Abstract:Three different substrates for the analysis of liquid samples by Total Reflection X-Ray Fluorescence with Synchrotron Radiation (SR-TXRF) were investigated and compared: Lucite (Perspex), Kimfoil and Mylar. Dry targets were prepared by pipetting 5 µl aliquotes of the liquid samples (synthetic standards and fresh water samples) on the different substrates. A five fold reduction of the continuous background and a corresponding reduction of the elementary detection limits were observed when thin polymer film subs… Show more
“…The LOD is correlated with the signal peak and the background for the measurement of fluorescence spectrum. Several calculation methods of the limit of detection in X-ray spectroscopy have been reported in literatures [9][10][11]. The beam current, counting time and accelerating voltage play the key role for calculating the detection limits.…”
The facility of ion beam laboratory at Kochi University of Technology (KUT) has been extended by installing the Particle Induced X-ray Emission (PIXE) technique, in order to provide qualitative and quantitative elemental analysis and in-air micro-PIXE analysis. This paper is a description of PIXE setup and its application in biological sample for qualitative elemental analysis. The energy calibration of the system shows linearity. The minimum detection limit indicates that the system has good detection limit. The homogeneity shows uniformity of the sample itself and the internal standard within the sample. A 4 MeV He ++ ion beam was used to analyze shellfish samples. Analyzing samples, it was found that the lower Z elements as well as some trace elements were detected.
“…The LOD is correlated with the signal peak and the background for the measurement of fluorescence spectrum. Several calculation methods of the limit of detection in X-ray spectroscopy have been reported in literatures [9][10][11]. The beam current, counting time and accelerating voltage play the key role for calculating the detection limits.…”
The facility of ion beam laboratory at Kochi University of Technology (KUT) has been extended by installing the Particle Induced X-ray Emission (PIXE) technique, in order to provide qualitative and quantitative elemental analysis and in-air micro-PIXE analysis. This paper is a description of PIXE setup and its application in biological sample for qualitative elemental analysis. The energy calibration of the system shows linearity. The minimum detection limit indicates that the system has good detection limit. The homogeneity shows uniformity of the sample itself and the internal standard within the sample. A 4 MeV He ++ ion beam was used to analyze shellfish samples. Analyzing samples, it was found that the lower Z elements as well as some trace elements were detected.
“…When the fluorescence spectrum is measured, the MDL is correlated with the signal peak and the background. Different methods have been reported for calculation of the minimum detection of limits in X-ray spectroscopy [9][10][11]. The detection limits are calculated in PIXE analysis by assuming that the minimum intensity of the peak is three times the square root of the background at full width half maximum intensity.…”
“…There were, however, a number of crucial flaws in the dried thin method. First of all, Poli et al (2004) reported that as a result of a dissimilarity in the drying process of liquid samples on substrate film, the differences in adhesion and crystallization of the liquid sample may have occurred. Partially evaporation of components during drying process of liquid sample on a film layer can also create an unsound analytical result.…”
Quantifying the trace elements in infinitesimal ambient liquid samples (e.g., single raindrop, cloud/ fog water, and the soluble fraction extracted from the particles collected for a short time) is an important task for understanding formation processes, heating/cooling rates, and their health hazards. The purpose of this study is to employ an in-air micro PIXE system for quantitative analysis of the trace elements in a thimbleful of reference liquid sample. The bag type liquid sample holder originally designed with 10 μm thick Mylar ® film retained the original shape without any film perforation and apparent peaks of film blank by the end of the analysis. As one of tasks to be solved, the homogeneity of the elemental distribution in liquid reference species was verified by the X-ray line profiles for several references. It was possible to resolve the significant peaks for whole target elements corresponding to the channel number of micro-PIXE spectrum. The calibration curves for the six target elements (Si, S, Cl, Fe, Ni, and Zn) in standard solutions were successfully plotted by concentration (ppm) and ROI of interest net counts/dose (nC).
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