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<p>Radiation exposure presents a significant challenge for long-duration crewed space missions due to its adverse effects on both biological tissues and onboard electronics. Real-time, tissue-equivalent personal dosimeters are essential for effective monitoring and mitigation of space radiation risk, especially in environments dominated by galactic cosmic rays (GCRs) and solar particle events (SPEs). In this work, a miniature, low-power, wearable dosimeter based on a 4&#xa0;H-SiC/Pd Schottky detector has been developed by LEOS for India’s Gaganyaan manned space mission. The device was calibrated using a <sup>60</sup>Co gamma radiation source, and tested with an alpha emitter (<sup>241</sup>Am) for its performance evaluation. The dosimeter demonstrates low noise (0.5 µGy resolution), and a wide dynamic range (0.5 µGy hr⁻¹ to 5.5&#xa0;Gy hr⁻¹), making it suitable for both low-Earth orbit and deep space missions. The present dosimeter achieved volume-normalized sensitivity of 7.8 × 10<sup>5</sup> nCGy<sup>− 1</sup>cm<sup>− 3</sup> which is higher than other dosimeters based on silicon, diamond, or carbon nanotubes.</p>

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A button-sized wearable dosimeter for astronaut radiation exposure monitoring in real-time

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • M. A. Sumesh,
  • J. Sirisha,
  • S. P. Karanth

摘要

Radiation exposure presents a significant challenge for long-duration crewed space missions due to its adverse effects on both biological tissues and onboard electronics. Real-time, tissue-equivalent personal dosimeters are essential for effective monitoring and mitigation of space radiation risk, especially in environments dominated by galactic cosmic rays (GCRs) and solar particle events (SPEs). In this work, a miniature, low-power, wearable dosimeter based on a 4 H-SiC/Pd Schottky detector has been developed by LEOS for India’s Gaganyaan manned space mission. The device was calibrated using a 60Co gamma radiation source, and tested with an alpha emitter (241Am) for its performance evaluation. The dosimeter demonstrates low noise (0.5 µGy resolution), and a wide dynamic range (0.5 µGy hr⁻¹ to 5.5 Gy hr⁻¹), making it suitable for both low-Earth orbit and deep space missions. The present dosimeter achieved volume-normalized sensitivity of 7.8 × 105 nCGy− 1cm− 3 which is higher than other dosimeters based on silicon, diamond, or carbon nanotubes.