Authors:G. Arana, U. Wätjen, C. Ingelbrecht, and P. Robouch
Five copper alloys were prepared with modern powder metallurgical processes in the frame of the European project Improvement of Means of Measurement on Archaeological Copper-Alloys for Characterisation and Conservation (IMMACO) and certified for As, Pb, Sn and Zn mass fractions. Similar in their composition to archaeological bronze alloys, these Certified Reference Materials (CRMs) are to be used for calibration of XRF instruments for characterization of archaeological samples either in the laboratory or in the field. This paper presents and compares the successful contribution of our non-destructive analytical methods (k0-NAA and PIXE) to the IMMACO project and to the certification of the five reference materials.
Authors:A. Kimura, Y. Toh, M. Oshima, Y. Hatsukawa, and J. Goto
Recycled steel products demands a new technique for determining tramp elements in steel. In this paper, As and Sb in iron
certified reference materials were determined by neutron activation analysis with the multiple gamma-ray detection method.
The determined values are in good agreement with certified and reference values. The lower determination limits (LDL) for
As and Sb in high purity iron are 0.012 and 0.0025 ppm, respectively. As the demanded LDL for As and Sb is 0.1 ppm, the method
described in this work is suitable for determining As and Sb in recycled steel.
Authors:M. Bacchi, L. Santos, E. De Nadai Fernandes, P. Bode, F. Tagliaferro, and E. França
The effectiveness of a Compton suppression system (CSS) for instrumental neutron activation analysis of plant materials was
evaluated. Suppression factors were measured with 137Cs sources. Five certified reference materials were analyzed and the detection limits calculated from both suppressed and
unsuppressed spectra were compared. The CSS demonstrated to be useful for lowering the detection limits of ten out of sixteen
elements tested, showing a maximum improvement factor of 3.9. The system performance was strongly influenced by the sample
composition and also by the measurement conditions, indicating the importance of testing each individual sample type and analytical
The thermal neutron prompt gamma-ray activation analysis (PGAA) facility, operated by the US Food and Drug Administration and National Institute of Standards and Technology Center for Neutron Research, has been redesigned to lower background radiation levels and improved analytical capabilities. Analysis of 22 element standards and food and botanical certified reference materials revealed significant sensitivity increases and lower limits of detection for H, B, C, N, Na, Al, P, S, Cl, K, Ca, Fe, and Cd. Mass fractions for these elements, as well as Mg, Al, Si, Ti, Mn, Fe, Cu, I, Zn, Sm, and Gd, were determined for 6 dietary supplements.
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.
A fast pneumatic transfer facility was installed in Nuclear Engineering Teaching Laboratory (NETL) of the University of Texas
at Austin for the purpose of cyclic thermal and epithermal neutron activation analysis. In this study efforts were focused
on the evaluation of cyclic epithermal neutron activation analysis (CENAA). Various NIST and CANMET certified materials were
analyzed by the system. Experiment results showed 110Ag with its 25 s half-life as one of the isotopes favored by the system. Thus, the system was put into practical application
in identifying silver in metallic ores. Comparison of sliver concentrations as determined by CENAA in CANMET certified reference
materials gave very good results.
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:Yong-Sam Chung, Sun-Ha Kim, Jong-Hwa Moon, Hark-Rho Kim, Jong-Myoung Lim, and Jin-Hong Lee
For air pollution monitoring, about 1300 airborne particulate matter samples were collected by using a low volume air sampler
and a polycarbonate filter at two sampling sites in an urban region, Daejeon, the middle of Korea from 2003 to 2006. Mass
concentrations of the black carbon were measured using a smoke stain reflectometer. The concentrations of 24 elements in the
collected samples were analyzed by using instrumental neutron activation analysis, and its temporal trends and enrichment
factors were investigated under different environmental conditions. Analytical control was carried out by using certified
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.