Fission Track Ds Di Measurements In Artificial Glass Under Conditions Free From Fading And Radiation

We have checked the effect of the difference of energy between the spontaneous fission of the U-238 and the induced fission of the U-235 on the DS DI ratio (spontaneous to induced track size ratio) in artificial glass. The DS DI ratio was measured for different etching times. The results of the measurements indicate that for practical purposes DS DI can be taken as 1 under conditions free from fading and radiation. © 1991.5316770Storzer, Wagner, Correction of thermally lowered fission track ages of tektites (1969) Earth and Planetary Science Letters, 5, p. 463Storzer, Poupeau, (1973) C.R. Hebd. Seanc. Acad. Sci. (Paris), 276 D, p. 137Arias, Bigazzi, Bonadonna, (1981) Nuclear Tracks, 5, p. 129Miller, Wagner, (1981) Nuclear Tracks, 5, p. 147Bernardes, Hadler, Lattes, Osorio, Bigazzi, Bonadonna, César, (1986) Revista de Fisica Aplicada e Instrumentação, 1, p. 288Arias, Bernardes, Bigazzi, Bonadonna, Cesar, Hadler, Lattes, Radi, (1986) Ciência e Cultura, 38, p. 285Bernardes, Bigazzi, Bonadonna, Centamore, Lattes, Hadler, (1986) Nuclear Tracks, 12, p. 901A.M. Osorio, Master Thesis, Universidade Estadual de Campinas, SP, BrazilShukolyukov, Krylov, Tolstikhin, Ovchinnikova, (1965) Trans, from: Geokhimiya, 3, p. 291Bigazzi, Hadler, Osorio, (1988) Nuclear Tracks, 15, p. 707M.F. Cesar, personal communication (1986

Measurement Of Low And Stationary Flux Density Of Thermal Neutrons Using A Fission Track Technique

A new monitor suitable for measurements of low and stationary flux density of thermal neutrons was developed. Its working principles, calibration and characteristics are presented. © 1994.3501-2291295IAEA, Neutron Fluence Measurements (1970) Technical Report No. 107, , ViennaFleischer, Price, Walker, (1975) Nuclear Tracks in Solids: Principles and Applications, , University of California Press, BerkeleyDragu, (1991) Nucl. Tracks and Rad. Meas., 19, p. 461Ritchie, Eldridge, (1961) Nucl. Sci. Eng., 9, p. 198U.S. Atomic Energy Commission, Reactor Physics Constants (1958) Report ANL-5800, , Lemont, IllinoisBarkas, (1963) Nuclear Research Emulsions, , Part I, Academic Press, New Yorkde Carvalho, The Processing and Loading of Nuclear Emulsions (1965) Progress in Nuclear Techniques and Instrumentation, 1. , 3rd edition corrected, North Holland, AmsterdamHadler, (1982) Ph.D. Thesis, , 3rd edition corrected, Universidade Estadual de Campinas, Campinas, SP, BrazilHadler, Lattes, Marques, Marques, Serra, Bigazzi, (1981) Nucl. Tracks, 5 (1-2), p. 45Hadler, (1979) Master Thesis, , 3rd edition corrected, Universidade Estadual de Campinas, Campinas, SP, BrazilDemers, (1955) Ionographie, , Les Émulsions Nucléaire, Les Press Universitaires de Montréal, OttawaBethe, Askin, Passage of Radiation through Matter (1955) Nuclear Experimental Physics, 1. , E. Segrè, 3rd edition corrected, WileyFalleiros, (1994) Ph. D. Thesis, , 3rd edition corrected, Instituto de Pesquisas Energéticas e Nucleares/Universidade de São Paulo, São Paulo, BrazilWestcott, Effective cross-section values for well-moderated thermal reactor spectra (1960) Atomic Energy of Canada Limited, , 3rd edition corrected, AECL report 1101Holden, Holden, Rep. BNL-NCS-36865 (1985) presented at the 33rd IUPAC (Inter. UnionvPure Appl. Chem.) Gen. Assem., , LyonCowan, Adler, (1976) Geochim. Cosmochim. Acta, 40, p. 148

Spontaneous 238u Fission Half-life Measurements Based On Fission-track Techniques

