1286
A short review Is given of the sources of the secondary particles
and of the advantages and disadvantages of the activation by secendary reactions A method was developed for the determination of
fig inh yar
by the
"O(p,n)!F induced by recoil protons, The reaction hate ‘LiteHt,
14O(t,n)'"F was made the basts of a method of detection of Lithia
in 0 variety of substances and of detection of oxygen in metal—
organic compounds, organic solvents, and monomers. it is also
shown that the matrix-effect, which appears in activation
with secondary reactions, can be compensated in most cares by
calculated factors containing the different ranges of the charged
particles and the different atomic densities of sample and
{auth)
92321
DET. “{INATION OF BIOSPHERIC LEVELS OF
1%) BY NEUTRON
Pitteburgh),
CTIVATION ANALYSIS,
Kelech, B.: Kook,
(Nuclear Sofence and Engineering
pp 284-90 of Proceedings of 1965 Interasticenl
Conference on Modern Trends in Activation Anslysia, College
Station, Tex,, Texas A and M Univ,, 1965,
Since y is formed in atmospberic nuclear detoastions, in-
creases in ite concentrations in environmental and biological matrices would be expected following world-wide deposition of debria
from these detonations. Its concentrations In thyroid tissues nad
related commercial preparations were selected to serve a8 an
index of the biospheric levels of . Ap array of several bundred
samples was studied. The general experimental method involved
preirradiation purification of the fodipe fraction of the sample as
well a8 poatirradiation rediochemical purification operations. A
beta = gamma coincidence counter wae ased. Several siguificast
modifications were incorporated in the detector —instrumentation
system and in the exper{mental procedures, which resulted in in-
creased amlytical sensitivity and accuracy, ™ levels were determined in thyroid tlesues from subjects spanning the entire age
group(
of the
Vol. 21, No. 8
NUCLEAR SCIENCE ABSTRACTS
Activationanalysis of magnestis axing the ¥S-nain Mg ie
deocrihed. The method can be sucoweatl
1 ee elec
cal sample, giving
resulte wi
afew
asia toed, Oe
drinking water, urise, and beef
Heewe. (mth)
12334
USE OF NEUTRONACTIVATION ANALYSIS TO
DETERMINE BIOLOGICAL A
SOILS AND
ANALYSIS OF SOILS,
Kitae, J. B.; Brar, 5, 8.4 Guetaison, P, ¥.; Huet, RH.
goune Natioeal
in
QL Univ. of
tAr-
Peal). pp 319-
Analysis, College Station, Tex,, Texas A
and M Untv., 1968.
Methods were
és
of various
1
traction of copper al suplen Wy 5 teh prsenalag chai,
which allows the callection of a reasonable body of information in
acplneasenttoes intervals. information, which
of these
of the kiica and amounts of copper released frum several soils. Other
obtained include that
larities of the spectra suggest
quinma apectre of peutronirradisiedsalle for idectification of
soils or the tracing of specimens to their origin. {auth}
12328
NEUTRON ACTIVATION ANALYSIS FOR PLUTO-
ic to geristric). A statistically significant variation
it ratio with age was obeerved in recently collected
samples (1962 to 1964) from young subjects. The ratio was largest
in pediatric tissues and decreased by about a factor of four with
age through sdol:
and early
‘bs
ln more
age groupe
OE ee eeeet aoe toners
Fleishman, D, pp 334-6 of Proceadings of 1965
Trends in Activation Amiysis.
on
Station, Tax., Texas A and M Unty., 1965.
