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  • Author or Editor: H. Lukens x
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Abstract  

Radiolabeled morphine and cocaine vapors have been used to determine the approximate binding site densities of immobilized, airdried antibodies toward these substances. Vapor pressures of the radiolabeled substances have also been determined.

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Abstract  

A neutron activation analysis procedure that utilizes reactor pulsing, rapid sample transfer and a Cerenkov counter for the determination of Be, Li, B, and F via very short-lived radioisotopic indicators is shown to give analytical sensitivities for these elements of 15μg, 0.0008μg, 1.1μg, and 0.83μg, respectively. Use of a NaI(Tl) counter coupled to the same system enables the detection of 0.4μg of Pb via 0.8 second207mPb.

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Abstract  

Measurement of uranium in highly enriched reactor fuel sticks has been achieved by elaboration of the method of Amiel. Calibration of the method was achieved by three methods: comparison of dissolved sample with aqueous standard, comparison of sample, with handcrafted standard stick, and the extrapolated-aliquot procedure. Precision and accuracy of<0.5% relative are achieved in<2 min measurement time on a production basis, Precisions of<0.1% relative are achieved in replicate measurements.

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Abstract  

A lithium-drifted germanium detector, 40 cm3, combined with a radiochemical group separation, has been utilized to determine the concentrations of 14 stable rare-earth elements in a silicate rock sample, following thermal-neutron activation. Thirteen rare earths could be determined within an 8-day decay period. The remaining rare-earth element (Tm) required a longer delay, and subtraction of the interfering contribution from160Tb. Samples of standard rock G-1 and W-1 were also analyzed by this procedure for 13 rare earth elements, results of which are compared with literature values.

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