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  • ARAS  (1)
  • Internal dose  (1)
  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Determination of biokinetic parameters for ingestion of radionuclides of zirconium in animals using stable tracers (2000)
    Springer
    Radiation and environmental biophysics 39 (2000), S. 53-58 
    Details
    ISSN: 1432-2099
    Keywords: Key words Biokinetics ; Internal dose ; Intestinal absorption ; Stable tracers ; Zirconium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract  Exposure to the radioactive isotope 95Zr, as in nuclear accidents, and to stable zirconium, due to its use in industry, has increased the interest in the biokinetics of this element. Information has been derived mainly from tests performed on animals by means of radioactive tracers. Due to the fact that extrapolation from animals to humans is always open to question, there is an increasing need of a methodology which allows data to be obtained directly from humans. The use of stable tracers, being ethically justifiable, is a powerful tool for providing this information. As two tracers of the same element must be utilized in order to evaluate gut absorption, an analytical technique which is capable of distinguishing and measuring simultaneously different isotopes of zirconium in biological samples is required. Preliminary tests on laboratory animals were performed in order to assess the feasibility of the double tracer technique combined with proton activation analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00007687
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  • 2
    Electronic Resource
    Electronic Resource
    A shock tube study on the thermal decomposition of CS2 based on S(3P) and S(1D) concentration measurements (1994)
    Springer
    Shock waves 4 (1994), S. 95-99 
    Details
    ISSN: 1432-2153
    Keywords: ARAS ; Chemical shock tube ; Thermal decomposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract The thermal decomposition of CS2 highly diluted in Ar was studied behind reflected shock waves by monitoring time-dependent absorption profiles of S(3P) and S(1D) using atomic resonance absorption spectroscopy (ARAS). The rate coefficient of the reaction: (R1) $$\begin{gathered} CS_2 + M\mathop \to \limits^{k_1 } CS + S + M, \hfill \\ k_1 = 5.1 \times 10^{14} \exp \left( {\frac{{ - 38150K}}{T}} \right)cm^3 mol^{ - 1} s^{ - 1} \hfill \\ \end{gathered} $$ . was determined in experiments with initial concentrations of CS2 between 5 and 50 ppm at post-shock conditions of 2300 K≤T≤3360 K and total densities between 2.2×1018 cm−3 and 3.9×1018 cm−3. In experiments with higher initial concentrations of 100 ppm CS2 in Ar, the S(3P) concentrations were found to reach quasi-stationary values. From the steady state assumption a value for the rate coefficient of the most probable S consuming reaction: (R2) $$\begin{gathered} CS_2 + S\mathop \rightleftharpoons \limits^{k_2 } CS + S_2 , \hfill \\ k_2 \approx 1.2 \times 10^{13} cm^3 mol^{ - 1} s^{ - 1} \hfill \\ \end{gathered} $$ . was estimated at temperatures between 2100 K and 2340 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418572
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    Paper (German National Licenses)
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