In the last recommendation of the International Union of Pure and Applied Chemistry (LU.P.A.C.) on spontaneous fission half-lives for groundstate nuclides, a number of measurements of 238U based on fission-track techniques were discarded. The arguments given by the authors are not clear. In this work a more detailed discussion of these determinations is given, considering the possible systematical errors inherent in fission-track approaches.2561155157Holden, N.E., Hoffman, D.C., (2000) Pure Appl. Chem., 72, p. 1525Fleischer, R.L., Price, P.B., (1964) Phys. Rev., B133, p. 2975Liu, S.S., Zhang, F., (1991) Science in China, 34, p. 1120Storzer, D., (1970), Thesis, Universität HeidelbergWagner, G.A., Reimer, B.S., Faul, H., Van Den Linden, R., Gubels, R., (1975) Geochim. Cosmochim. Acta, 39, p. 1279Thiel, K., Herr, W., (1976) Earth Planet. Sci. Lett., 30, p. 50De Carvalho, H.G., Martins, J.B., Medeiros, E.L., Tavares, O.A.P., (1982) Nucl. Instr. Meth., 197, p. 417Roberts, J.H., Gold, R., Armani, R.J., (1968) Phys. Rev., 174, p. 1482Kleeman, J.D., Lovering, J.F., (1971) Geochim. Cosmochim. Acta, 35, p. 637Leme, M.P.T., Renner, C., Cattani, M., (1971) Nucl. Instr. Meth., 91, p. 577Khan, H.K., Durrani, S.A., (1973) Radiat. Effects, 17, p. 133Ivanov, K.N., Petrzhak, K.A., (1975) Sov. J. At. Energy, 36, p. 514Emma, V., Lo Nigro, S., (1975) Nucl. Instr. Meth., 128, p. 355Spaggiari, E.R.V., (1981) Ann. Acad. Brasil Cienc., 52, p. 437Baptista, Z.N.R., Mantovani, M.S.M., Ribeiro, F.B., (1981) Ann. Acad. Brasil Cienc., 53, p. 437Hadler, J.C.N., Latees, C.M.G., Marques, A., Marques, M.D.D., Serra, D.A.B., Bigazzi, G., (1981) Nucl. Tracks, 5, p. 46Vartanian, R., (1984) Helv. Phys. Acta, 57, p. 416Gentner, W., Storzer, D., Gijbels, R., Van Der Linden, R., (1972) Trans. Am. Nucl. Soc., 15, p. 125Green, P.F., Hurford, A.J., (1984) Nucl. Tracks, 9, p. 231Guedes, S., Hadler, J.C.N., Iunes, P.J., Paulo, S.R., Zúniga, G.A., (2000) J. Radioanal. Nucl. Chem., 245, p. 44

Fission Track Analysis Of Apatites From São Francisco Craton And Mesozoic Alcaline-carbonatite Complexes From Central And Southeastern Brazil

