Neutron Activation Determination of Molybdenum and Tungsten in Meteorites |
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12 N HCl 55 LOS ANGELES absorbance abundance activation analysis aliquots alpha-benzoin oxime ANGELES 55 ANGELES OF CALIFORN ANGELES THE LIBRARY ANGELES THE UNIVERSITY approximately aqueous phase atoms butyl acetate calculated CALIFORN OF CALIFORN CALIFORN THE UNIVERSITY carrier solution cation exchange columns chemical separation chondrites citric acid Conc concentration Counting Rate counts per minute crucible determination of molybdenum determining molybdenum diluted dissolved dithiol elements eluted error extracted fast-neutron fraction gamma ray Gamma spectrum grams H Chondrite half-life HNO3 hydroquinone iron meteorites irradiation isotope keV/channel metal phases metal to silicate method mixture molybdenum and tungsten Molybdenum chemical yields monitor solution n-butyl neutron activation neutron flux nuclear obtained organic phase pallasites precipitate procedure radioactive reactions reactor reagent self-shielding siderophilic silicate phase silicate samples sodium peroxide solu standard deviation Student's t distribution thermal neutron tion toluene-3,4-dithiol U.S. Geological Survey UNIVERSITY LOS ANGELES UNIVERSITY OF CALIFORNIA volumetric flasks Wasson weight