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Background <p>Neutron detection in intense pulsed radiation fields from high-energy particle accelerators remains a significant challenge. As beam energy and intensity continue to increase, conventional neutron rem counters face saturation issues, leading to significant counting losses during measurements.</p> Purpose <p>Neutron rem counters still effectively measure radiation fields in particle accelerators. To address their counting loss limitations, an integrated detection system is proposed to supersede conventional counting methodology.</p> Methods <p>Pulsed neutron bursts are measured using the integrated charge from neutron-induced nuclear reactions for calibration. The proportional counter acts as a weak current source, with the nuclear reaction signal read from the cathode, allowing integration into the measurement chain. The front-end electronics feature an amplification circuit sensitive to low currents, with a sensitivity range of 100 pA–1.0&#xa0;mA, response time of less than 10&#xa0;μs at 1.0 μA, and minimum detectable charge of approximately 200 fC. The digital processing system utilizes a Redpitaya 125–14 board, communicating with a host computer via SCPI commands through the LabVIEW platform.</p> Results <p>Comparative experiments were conducted in neutron radiation fields at the Hefei Ion Medical Center and Beijing Electron–Positron Collider II. Results showed that in uniform neutron fields with dose rates ranging from several μSv/h to tens of mSv/h, measurements from the integrated rem counter closely matched those from the counting-based rem counter, with deviations of less than 10%. In pulsed neutron fields, the integrated system measured real-time dose rates of neutron bursts up to 51&#xa0;mSv/h and successfully resolved the temporal structure of neutron-induced nuclear reactions.</p> Conclusion <p>The feasibility of applying an integrated detection approach to neutron rem counters is verified, and results are consistent with theoretical expectations. This methodology can meet future demands for pulsed neutron dose measurements in national scientific facilities.</p>

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Measurement of intense pulsed neutron radiation dose based on nuclear reaction charge calibration

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Ming-Yang Yan,
  • Nan Gao,
  • Yin-Hong Zhang,
  • Zhong-Jian Ma,
  • Zheng Wang,
  • Weimin Li,
  • Qing-Bin Wang

摘要

Background

Neutron detection in intense pulsed radiation fields from high-energy particle accelerators remains a significant challenge. As beam energy and intensity continue to increase, conventional neutron rem counters face saturation issues, leading to significant counting losses during measurements.

Purpose

Neutron rem counters still effectively measure radiation fields in particle accelerators. To address their counting loss limitations, an integrated detection system is proposed to supersede conventional counting methodology.

Methods

Pulsed neutron bursts are measured using the integrated charge from neutron-induced nuclear reactions for calibration. The proportional counter acts as a weak current source, with the nuclear reaction signal read from the cathode, allowing integration into the measurement chain. The front-end electronics feature an amplification circuit sensitive to low currents, with a sensitivity range of 100 pA–1.0 mA, response time of less than 10 μs at 1.0 μA, and minimum detectable charge of approximately 200 fC. The digital processing system utilizes a Redpitaya 125–14 board, communicating with a host computer via SCPI commands through the LabVIEW platform.

Results

Comparative experiments were conducted in neutron radiation fields at the Hefei Ion Medical Center and Beijing Electron–Positron Collider II. Results showed that in uniform neutron fields with dose rates ranging from several μSv/h to tens of mSv/h, measurements from the integrated rem counter closely matched those from the counting-based rem counter, with deviations of less than 10%. In pulsed neutron fields, the integrated system measured real-time dose rates of neutron bursts up to 51 mSv/h and successfully resolved the temporal structure of neutron-induced nuclear reactions.

Conclusion

The feasibility of applying an integrated detection approach to neutron rem counters is verified, and results are consistent with theoretical expectations. This methodology can meet future demands for pulsed neutron dose measurements in national scientific facilities.