Thermal histories on seven Brazilian apatites were obtained by fission track analysis using Monte Carlo simulations. The apatites were collected from two distinct geotectonic provinces One group, originated from São Francisco craton, represents a typical cratonic domain with Proterozoic and Eopaleozoic rocks and yielded Permo-Triassic ages (counted since the instant when temperature was low enough so that the damage produced by fission tracks in apatite started to be preserved). The common thermal history accepted by all samples of this group is a linear cooling from ∼90 to ∼25°C for the last 240 Ma, in agreement with present day thermal gradient and denudation rates. The other group, from Mesozoic alkaline-carbonatite complexes, in central and southeastern Brazil, yielded Cretaceous ages, close to those of the intrusions. For the samples of central Brazil, fission track analysis suggests a slow cooling from ∼95° to ∼85°C between 90 and 60 Ma ago, followed by a faster cooling from ∼85° to ∼27°C for the last 60 Ma. Otherwise, two trends exist for the samples of southeastern Brazil. The primary one is an increase in temperature from ∼75° to ∼95°C, which occurred between 140 and 60 Ma ago. In this period, there is also another trend: a cooling from ∼100° to ∼80°C. However, both trends are followed by a common thermal history during the last 60 Ma: a cooling from approximately ∼80° to ∼25°C. © 1997 Elsevier Science Ltd.1003/04/15285294Amaral, G., Bushee, J., Cordani, U.G., Kawashita, K., Reynolds, J.H., Potassium-Argon ages of the alkaline rocks of southern Brazil (1967) Geochimica et Cosmochimica Acta, 31, pp. 117-142Amaral, G., Potassion-argon age studies on the Jacupiranga alkaline district, State of São Paulo, Brazil (1978) 1st International Symposium on Carbonatites, Poços de Caldas, pp. 297-302Arne, D.C., Green, P.F., Duddy, I.R., Thermochronologic constraints on the timing of Mississipi Valley - Type ore formation from apatite fission track analysis (1990) Nuclear Tracks and Radiation Measurements, 17, pp. 319-323Asinus, H.E., Porto, R., Classificação das bacias sedimentares brasileiras segundo a tectônica de placas (1972) Congresso Brasileiro de Geologia, 26 (2), pp. 67-90. , Proceedings of the 26th Geological Congress of the Brazilian Geological SocietyBrown, R.W., Green, P.F., Discussion on thermal and tectonic history of the East Midlands shelf (onshore UK) and surrounding regions assessed by apatite fission track analysis (1991) Journal of the Geological Society, London, 148, pp. 785-787Corrigan, J.D., Apatite fission track analysis of Oligocene strata in South Texas, U.S.A.: Testing annealing models (1993) Chemical Geology (Isotope Geoscience Section), 104, pp. 227-249Cowan, G.A., Adler, H.H., The variability of the natural abundance of U-235 (1976) Geochimica and Cosmochimica Acta, 40, pp. 1487-1490Duddy, I.R., Green, P.F., Laslett, G.M., Thermal annealing of fission tracks in apatite 3. Variable temperature behaviour (1988) Chemical Geology (Isotope Geoscience Section), 73, pp. 25-38Gallagher, K., Hawkesworth, C.J., Mantovani, M.S.M., The denudation history of the onshore continental of the SE Brazil inferred from apatite fission track data (1994) Journal of Geophysical Research, 99, pp. 18117-18145Gallagher, K., Hawkesworth, C.J., Mantovani, M.S.M., Denudation, fission track analysis and the long-therm of passive margin topography: Application to the southeast Brazilian margin (1995) Journal of South American Earth Sciences, 8, pp. 65-77Giegengack, R., Omar, G.I., Lutz, T.M., Johnson, K.R., Tectono-thermal history by fission-track analysis of the Bighom Basin and adjacent highlands, Montana-Wyoming (1990) Nuclear Tracks and Radiation Measurements, 17, pp. 412-413Gleadow, A.J.W., Duddy, I.R., Lovering, J.F., Fission track analysis: A new tool for the evaluation of thermal histories and hydrocarbon potencial (1983) APEA Journal, 23, pp. 93-102Green, P.F., The relationship between track shortening and fission track age reduction in apatite: Combined influence of inherent instability, annealing anisotropy, length bias and system calibration (1988) Earth and Planetary Science Letters, 89, pp. 335-352Green, P.F., Duddy, I.R., Gleadow, A.J.W., Tingate, P.R., Laslett, G.M., Thermal