Measurement and Traceability Issues in Isotope Amount Ratio Determination of Stable Isotopes

MAPAN ◽  
2021 ◽  
Author(s):  
Praveen Kumar Yadav ◽  
Chinky Kochar ◽  
Lakhan Taneja ◽  
S. Swarupa Tripathy
Keyword(s):  
Stable Isotopes ◽  
Ratio Determination ◽  
Isotope Amount Ratio

scholarly journals Determination of kinetic parameters of apolipoprotein B metabolism using amino acids labeled with stable isotopes.

1991 ◽  
Vol 32 (8) ◽  
pp. 1311-1323
Author(s):  
KG Parhofer ◽  
P Hugh ◽  
R Barrett ◽  
DM Bier ◽  
G Schonfeld
Keyword(s):  
Amino Acids ◽  
Stable Isotopes ◽  
Kinetic Parameters ◽  
Apolipoprotein B

Theoretical progress in the H2+ molecular ion: towards electron to proton mass ratio determinationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 103-107 ◽  
Author(s):  
J.-Ph. Karr ◽  
L. Hilico ◽  
V. I. Korobov
Keyword(s):  
High Resolution ◽  
Mass Ratio ◽  
Theoretical Determination ◽  
Atomic Systems ◽  
The Road ◽  
Theoretical Progress ◽  
Proton Mass ◽  
Accuracy Level ◽  
Ratio Determination

High resolution ro-vibrational spectroscopy of H 2+ or HD+ can lead to a significantly improved determination of the electron to proton mass ratio me/mp if the theoretical determination of transition frequencies becomes sufficiently accurate. We report on recent theoretical progress in the description of the hyperfine structure of H 2+ , as well as first steps in the evaluation of radiative corrections at order mα7. Completion of the latter calculation should allow us to reach the projected 10−10 accuracy level and open the road to mass ratio determination.

The Measurement of Calcium Absorption and Absorption Rate with an External Arm Radioactivity Counter

1978 ◽  
Vol 54 (1) ◽  
pp. 93-97
Author(s):  
R. C. Smart ◽  
C. D. Holdsworth
Keyword(s):  
Absorption Rate ◽  
Calcium Absorption ◽  
Scintillation Counter ◽  
Total Calcium ◽  
Ratio Determination ◽  
Lead Shielding ◽  
Deconvolution Techniques ◽  
Serial Measurements ◽  
Radioactivity Measurements

1. A large-volume scintillation counter was used to measure calcium absorption from the ratio of forearm uptake of 47Ca after oral 47CaCl2 (administered with milk) to forearm uptake after intravenously administered 47CaCl2. 2. In some subjects serial measurements of both forearm uptake of 47Ca and blood 47Ca radioactivity were also recorded, and by using deconvolution both total calcium absorption and calcium absorption rate were determined. 3. The forearm ratio determination of 47Ca absorption correlated well with that obtained by deconvolution of either serial blood 47Ca or forearm 47Ca measurements provided that the forearm radioactivity measurements were made at least 8 h after the administrations of 47CaCl2. 4. Although the two deconvolution techniques gave similar estimates of total calcium absorption there were discrepancies between their measurements of calcium absorption rate. These discrepancies were reduced but not eliminated by the use of additional lead shielding around the Armac counter.

scholarly journals Determination of paeonol metabolites in man by the use of stable isotopes.

1981 ◽  
Vol 29 (7) ◽  
pp. 2043-2050 ◽  
Author(s):  
KUNIO MIMURA ◽  
SHIGEO BABA
Keyword(s):  
Stable Isotopes

Determination of food sources and trophic position in Malaysian tropical highland streams using carbon and nitrogen stable isotopes

2017 ◽  
Vol 37 (2) ◽  
pp. 97-104 ◽  
Author(s):  
Dhiya Shafiqah Ridzuan ◽  
Che Salmah Md. Rawi ◽  
Suhaila Abdul Hamid ◽  
Salman Abdo Al-Shami
Keyword(s):  
Stable Isotopes ◽  
Trophic Position ◽  
Food Sources ◽  
Nitrogen Stable Isotopes ◽  
Carbon And Nitrogen ◽  
Highland Streams

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.

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