LET distribution measurement with a new real-time radiation monitoring device-III onboard the Space Shuttle STS-84

T. Sakaguchi*, T. Doke, Nobuyuki Hasebe, T. Hayashi, T. Kashiwagi, J. Kikuchi, S. Kono, S. Nagaoka, T. Nakano, T. Takagi, K. Takahashi, S. Takahashi

*この研究の対応する著者

研究成果: Article査読

34 被引用数 (Scopus)

抄録

A new type of Real-time Radiation Monitoring Device, RRMD-III, consisting of three double-sided silicon strip detectors (DSSDs) has been constructed and used onboard the Space Shuttle mission STS-84. The Space Shuttle cruised at an altitude of 300-400 km and an inclination angle of 51.6° for 221.3 h. RRMD-III succeeded in measuring the linear energy transfer (LET) distribution over the range of 0.2-600 keV/μm for 178 h. The obtained LET distribution of particles was investigated in detail by classifying it into galactic cosmic ray (GCR) particles and trapped protons in the South Atlantic Anomaly (SAA) region. The result shows that GCR particles contribute 60% to the total dose equivalent. The total absorbed dose rate during the mission was 0.516 mGy/day, the effective quality factor was 1.81 by ICRP-Pub.26, and the dose equivalent rate was 0.935 mSv/day. The average absorbed dose rates are 0.120 μGy/min for GCR particles and 4.80 μGy/min for trapped protons. The effective quality factors are 3.16 for GCR particles and 1.19 for trapped protons. RRMD-III data were also compared with the data of the tissue equivalent proportional counter (TEPC), proving that RRMD-III is a reliable device for deriving the true-LET distribution in real time for evaluating space radiation.

本文言語English
ページ(範囲)75-87
ページ数13
ジャーナルNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
437
1
DOI
出版ステータスPublished - 1999 11月 11
外部発表はい

ASJC Scopus subject areas

  • 器械工学
  • 核物理学および高エネルギー物理学

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