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Related Experiment Video

Updated: Oct 12, 2025

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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Low dose rate γ-ray detection using a MAPS camera under a neutron radiation environment.

Shoulong Xu, Fang Zhao, Yang Zou

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    |November 23, 2021
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    This study demonstrates a monolithic active pixel sensor (MAPS) camera effectively detects gamma rays in neutron fields. The camera shows sensitivity to neutrons and single photons, with pixel signal counts indicating radiation dose rate.

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    Area of Science:

    • Nuclear instrumentation and radiation detection.
    • Sensor technology for extreme environments.

    Background:

    • Accurate radiation detection is crucial in complex nuclear environments, often involving mixed neutron and gamma-ray fields.
    • Traditional detectors may require specialized shielding or conversion layers, complicating integration into systems like robotics.

    Purpose of the Study:

    • To evaluate the capability of a monolithic active pixel sensor (MAPS) camera for gamma-ray detection within a neutron radiation environment.
    • To assess the sensor's sensitivity to neutrons and single photons without additional shielding or conversion materials.
    • To identify key sensor response metrics for quantifying radiation dose rates.

    Main Methods:

    • Utilized a monolithic active pixel sensor (MAPS) camera directly in a mixed neutron and gamma-ray radiation field.
    • Analyzed the sensor's output signal, comprising pedestal, noise, and radiation response.
    • Correlated the number of pixels exceeding a specific signal threshold (100) with the radiation dose rate.

    Main Results:

    • The MAPS camera demonstrated sensitivity to both neutrons and individual photons.
    • The sensor's output signal was a composite of inherent sensor characteristics and the radiation response.
    • A strong correlation was observed between the dose rate and the count of pixels with signals above 100, identifying it as a reliable indicator.

    Conclusions:

    • Monolithic active pixel sensor (MAPS) cameras can function as effective radiation detection sensors in mixed-field environments.
    • The technology offers a viable solution for radiation monitoring in robotic systems, reducing human exposure and error.
    • The proposed method provides an efficient means for dose rate estimation using pixel signal counts.