scholarly journals Rapid $sup 15$N isotopic-ratio and total nitrogen analytical system for environmental samples

1975 ◽  
Author(s):  
J. A. Carter ◽  
J. R. Walton ◽  
R. L. Walker ◽  
D. R. Matthews
Keyword(s):  
Total Nitrogen ◽  
Environmental Samples ◽  
Isotopic Ratio ◽  
Analytical System

A portable analytical system for rapid on-site determination of total nitrogen in water

2021 ◽  
pp. 117410
Author(s):  
Chen Zhao ◽  
Longyan Chen ◽  
Guowei Zhong ◽  
Qiyang Wu ◽  
Jinxia Liu ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Analytical System

Deconvolution of alpha liquid scintillation spectra for quantitative analysis of actinide elements in water samples

2004 ◽  
Vol 92 (3) ◽  
Author(s):  
Jean Aupiais
Keyword(s):  
Quantitative Analysis ◽  
Water Samples ◽  
Environmental Samples ◽  
Liquid Scintillation ◽  
Isotopic Ratio ◽  
Ratio Determination ◽  
Alpha Beta ◽  
Uranium Plutonium ◽  
Actinide Elements

SummaryThe reliability and accuracy of actinide measurement in environmental samples strongly depend on theThe intensity of the internal conversions for thorium, uranium, plutonium and americium have been calculated and normalised to the intensity of the main alpha transition. These data can be used to determine the activity of any above-mentioned actinide by alpha liquid scintillation with alpha/beta discrimination. The quantitative analysis and the isotopic ratio determination of several certified solutions of actinides demonstrate the validity of this approach.

scholarly journals Estimation of Uranium Sources in Environmental Samples Using the Isotopic Ratio Determination

2020 ◽  
Author(s):  
Junko Shikimori ◽  
Takeshi Ohno ◽  
Yusuke Fukami ◽  
Yasuhito Igarashi
Keyword(s):  
Environmental Samples ◽  
Isotopic Ratio ◽  
Ratio Determination ◽  
Uranium Sources

Ultra-trace determination of the 135Cs/137Cs isotopic ratio by thermal ionization mass spectrometry with application to Fukushima marine sediment samples

2019 ◽  
Vol 34 (2) ◽  
pp. 301-309 ◽  
Author(s):  
Wenting Bu ◽  
Lei Tang ◽  
Xuemei Liu ◽  
Zhongtang Wang ◽  
Miho Fukuda ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Environmental Samples ◽  
Thermal Ionization Mass Spectrometry ◽  
Isotopic Ratio ◽  
Ionization Mass ◽  
Trace Determination ◽  
Sediment Samples ◽  
Thermal Ionization Mass ◽  
Ultra Trace

A new method was developed for determination of the 135Cs/137Cs isotopic ratio at the femtogram level in environmental samples.

scholarly journals Isotopic Ratio of 135Cs/137Cs in Fukushima Environmental Samples Collected in 2011

2016 ◽  
pp. 25-31
Author(s):  
Takumi Kubota ◽  
Yuji Shibahara ◽  
Tomoko Ohta ◽  
Satoshi Fukutani ◽  
Toshiyuki Fujii ◽  
...  
Keyword(s):  
Environmental Samples ◽  
Isotopic Ratio

scholarly journals Determination of Uranium Isotopic Ratio 235U/238U in Environmental Samples by Neutron Activation Analysis

1973 ◽  
Vol 8 (3) ◽  
pp. 153-160 ◽  
Author(s):  
Hiroshige MORISHIMA ◽  
Yukinori KATSURAYAMA ◽  
Takao TSURUTA ◽  
Taeko KOGA ◽  
Hiroshi KAWAI ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Environmental Samples ◽  
Isotopic Ratio

scholarly journals Preliminary Measurements of Be-10/Be-7 Ratio in Rainwater for Atmospheric Transport Analysis

2020 ◽  
Vol 7 (2) ◽  
pp. 145-151
Author(s):  
K. de los Ríos ◽  
C. Méndez-García ◽  
L. Acosta ◽  
R. García-Martínez ◽  
M. A. Martínez-Carrillo ◽  
...  
Keyword(s):  
Environmental Samples ◽  
Metropolitan Areas ◽  
Atmospheric Transport ◽  
Isotopic Ratio ◽  
Preliminary Results ◽  
Atmospheric Flows ◽  
Decay Spectroscopy ◽  
Transport Analysis ◽  
Gamma Decay

The meteoric cosmogenic beryllium has been used as an essential geophysical tracer in the analysis of atmospheric flows and erosion soils since 1960. The first measurements Be-7 and Be-10 concentrations in rainwater from Mexico, have been carried out by using gamma decay spectroscopy and AMS techniques, respectively for each isotope. With this it was possible to report a preliminar value for the Be-10/Be-7 isotopic ratio in such environmental samples. The present work described preliminary results related to rainwater collected at mountain and metropolitan areas. Results are compared with predictions and previous measurements for both radioisotopes, observing a very sensible behavior particularly for the case of Be-7 activities.

Pollutant Identification by Selected Area Electron Diffraction

1974 ◽  
Vol 32 ◽  
pp. 532-533
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson ◽  
C. W. Walker
Keyword(s):  
Thermal Treatment ◽  
Electron Diffraction ◽  
Sample Preparation ◽  
Crystal Structures ◽  
Water Samples ◽  
Environmental Samples ◽  
Short Review ◽  
Selected Area Electron Diffraction ◽  
Multiple Component

Selected area electron diffraction (SAD) has been used successfully to determine crystal structures, identify traces of minerals in rocks, and characterize the phases formed during thermal treatment of micron-sized particles. There is an increased interest in the method because it has the potential capability of identifying micron-sized pollutants in air and water samples. This paper is a short review of the theory behind SAD and a discussion of the sample preparation employed for the analysis of multiple component environmental samples.

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