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Chopped Cold Neutron Beam Activation Analysis.

Danyal J Turkoglu1, H Heather Chen-Mayer2

  • 1Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899 USA. He is now with USNC-Tech, Seattle, WA 98199 USA.

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Summary
This summary is machine-generated.

A new linear fast neutron beam chopper enables in-beam activation analysis of short-lived isotopes without sample transfer. This system allows for precise, quantitative analysis of neutron capture products, improving accuracy in nuclear measurements.

Keywords:
Chopped neutron beamlinear chopperneutron activation analysisshort-lived activation product

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Area of Science:

  • Nuclear Physics
  • Analytical Chemistry
  • Materials Science

Background:

  • Prompt Gamma Activation Analysis (PGAA) traditionally requires sample transfer for analyzing neutron capture products.
  • Short-lived isotopes pose challenges due to their rapid decay, necessitating rapid analysis techniques.
  • Existing methods may lack the precision for quantitative analysis of specific isotopes.

Purpose of the Study:

  • To design and implement a linear fast neutron beam chopper for in-beam activation analysis.
  • To enable the analysis of short-lived neutron capture products without sample transfer.
  • To demonstrate the system's capability for quantitative analysis and peak separation.

Main Methods:

  • Deployment of a linear fast neutron beam chopper at a PGAA instrument.
  • In-beam activation analysis of short-lived isotopes (T1/2 > ~10 ms).
  • Optimization of chopper timing for specific isotopes (Se-77, Yb-175m, Dy-165).
  • Utilizing time-stamped list mode data acquisition for peak separation.

Main Results:

  • Successful in-beam activation analysis of short-lived isotopes was achieved.
  • The system demonstrated quantitative analysis capabilities through linear response to mass increments.
  • Optimized chopper timing showed advantages for specific isotope analysis.
  • Separation of overlapping energy peaks was demonstrated using list mode data.

Conclusions:

  • The linear fast neutron beam chopper effectively enables in-beam activation analysis of short-lived isotopes.
  • The system is suitable for quantitative analysis and offers advantages in isotope-specific measurements.
  • Time-stamped data acquisition aids in resolving complex spectra.