Authors:Mária Földvári, Zsolt Berner, and Doris Stüben
Thermoanalytical (TA) analysis is not at all a frequently used method for studying travertine. Therefore the application of two TA techniques is presented for characterization of the Buda-Vár-hegy (Castle Hill), Budakalász and Szomód-Les-hegy Quaternary travertine occurrences in this paper. TA data give comparable results with those of oxygen and carbon stable isotope compositions and offer a new way to estimate the temperature of carbonate precipitation.
Instrumental neutron activation analysis was applied to 61 ivory samples of which origin countries are known. 12 elements such as Br, Ca, Cl, Co, Cs, Fe, Mg, Mn, Na, Sc, Sr and Zn, were determined in all samples. The factor score of each sample was calculated for each factor by making use of principal component analysis in order to determine their origins. The results were compared with those by stable isotope analysis (13C and15N).
Instrumental neutron activation analysis was applied to 80 samples from various African countries and 81 samples from the
Kruger National Park in the Republic of South Africa. Twelve elements such as Br, Ca, Cl, Co, Cs, Fe, Mg, Mn, Na, Sc, Sr,
and Zn, were determined in all samples. The factor scores of each sample were calculated from those elemental concentrations
for the first and second factors to clarify the differences of samples from various African countries with those from Kruger
Park. The results were compared with those by stable isotope analysis (13C and15N).
Authors:H. Yoshikawa, C. Yonezawa, T. Kurosawa, M. Hoshi, and H. Ishikawa
The application of stable isotope analysis using neutron-induced prompt -ray analysis (PGA) with cold/thermal neutron beams for the tracer study of geological materials are discussed. Silicon has three natural isotopes differing in abundance:28Si (92.23%),29Si (4.67%) and30Si (3.10%). For the purpose of the assessment of Si migration in engineered barrier material, enriched30Si can be used as a tracer due to its nuclear and chemical properties. Isotope analysis of30Si was performed by PGA during the tracer study. Neutron intensity at the sample position was 1.4·108 n¢cm–2·s–1, 2.4·107 n·cm–2·s–1 for cold and themal neutron guided beams of JRR-3M, respectively. Calibration curves and analytical sensitivity of30Si were determined based on measurement of standard samples. BG and detection limits for30Si analysis were also measured in Japanese bentonite (Kunigel V1 and Kunipia F) and their pore water. Fiffteen elements were determined simultaneously using PGA.
-sized brachiopod populations) are decisive for the recognition of fossil/recent vents/seeps, as discussed by Callender and Powell ( 1992 ). Later, Bujtor ( 2007 ) initiated a stableisotopeanalysis and ruled out the seep origin but proposed a genetic model and