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 ‘ .