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Related Experiment Video

Updated: May 6, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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Digital dual-parameter data acquisition for SP2 hydrogen-filled proportional counters.

N P Hawkes1, N J Roberts2

  • 1National Physical Laboratory, Hampton Road, Teddington, Middx TW11 0LW, UK nigel.hawkes@npl.co.uk.

Radiation Protection Dosimetry
|November 6, 2013
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Summary

This study introduces a digital sampling system for hydrogen-filled proportional counters, improving neutron spectroscopy by distinguishing neutron and gamma ray signals using pulse rise time. This digital method offers a simpler alternative to complex analogue systems.

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Area of Science:

  • Nuclear Physics
  • Detector Technology
  • Spectroscopy

Background:

  • Hydrogen-filled proportional counters are effective neutron spectrometers up to 1.5 MeV.
  • Gamma rays create interfering signals in these detectors.
  • Distinguishing neutron and gamma events by pulse rise time is challenging with conventional analogue electronics.

Purpose of the Study:

  • To develop and evaluate a digital sampling system for improved neutron spectroscopy.
  • To overcome the complexity of analogue systems for pulse shape discrimination.
  • To compare the performance of a digital system with conventional analogue methods.

Main Methods:

  • Utilized a digital sampling system and custom software to acquire amplitude and rise time data from SP2 counters.
  • Employed Monte Carlo simulations to support data interpretation.
  • Compared the digital system's performance against a conventional 1-parameter analogue system.

Main Results:

  • The digital system successfully measured amplitude and rise time data.
  • Demonstrated the potential for distinguishing neutron and gamma ray events.
  • Provided a performance comparison between digital and analogue techniques.

Conclusions:

  • The digital sampling technique offers a viable and potentially simpler alternative to conventional analogue systems for neutron spectroscopy.
  • Further development of digital methods could enhance the capabilities of proportional counters.
  • This approach shows promise for supplanting traditional methods in neutron detection.