College
(1,48 # 0.40) x 10°". These eamplea were collected in
Pennsylvania, and New York City. No significant geographical or
temporal differences were obverved, However, studies of biological
material collected at various times since 1946 at various
revealed a cistinct temporal behavior for the "1/1"! ratio. The
samples coilected from approximately 1949 to 1952 exhibited maximam valuea that exceeded current values by more than two orders
of magnitude. The predicted value (1074) for the preatomic era
1/127] ratio was not detected, but analysis of pre-1945 fodinebearing chemical compounds established a value of ~3 x 1071?
for the ratio. This value corresponds closely to the expected
limit imposed on the method of analysis by
ture in 1] quring neutron activation. (auth)
1965 International Conference on Modern Trends in Activation
groupe, was studied. The advantage of this method was that the
sample can be dissolved tn a hydrofluoric -nitric median. srosding
the principal disadrantages of the use of hydrofluoric avid.
determination of sulfur and phosphorus are possible th the o
tematic analysis. The syetematic saslysis of aluminum was imProved at different points. One of the resulta af the atady of the
cpalyaie of copper was the development of «scheme of separstions
that
of
taining 0.2% =f). The samples were collected on horizontal,
level
Analysis, College Station, Tex., Texas A and M Univ., 1968,
The systematic analysis of copper waa developed ucing separations by electrolysie under controlled potential. The determination
of sulfur was performed by different methods, depending on the
relative concentration of this clement and the phosphorus content
in the copper samples. A great number of analyses were performed
by thie method on aamplee, and the total impurity oonceotrations
which were determined varied from 0.6 to 28 ppM. A method of
ayatematic analysie of ziroontum, based on the initial separations
by fon exchange with an anion resia of the impurities tn eight
of the
d by high exp!
suclear weapons containing ‘plutoniam and depleted uranium (conP
12322
NEW DEVELOPMENTS IN THE SYSTEMATIC ANALYSIS OP HIGH PURITY METALS AND ESPECIALLY OF ALUMINUM, COPPER AND ZIRCONIUM, Albert, P.; Cuypers, M.;
Lesbats, A.; Mignoosin, E, (Centre d’Etudes ‘de Chimie Metallurgique, CNRS, Vitry, France). pp 310-16 of Proceedings of
of the radi
for chemical separations and for alpha counting. It also eliminates
the need to know the age and composition of the original pource
of plutonium or to have a reference sample of it. The neutron ectivation procedure
was devel
lyxe
for pl
in samples of particulate fallout material Geposited from duat ctoude
i
coated, 16 a ft
from the di
1
es located at ground
of particles of plutonium and depleted urantum from the device,
mixed with desert soil, which itself had a background of
urantum {containing 0.72% *) but no plutonium. Essentially the
method consisted of determining the intensity of the 105-keV photoponk of 2.33-daySpthe 1-40-MaV
photopesk of 40.2-hr Ly
. aad
is pre-ashot desert background eclls. The major raticactive feotopes produced in the eof] matetx ofthe fallout eamples of neutron
irradiation wore 2.3-min Al, 8.7~mia “Ca, 3.86-br "Mn and 18-
br “Na. Of these, only “Na made a significant
gaming radiation rate st 2 to 6 days. After
nificant gamma radiation from soll, except
Photopeaks only at 1.97-MeV and 3.7-MeV;
ute significantly to the isteusitiea of either
to the
§ dayw there was so sigfrom « 2ntum. “Na has
thus, it did not contribthe 105-keV or the 1.6-
MeV photopeaks. (D.H.M.)
12826
ELECTRON ACTIVATION ANALYS® FOR THE DE-
TERMINATION OF CARBON IN St
on Modern Treads ia Activation Analysia.
Station, Tex, Texan A and M Univ,, 1068,
College
am
acid medium. These separations are Row weed ona routine bnske
in the systematic analynie of ahugtvnm, iron, and sircomhem. teeth)
12323
SIMPLE AND RAPID MAGNESIUM DETERMINATION
TN BIOLOGICAL SAMPLES BY NEUTRON ACTIVATION ANAL~
YST. Kim, Chong K.; Metobe, W. Wayne (Ustv, of Michigaa,
Asn Arbor). pp 318-168 of Proceedings of 1965 latermetions]
Cunfcrance on Modere Treads tn Activation Analysis, College
Station, Tax,, Texas A and M Unty., 1988,
32327
ACTIVATION WITH PHOTONS OR CHARGED PARTOCLES FOR THE ANALYSB OF NONMETALLIC KLE MENTS.
Rageimase, C.; Cabent, G, (CEM, Sacksy, France). pp 331-4
‘
.