM was obtained for 100-sec counting tntervale. With an anouler '1 pource a detection Hmit of 15 ppM
silver was measured. The effect on the detection limit of heavy
metals common to silver ores was also investigated. A detection
limit of 25 ppM or lese was still obtained when 5% coucentrations
were present in the silica matrix provided x-rey interferences
with the Ag Ko radiation did not extat. The need for accurate beck~
gtound measurements for analysis in the parta-per-milllon range
te emphasized. The sensitivities found indicate that a portable
radiolactopte x-ray analyzer could be designed for low-grade
silver ores (muth) (UK)
28742
ANALYSIS OF ATMOSPHERIC CONCENTRATIONS
OF Red, RaB, AND ReC BY ALPHA SPECTROSCOPY, Marts,
Dowell E.; Holleman, Den F.; McCurdy, David E.; Schiager,
Keith J, (Colorado State Univ,, Fort Collin). Health Phys.,
17:
19Y-8(July 1969,
A new method la presentcd for deterraining the airborne concentrations of *Po, *Pb and ' BE in atmospheres contaminated
withRn. The method employs alpha spectroscopy to measure
the count rates of ’''Po ard 74Po present on a membranefilter
sample at two post-sampiing Umea. The individual alr concentrations and the atatietical variances aasor lated with each may
then be calculated from the equations given. Theorotical and ex-
perimental compartecas are presented which indicate the {mproved accuracy of the spectroscopic method over methods previously available. (auth) (UK)
Activation Procedures
Refer also to abstract 28957.
28743
URRI-TR-87} APPLICATION OP ACTIVATION
ANALYSIS TO BIOLOGICAL SAMPLES, Shigematsu, Tamenobu;
Iwata, Shiro Myoto Univ. Pepan). Research Reactor Inst}, fnd).
9%. Ga Japanese), Dep.
dapan tas lagged In the fieid of anc(vation analyaia partly be~
cause of the lack of facilities in the past. There is graat need to
train people tn the application of activation amlysis in medical
and biological areas. A special commities on activation analyate
was created by KURRI (Kyoto Univeraity Reector Inetitute) in
April 1966 to define problets areas and to provide researchers
with pertinent information concerniog the application of activation
apalyate to medicine and blology. The aubjects corered inchade:
preparation of bial
1
samples
for trace
analy
pretrestment of biologion| materiale; pretreat ment procedures,
mample olection and preparation; gtandarde tu be werd in the
activation analy mia of biological m. teriale; irradiation techmqueay
chee al separation techaiques tavotred in the trece analysie of
+
Vol. 23, Ne. 15
NUCLEAR SCIENCE ABSTRACTS
og arpa cling, quastilative ahelyaig by Gemma spectre metry;
«ot
esafore Craton analyete: apalicattons uf activation
arlyeis to medicine; senattivity obtainable with the JRE-2 for
activation abalysis, (TTT)
75744
@TO-3624-3) TERRESTRIAL OCCURRENCE AND
DISTRIBUTION OF 2, Edwards, Raymond R. (CarnegieMolloa
Pitteburgh, Pa. Dept. of Chemistry). {1987}. Coatract ATQ@0-.2-364, 3p. Dep. CFSTI.
The coourrence of the long-lived
(half-life 1.6 x 10’ years)
in natural materials, expected from spontantous and induced
flaaton of uranium, and from cosmic-ray Interaction with the
atmosphere, meteorites, and similarly exposed materials, and
the somewhatlarger quantities introduced into the en iroament
through atomic energy activities was explored. This was feasible
because of the extreme sensitivity of sotivation analysis as a
means of detection and assay of this mclide. Developmentof the
aspay rechalquen.and thelr application to the etudy of fodine (in
"YY. ecology, and g:
logy) are di
Mea~
surementof the ™ activation prodact fn fodine obtained froma
{
Pleletooene (<13 My) brines and from Chileagcaliche fudicated
a ratio of "1/171 2 5 x 107"for theese geologically young ma-
terials, in essential agreement with bypothetical eatimsize. A
sample of iodine from a mach older (>300 My) brine gave the
anticlpated negative reealt. A large number of additional biological
add mineral specimens were prepared for the activation analysis.
