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.
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.
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.
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.