P. Arikan

Field study on thorium uptake by plants within and around of a thorium ore deposit

Thorium concentration was determined in natural forage materials, thyme and barley (stern and kemel) in underlying substrate soil within, and around the thorium mine in Kizilcaoren-Eskisehir. Plant/soil concentration ratios (CR) for thorium were estimated in details for sixteen places including ore pits, mine tailings and cultivation area. The experiments were carried out by using energy dispersive X-ray fluorescence spectrometry. As a result, no demonstrable differences in thorium concentrations between washed plant groups except thyme, and collection time were found. However, thorium amount and CR values for unwashed plant samples were higher than those for washed ones at all sites due to dust contamination. No thorium was observed in the kemels

Determination of wear metals in used lubricating oils by X-ray fluorescence spectrometry

Abstract Application of an X-ray fluorescence analytical procedure for the determination of wear metals in used lubricating oils is described. Oil saoples were collected from UH-IH type helicopter engines at regular intervals and subjected to chemical peatreatment in order to remove the high viscosity of the oil and particle size effects. The procedure was used to determine the concentration of topper and iron wear metals in oils. They were found to increase with engine operating time. The results obtained show that the XRFS procedure provides a better indication of impending machine failure than conventional methods.

Study of Lead Pollution by Edxrf Analysis

Abstract Energy dispersive X-ray fluorescence analysis is applied to determine lead pollution from various locations near the highway of Ankara - Istanbul. In this proposed study, a complete optimization including sampling, homogeneity, particle size, critical thickness, measurement geometry for analysis of soils and plants is carried out. It is observed the contribution of the motor transport, along the 25 km of highway, to the lead pollution is very considerable depending on heavy traffic.

Determination of high-Z materials in low-Z medium by X-ray scattering techniques

Abstract The quantitative determination of high- Z elements (mineral matter and ash) in low- Z medium (coal) by X-ray scattering techniques is presented. The X-ray fluorescence method and backscattering techniques were used to examine 40 well characterized domestic lignite samples from different deposits. The ash content in the coal samples was found to vary between 6 and 25%. Correlations between the Rayleigh/Compton intensity ratio ( R/C ) and ash and between R/C and mineral matter of coal were depicted with linear and quadratic functions.

Thorium ore analysis by X-rays in neutron activation analysis

The possibility of using characteristic X-rays from radioactive elements in activatio analysis was investigated during this work with particular emphasis on (n, γ) products. The detection sensitivities for some elements are determined by X-rays employing a235Pu-Be neutron source. The technique has been applied to the analysis of thorium ores from the Anatolia Region, with great accuracy.

Investigation of particle size and heterogeneity effects on analysis of thorium in powdered ore

The particle size and heterogeneity effects on the analyte line were investigated for the analysis of powdered samples by X-ray fluorescence technique. In the analysis of samples utilizing the powder method, these effects caused serious errors with variations in particle size for the emitted intensity. These effects were minimized by applying certain treatment methods to the sample. Standard addition method was based on the measurement of the Lα line for thorium.

X-Ray Fluorescence Analysis of Iron in Ore Dressing Processes

Abstract The investigation of iron using off - line energy dispersive X-ray fluorescence, in iron ore dressing process, is presented. Techniques have been developed to determine the quality control of grinding, homogenization, separation, classification processes and residue material in dry basis of iron deposit. The laboratory trials on a wide variety of iron ores indicated that the range of ore grades is from 28–40 % Fe and maximum value is to be found 70 % Fe for processed ore. The results obtained increased the knowledge and performance of the dressing process which is of basic importance for its improvement and future automation.

A case study on uptake of thorium from soil to plant by using X-ray fluorescence spectrometry

A case study was carried out to determine the uptake of thorium from soil to plant by using X-ray fluorescence technique. The radioecological experiment was undertaken to provide plant/soil concentration ratio (CR) data for thorium using 2 types of plant (barley and common vetch)×4 levels of Th(0, 1500, 3000,4500ppm)×2 types of soil (acidic and alkaline) with different configuration parameters. The calibration of the analytical method for thorium on dry basis of samples is described by using109Cd excitation source. The results indicated that theCR values decreased with the corresponding Th concentration in soils with a 1000 fold range and differed among soil and plant types.

Determination of tungsten in ores by X-ray fluorescence technique and X-rays in neutron activation analysis

Two distinct analytical methods have been described for analysis of W in tungsten ores. For the proposed study, thick and thin samples were analyzed by using X-ray fluorescence technique with great accuracy. Standard comparison method is based on the measurement of Kα line for tungsten. Also, W has been determined in similar ore samples by neutron activation analysis followed by X-ray spectrometry employing a238Pu-Be neutron source. The measured Re K-X rays are emitted in internal conversion of137W produced during thermal neutron activation.

LIII subshell intensity ratios of Au

ABSTRACT In this study, LIII subshell intensity ratios were measured using an energy dispersive x-ray spectroscopy method. Only the LIII subshell of gold was excited by the characteristic x-rays of the element used as the secondary source (Br- K α,β rays from NaBr). The emitted x-rays were measured with a Si(Li) detector system coupled to a multi-channel analyser and computer system. L ι /L α1,2, L2,15/L α1,2, L β6/L α1,2 intensity ratios of Au were determined by spectral analysis. The experimental results are compared with those of other experimenters and with the Scofield calculations.