Instrumental neutron activation analysis (INAA) was applied to assess element concentrations in eleven samples of mineral
supplements/multivitamins acquired in drugstores and pharmacies in São Paulo city, SP, Brazil. Concentrations of Ca, Co, Cr,
Cu, Fe, K, Na, Se and Zn were determined. A comparison was made between the results obtained with the labels of the mineral
supplents. Certified reference materials, NIST SRM1400 Bone Ash and NIST SRM 1633b Coal Fly Ash were analyzed for quality
control of the analytical results.
Authors:A. Montero, J. Estévez, R. Padilla, and D. López
A study was carried out in Havana City using lichen as monitor of air pollution. The concentration of several trace elements
(Ca, Mn, Fe, Ni, Cu, Zn, Sr, Cd, Pb) in a total of 225 samples was determined by Total Reflection X Ray Fluorescence (TRXRF),
Flame Atomic Absorption Spectroscopy (FAAS) and Anodic Stripping Voltammetry (ASV). In addition several Biological Certified
Reference Materials (CRM’s) were analyzed in order to assess the analytical performance of the results. In general a relatively
good agreement was found among the techniques. No significant differences were found between the obtained results and the
certified reference values.
Authors:R. Leite, W. Jacob-Filho, M. Saiki, L. Grinberg, and R. Ferretti
Neutron activation analysis was applied to assess trace element concentrations in brain tissues from normal (n = 21) and demented individuals (n = 21) of both genders aged more than 50 years. Concentrations of the elements Br, Fe, K, Na, Rb, Se and Zn were determined.
Comparisons were made between the results obtained for the hippocampus and frontal cortex tissues, as well as, those obtained
in brains of normal and demented individuals. Certified reference materials, NIST 1566b Oyster Tissue and NIST 1577b Bovine
Liver were analyzed for quality of the analytical results.
The analysis of impurities in uranium matrices is performed in a variety of fields, e.g., for quality control in the production
stream converting uranium ores to fuels, as element signatures in nuclear forensics and safeguards, and for non-proliferation
control. We have investigated the capabilities of time-of-flight ICP-MS for the analysis of impurities in uranium matrices
using a matrix-matched method. The method was applied to the New Brunswick Laboratory CRM 124(1–7) series. For the seven certified
reference materials, an overall precision and accuracy of approximately 5% and 14%, respectively, were obtained for 18 analyzed
Authors:Zs. Szántó, M. Hult, U. Wätjen, and T. Altzitzoglou
The paper presents the results of radiological investigation of several mushroom samples collected in the fall of 2004 in
different parts of Europe. The work was performed in order to support decision making to develop and produce a certified reference
material for quality assurance of radionuclide measurements in environmental samples. The levels of 137Cs in mushrooms varied widely ranging from 0.6 to 4300 Bq/kg on dry mass basis, while those of natural 40K were relatively constant. In one sample 60Co of unknown origin was detected (25±2 Bq/kg dry mass), while 90Sr concentrations were usually below the detection limit (<150 mBq/kg dry mass).
An automated delayed neutron counting (DNC) system has been developed at the Royal Military College of Canada (RMC) to enhance
nuclear forensics capabilities pertaining to special nuclear material analysis. The system utilises the SLOWPOKE-2 Facility
at RMC as a neutron source and 3He detectors. System control and data acquisition occur through a LabVIEW platform. The time dependent count rate of the delayed
neutron production has been examined for 235U, using certified reference materials. Experimental validation according to ISO 17025 protocols suggests typical errors and
precision of −3.6 and 3.1%, respectively, and a detection limit of 0.26 μg 235U.
Authors:A. Di Piero, A. Di Piero, M. A. Bacchi, M. A. Bacchi, E. A. N. Fernandes, and E. A. N. Fernandes
The k0-method in INAA has been used at CENA/USP Brazil for analyzing geological and biological materials. With the acquisition of
a well-type detector, it was realized that the true-coincidence effects, originally corrected by semi-empirical procedures
with the in-house k0-software (Quantu-INAA), would affect the accuracy of results. Thus, new coincidence correction algorithms were developed,
based on a theoretical equation for obtaining the correction factors. Validation of the algorithms was performed by analysis
of plant certified reference materials.
Authors:M. Saiki, N. M. Sumita, O. Jaluul, I. F. Sobreiro, W. Jacob Filho, and M. B. A. Vasconcellos
In this study a protocol for blood serum analysis was defined and the concentrations for Br, Ca, Cl, Fe, Na, Rb, Se and Zn
were obtained by instrumental neutron activation analysis. Blood samples were collected from healthy elderly volunteers who
were selected based on the SENIEUR protocol. Contamination of blood by the collection procedure was also evaluated and found
negligible. The serum was separated by centrifugation, then freeze-dried and analyzed. Most of results obtained were within
the acceptable value ranges used by physicians for normal population. The certified reference material, NIST SRM 1566b Oyster
Tissue was analyzed for quality control.
The advantages and drawbacks of using instrumental neutron activation analysis (INAA) and inductively coupled plasma mass spectrometry (ICP-MS) for soil, sediment, plant and water pollution studies are discussed. The experimental procedures used for each method and for each type of sample matrix are described. They were tested on several certified reference materials. The results obtained on these materials showed good agreement for many elements for which the two techniques are suited, and they were complementary for the other elements which are also of environmental interest. An element-by-element assessment is presented to indicate the precautions to be taken and the most convenient technique for each of them.
Mn-nodule is one of the most important deep sea mineral resources to be explored and exploited in the next century. Analytical quality control based on this kind of Certified Reference Materials (CRMs) is therefore necessay. In the present work, nearly 30 elements in two Chinese Mn nodule Reference Materials (RMs), GSPN-2 and GSPN-3, were determined using extendedK0-relative comparison NAA technique, developed in our laboratory. The unique features of this work include; (1) high accuracy obtained by the interal validation function of our technique; (2) extensive determinable elements obtained by the hybrid nature of our software and (3) neutron flux self-shielding corrections.