(auth)
20748
(THAS.~ARC-11) NEUTRON ACTIVATION ANALYSIS
OF GOLD IN TEAK (TECTONA GRAMDES). (Oifice af Atomic Eaergy for Peace, Banghch (Thallaad)), 1968. 4p. Dep.
The amount of gold in teak was determined by using a neutron
activation technique. The neutros flux utilized was of the order
of 10" n/em'/sec. The spectram of the exergy peak of guid was
fed using a gi
ry
ittchannel pulee height snalyrer.
The sensitivity for gold was approximately 107'g. In teak Na,
As, Cu, Mn, and La were interfering elements In the energy
region from 6.4 to 0.8 MeV. Nondestractive analysia was rot
possible and radiochemical separation was essential. The gold
content of teak was 0.86 2 0.0037 poM. (auth)
zs7ds
{(THAI,-AEC-22) DETERMINATION OF MANGA-
NESE, COPPER, ZINC, IRON, AND MOLYBDENUM IN ANIMAL
BLOOD SAMPLE BY NEUTRON ACTIVATION ANALYSIS.
Chamnirokasarnt, Darakarnt (Office of Atomic Energy for
Peace, Bangkok (Thailand). 1969. §p. Dep.
The technique of neutron activation analysis wae applied to
determination of Mn, Ou, Zn, Fe, and Mo to animal blood samplea
as eupplled by IAFA for intercomparison purposes. One gram
of the sample wae found to contain 0.3786 + 0.0019 ug Moe1a
1.4146 &
9.0025 ug Cu, 16.8713 & 0.0807 yg Zn, 2.7025 + 0.0448 mg Fe, and
0.0305 + 0.0013 sg Mo. (auth)
28747
NEUTRON ACTIVATION ANALYSIS OF ALMOST
ANY OLD THING. Gordus, Adon A, (Univ. of Michigan, Ann
Arbor), Contract AT(12-1)-912. Chemistry, 41: 8-15(May
1968}. (COO-912-13.
The use of neutron activation analysis for determining elemente in minerals, coins, and paint pigments ta discussed.
Reaults were of use in determLning the source of obsidian used
by the Hopewell *ndians, the average siiver content fn medieval
Islamic coine, and the authenticity of a painting. (D.H.M.)
29748
INSTRUMENTAL ANALYSIS OF NEUTRON IRRA-
TAATED SOILS. Kline, J. R.; Brar, 8.8, (Argonne Nations)
Lab,, DL),
1969).
Soil Sol. Soc, Amebr., Proc., $$: 334-8Mar.-Apr.
Soils from a worldwide collection were analysed by gamma
spectrometry, after thermal neutron activation, to identify and
measure trace elements in actls which can be etudied by this
technique, and to determ!ne whether gamma spectra of soils can
be used to identify specimens of soll and trace them to thetr geographical origin. Samples of 100-mg size were (rradiated for
either § or {0 min tn the Argonne CP-8 reactor at a thermal neutroa flux of 2 = 10" o/cm?/eec., Gamma spectrometry of activated
-lived molides, which oould be observed afte
are "La, “ge, "Br, “ye, “Cr, MCo, "Ex, tte,
‘gen, Ht, andPze-Mi
Nb. Qusatitative determinations wers.
exetly made by nomdwctructtve methods for La, 8c, Fe, Co, Eu,
and 8m. Amounts uf Se were correlated with umounta of Fe, Co,
poeta
pentbat amar thanhe Barly Stadler correlations were
tb
dwith Le El
tf
resulted
twoimtlar gemma epectre for acits of dissimilar origin. Theee
therefore, rateed daghts ae to whether they could be used
without other sepporting evideece to ideetify acil specimens or
trace therm to thetr place of origin whew the smatygle is dons with
Ral crvwtale envi 400-charned aenipeets. (auth)
«
2926