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Related Experiment Videos

Short-time neutron activation gamma-ray spectroscopy.

K M Ochsenkühn1, N N Papadopoulos, P A Kontopoulos

  • 1National Center for Scientific Research "Demokritos", Aghia Paraskevi Attikis, 15 310, Athens, Greece.

Analytical and Bioanalytical Chemistry
|June 1, 1996
PubMed
Summary

Optimized experimental conditions enable high-throughput, sensitive, and accurate short-time instrumental neutron activation analysis. Techniques like loss-free counting and selective preseparation overcome challenges from high initial count rates and matrix interferences.

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Area of Science:

  • Analytical Chemistry
  • Nuclear Chemistry

Background:

  • Short-time instrumental neutron activation analysis (INAA) faces challenges with high initial count rates and matrix interferences.
  • Achieving high throughput, sensitivity, and accuracy requires overcoming these limitations.

Purpose of the Study:

  • To present optimized experimental conditions for short-time INAA.
  • To demonstrate methods for achieving high throughput, sensitivity, and accuracy without matrix interferences.

Main Methods:

  • Utilizing a loss-free counting system to manage high initial count rates.
  • Employing source-detector distance variation, cyclic, and cumulative activation to compensate for short-lived nuclide decay.
  • Implementing ion exchange for selective element preseparation and neutron spectrum optimization (e.g., epithermal neutron activation) to reduce matrix spectral interferences.

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Main Results:

  • Successful management of high initial counting rates through loss-free counting.
  • Compensation for low counting statistics of short-lived nuclides via optimized counting geometries and activation strategies.
  • Significant reduction of matrix spectral interferences through preseparation and neutron spectrum tailoring.

Conclusions:

  • Optimized experimental conditions allow for high-throughput, sensitive, and accurate short-time INAA.
  • A combination of techniques effectively addresses challenges posed by high count rates and matrix effects.
  • The presented methods enhance the applicability of INAA for rapid elemental analysis.