annealing of fission tracks in apatite, I. A qualitative description (1986) Chemical Geology (Isotope Geoscience Section), 59, pp. 237-253Green, P.F., Duddy, I.R., Laslett, G.M., Hegarty, K.A., Gleadow, A.J.W., Lovering, J.F., Thermal annealing of fission track in apatite 4. Quantitative modeling techniques and extension to geological timescales (1989) Chemical Geology (Isotope Geoscience Section), 79, pp. 155-182Hadler, N., Iunes, P.J., Oliveira, E.P., Osorio, A., Paulo, S.R., Tello, S., Thermal history of copper-bearing rocks from the Caraíba mine, Brazil: Preliminary results from fission track analysis (1993) Expanded Abstract of 3rd International Congress of the Brazilian Geophysical Society, 2, pp. 845-850. , J.C., A.M., C.AHadler, N., Iunes, P.J., Paulo, S.R., Tello, S., Obtainment of thermal histories for sets of geologically compatible localities by using apatite fission track analysis (1995) Revista Brasileira de Física Aplicada e Instrumentação, , J.C., C.AHamza, V.M., Frangipani, A., Becker, E.A., Mioto, J.A., (1989) Mapas Geotermais Do Brasil, , Relatório interno do Instituto de Pesquisas Tecnológicas, São Paulo, Brasil, IPT N. 27069Hannah, G.C., Wescott, C.H., Lemmel, H.D., Leonard, B.R., Revision of values for the 2200 m/s neutron constants for four fissile nuclides (1969) Atomic Energy Review, 7, pp. 3-92Hansen, K., Post-Orogenic tectonic and thermal history of a rifted continental margin: The Scoresby Sound area, East Greenland (1992) Tectonophysics, 216, pp. 309-326Jaffey, A.H., Flynn, K.F., Glendenin, L.E., Benttley, W.C., Essling, A.M., Precision measurements of the half-lives and specific activities of U-235 and U-238 (1971) Physical Review, 4, pp. 1889-1906Kamp, P.J.J., Green, P.F., Tippet, J.M., Tectonic architecture of the mountain front-foreland basin transition, South Island, New Zealand, assessed by fission track analysis (1992) Tectonics, 11, pp. 98-113Laslett, P.J.J., Kendall, W.S., Gleadow, A.J.W., Duddy, I.R., Bias in measurement of fission track length distributions (1982) Nuclear Tracks, 6, pp. 79-85Laslett, G.M., Green, P.F., Duddy, I.R., Gleadow, A.J.W., Thermal annealing of fission tracks in apatite 2. A quantitative analysis (1987) Chemical Geology (Isotope Geoscience Section), 65, pp. 1-13Lutz, T.M., Omar, G., An inverse method of modelling thermal histories from apatite fission-track data (1991) Earth and Planetary Science Letters, 104, pp. 181-195Machado D.L., Jr., (1991) Geologia e Aspectos Metalogenéticos Do Complexo Alcalino-carbonatítico de Catalão II (GO), , Master thesis, Universidade Estadual de Campinas. Campinas-SP, Brazil, 101pDe Mascarenhas, J.F., (1987) Mapa Geocronológico Do Estado Da Bahia, , SGRM, Estado da BahiaMontes-Lauar, C.R., (1993) Paleomagnetismo de Rochas Magmáticas Mesozóicas-cenozóicas Da Plataforma Sul-americana. Estudo Das Formações Anari (RO), Tapirapuã (MT), Da Ilha de São Sebastião (SP), Complexos Alcalino-carbonatíticos de Tapira (MG) e Salitre (MG) e Das Ilhas Do Arquipélago de Abrolhos (BA), , PhD thesis, Universidade de São Paulo, São Paulo-SP, BrazilMurphy, J.M., Bakke, A., Low temperature thermal history of the Gilmore Dame area, Fairbanks Muning District, Alaska (1993) Canadian Journal of Earth Sciences, 30, pp. 764-768Roberts, J.H., Gold, R., Armani, R.J., Spontaneous fission decay constant of U-238 (1968) Physical Review, 174, pp. 1482-1484Sonoki, I.K., Garda, G.M., Idades k/ar de rochas alcalinas do brasil meridional e paraguai oriental: Compilação e adaptação às novas constantes de decaimento (1988) Boletim IG-USP. Série Científica, 19, pp. 63-85Silva, A.B., Liberal, G.S., Grossi Sad, J.H., Issa Filho, A., Rodrigues, C.S., Riffel, B.F., Geologia e petrologia do complexo angico dos dias (bahia, brasil), uma associação carbonatítica precambriana (1988) Geochimica Brasiliensis, 2 (1), pp. 81-108Vignol-Lelarge, M.L.M., Soliani E., Jr., Poupeau, G., Datação pelos traços de fissão do domimo meridional da serra do mar (arco de ponta grossa - Brasil) (1994) Congresso Brasileiro de Geologia, 38 (2), pp. 379-380. , Expanded Abstract of 38th Congress of the Brazilian Geological SocietyWagner, G., Van Den Haute, P., (1992) Fission Track Dating, , Kluwer Academic Publishers, Dordrecht, The Netherlands, 285