An investigation of the potentials of neutron activation analysis for the routine analysis of trace elements present in atmospheric
pollutants is discussed. Various techniques including sequential air sampling, multiple neutron irradiation, high resolution
γ-ray spectrometry, chemical isolation, high flux neutron irradiation and X-ray spectrometry have been employed to determine
the levels of Pb, Al, V, I, Cl, Mn, Cu, Br, Na, La, Mo, Au, Cr, Fe, Ni, Se, Zn, Ag and Co in atmospheric pollutants. The results
of the analysis of nearly two hundred samples collected from the Buffalo New York area during 1968–1969 are reported.
A naïve observer would be forgiven for assuming that the field of language evolution would, in terms of its scope and methodologies, look much like the field of evolutionary psychology, but with a particular emphasis on language. However, this is not the case. This editorial outlines some reasons why such a research agenda has not so far been pursued in any large-scale or systematic way, and briefly discusses one foundational aspect of that agenda, the question of evolutionary function. This background provides context for an introduction of the articles that appear in this special issue on the evolution of language.
Highly specific neutron activation analysis procedures involving post irradiation chemical separations were developed for
the determination of Cu, Hg, Zn, Cd, As, Se and Cr in fish tissues. The procedures developed were used to determine the levels
of these biologically active elements in some of the commercially important fish species of Lake Erie. The nuclear analytical
procedures developed generally involved the irradiation of fish tissues followed by wet-ashing in the presence of nonradioactive
carriers From the homogeneous solution of the tissue digest, the elements of interest were chemically isolated and the radio-activities
were measured by scintillation gamma ray spectrometry. The results reported include both the determination of the precision
and accuracies of each of these elemental analyses and a survey of these seven elements in nine major fish species of Lake
A unique application of forensic neutron activation analysis involving the analysis of trace levels of tungsten, cobalt and
tantalum was presented as evidence in a murder trial. The evidence materials analyzed included the blous of the victim, bed
sheets, a pair of pantyhose used in strangulation, head and public hair from the suspect, and several samples of raw materials
used at a factory where the suspect was employed. The stalned areas of the fabrics analyzed showed trace levels of cobalt,
tantalum, and tungsten which were not present in the fabric mattrices. The occupation of the suspect exposed him to fine dust
particulates containing these trace elements. Although eyewitness accounts indicated that the suspect was in the neighborhood,
there was, however, no evidence other that the neutron activation analysis results to indicate the probable presence of the
suspect at the scence of the crime. A jury trial accepting neutron activation analysis findings resulted in a conviction.
Authors:E. Lepel, S. Pratt, D. Robertson, C. Thomas, and D. Haggard
Three different spent control rods were obtained for direct-assay measurements and empirical sampling and analysis. They were: 1) a BWR cruciform control rod, 2) a PWR rod-cluster control assembly, and 3) a burnable poison-rod assembly. The dominant activity of the BWR cruciform control rod and the PWR burnable poison-rod assembly is60Co, whereas the PWR rod-cluster control assembly is dominated not only by60Co, but also by108mAg and110mAg, which are found in the Ag–In–Cd alloy of the absorber rods. The radionuclide inventories calculated for the three spent control rods from the empirical sampling data agree very well with data determined from the two direct assay methodologies. The concentration of108mAg in the rod-cluster control assembly will have to be considered when these types of spent control rods are prepared for waste disposal.
Authors:C. Mazzocchia, R. Anouchinsky, A. Kaddouri, M. Sautel, and G. Thomas
NiMoO4 obtained by calcination of precursors has been shown to be a very effective catalyst for oxidative dehydrogenation of propane
into propene. Preparation conditions and thermal decomposition of two precursors have been studied by TG-DTA, HTXRD, FFT-IR,
and thermo-desorption coupled to mass spectroscopy in order to determine their composition and to define the best treatment
to favour the oxidative dehydrogenation process. The selectivity and activity for propane transformation into propene are
very different depending on the nature of the precursor and of the active phases obtained after thermal activation. The more
selective high-temperature β phase of NiMoO4 has been obtained at a lower temperature (500°C) than previously reported (700°C).
Authors:H. Miley, R. Arthur, E. Lepel, S. Pratt, and C. Thomas
An International Monitoring System (IMS) is being created to monitor the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Radionuclide aerosols will be monitored to provide positive proof of an atmospheric explosion. In addition, a group of laboratories will perform quality assurance and confirmatory analyses of samples of interest. The field and laboratory systems will perform gamma-ray spectrometric analysis of air filters. While laboratories may undertake additional analysis such as chemical separation and beta counting, the scope of the work reported here is to make evaluations with respect only to gamma-ray spectrometry. Activation products have not been completely considered and are shaded with uncertainty, from the probability of escape from an underground test and the dependence on the sub-surface elemental composition.
Authors:D. Robertson, D. Haggard, C. Thomas, and N. Wynhoff
Three different methods for determining the long-lived radionuclide contents of highly neutron activated metal wastes are being compared and assessed using samples of pressurized-water reactor (PWR) and boiling-water reactor (BWR) spent fuel disassembly hardware and control rods. These methods include: 1) empirical analyses involving sampling and laboratory measurements; 2) direct assay techniques; 3) calculation methods. These techniques are discussed and the results of the comparisons made to date are presented. The agreement between empirical versus calculational methods for the disassembly hardware was generally within 10% to 50%, and rarely exceeded a factor of 2.5, especially near the fueled region of the reactor core. However, large discrepancies between the measured versus calculated concentrations were observed for59Ni and63Ni at the end fittings of the fuel assembly hardware, where the calculations underestimated the concentrations by factors varying from about 8 to 28. The calculation errors are believed to be due to inadequate cross section data for the nickel isotopes.