A neutron gamma detector with high dynamic range and temporal resolution

By designing a multilayer neutron moderator and neutron/gamma sensitive scintillator array, combined with photomultiplier tubes and preamplifier arrays, the problem of signal saturation in traditional detectors was solved, achieving a high count rate and improved dynamic range, making it suitable for neutron and gamma measurements in fusion experiments.

CN120762080BActive Publication Date: 2026-06-23SOUTHWESTERN INST OF PHYSICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWESTERN INST OF PHYSICS
Filing Date
2025-07-29
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Traditional neutron gamma detectors are prone to signal saturation under high count rate conditions, making it difficult to achieve sub-millisecond time resolution and dynamic range, thus failing to meet the high-intensity radiation field measurement requirements in fusion experiments.

Method used

A multilayer neutron moderator and neutron/gamma sensitive scintillator array, combined with a photomultiplier tube and a preamplifier array, are used to form the gradient response matrix of the detector. By increasing the number of scintillators and layers, the count rate and dynamic range are improved.

Benefits of technology

It achieves improved time resolution (≤0.1ms) and dynamic range, is suitable for neutron and gamma count rate measurement in high-intensity radiation fields, avoids signal saturation, has neutron energy spectrum measurement capability, and is insensitive to magnetic fields.

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Abstract

The application discloses a neutron gamma detector with high dynamic range and time resolution, comprising: a plurality of layers of detection units, a plurality of neutron moderators and a detector shell; each detection unit is arranged along the axis of the detector shell, and a neutron moderator is arranged between each detection unit; the detection unit comprises a neutron / gamma sensitive scintillator array, a photomultiplier tube array and a preamplifier array, and each layer of neutron / gamma sensitive scintillator array is matched with one layer of photomultiplier tube array and one layer of preamplifier array. The detector utilizes the multiple layers of neutron moderators to form the gradient of the neutron and gamma ray detection efficiency of each layer of scintillator, the neutron / gamma sensitive scintillator array matched with the photomultiplier tube array and the preamplifier array can measure and obtain a pulse count matrix, and then the neutron and gamma count rate at each layer of detector can be extracted. Meanwhile, the time resolution and dynamic range are improved based on the structural design of the detector.
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