Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Raymond L. Walker"'
Publikováno v:
International Journal of Environmental Analytical Chemistry. 8:241-248
From the onset of the Three-Mile Island reactor incident (March 28, 1979), the distinct possibility existed that actinide and fission product pollutants could escape into the surrounding environment. Experienced analytical chemists in command of tech
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80d7503ecbd952864e6ef10cc525abdd
https://doi.org/10.1080/03067318008071893
https://doi.org/10.1080/03067318008071893
Publikováno v:
Geochimica et Cosmochimica Acta. 39:1211-1218
Because stalagmites are enriched in 234U beyond the equilibrium value at the time of deposition, they are potentially datable by measuring their progress toward equilibrium. Procedures for uranium-thorium and uranium disequilibrium dating of speleoth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c20b30e809ae3a24e6c400dd956ac288
https://doi.org/10.1016/0016-7037(75)90128-3
https://doi.org/10.1016/0016-7037(75)90128-3
Strontium isotope geochemistry of late cretaceous granodiorites, Jamaica and Haiti, greater Antilles
Publikováno v:
Earth and Planetary Science Letters. 43:112-116
Initial 87Sr/86Sr ratios have been determined for a representative suite of Upper Cretaceous granodiorites and associated rocks from the Above Rocks composite stock in central Jamaica and the Terre-Neuve pluton in northwestern Haiti. The average init
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a31900bc429eb20b11ea7075ecdeef2b
https://doi.org/10.1016/0012-821x(79)90160-2
https://doi.org/10.1016/0012-821x(79)90160-2
Publikováno v:
Analytical Letters. 12:831-840
The resin bead sample loading technique has been applied to a conventional single-stage mass spectrometer equipped with pulse counting. Isotopic data obtained for U and Pu are comparable to those obtainable from similar instruments using conventional
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a65429785116b2e67af16665cfc8b01c
https://doi.org/10.1080/00032717908059763
https://doi.org/10.1080/00032717908059763
Publikováno v:
Analytical Letters. 14:1603-1612
A method is described for extracting representative uranium and plutonium samples from highly radioactive solutions for isotopic mass spectrometric analysis. Anion resin beads in the nitrate form are used to effect separation from fission products an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f91f5d5a29016848b236ef0f8b78977
https://doi.org/10.1080/00032718108059824
https://doi.org/10.1080/00032718108059824
Publikováno v:
Canadian Journal of Earth Sciences. 11:1550-1561
Suites of samples from the Dore Lake Complex, the Chibougamau Pluton, and the volcanic Roy Group were analyzed for an age determination by the Rb–Sr whole-rock isochron method. The rocks of the Dore Lake Complex became a closed system with respect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50630b7672051ed6e96efdc4321772e8
https://doi.org/10.1139/e74-154
https://doi.org/10.1139/e74-154
Publikováno v:
Journal of Environmental Quality. 10:207-210
The uptake of /sup 238/U, /sup 232/Th, and /sup 239/Pu from soil by fescue, grasshoppers, and small mammals was compared at the contaminated White Oak Creek floodplain in East Tennessee. Comparisons of actinide uptake were based on analyses of radion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2961cee3dc5a4fd66ef5c06ffaf6634e
https://doi.org/10.2134/jeq1981.00472425001000020017x
https://doi.org/10.2134/jeq1981.00472425001000020017x
Publikováno v:
Analytica Chimica Acta. 142:355-359
A modified quadrupole mass spectrometer is housed in a van that serves as a mobile laboratory to provide on-site determinations of isotopic ratios and concentrations of uranium and plutonium. Each element can be determined at 1–3 ng levels with pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d0b4afe851c0a00d9dde20b1ed7a8834
https://doi.org/10.1016/s0003-2670(01)95304-8
https://doi.org/10.1016/s0003-2670(01)95304-8
Publikováno v:
Contributions to Mineralogy and Petrology. 65:91-99
Reconnaissance studies of early island-arc intrusions in the Cordillera Central of the Dominican Republic demonstrate that these rocks are mainly hornblende tonalite with lesser amounts of hornblende diorite, quartz diorite, granodiorite and quartz m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::460a106b8960bb6dd689e0798eb29cb9
https://doi.org/10.1007/bf00373574
https://doi.org/10.1007/bf00373574
Autor:
P. A. Gentry, Robert V. Gentry, David H. Smith, J. F. Emery, Warner H. Christie, S. S. Cristy, S.A. Reynolds, Raymond L. Walker
Publikováno v:
Science. 194:315-318
The discovery of embryonic halos around uranium-rich sites that exhibit very high (238)U/(206)Pb ratios suggests that uranium introduction may have occurred far more recently than previously supposed. The discovery of (210)Po halos derived from urani
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::780c656240e89427a19ad600b9dea14e
https://doi.org/10.1126/science.194.4262.315
https://doi.org/10.1126/science.194.4262.315