Measurements of LET Distribution and Dose Equivalent onboard the Space Shuttle IML-2 (STS-65) and S/MM#4 (STS-79).

• Hayashi Takayoshi

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Doke Tadayoshi

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Kikuchi Jun

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Sakaguchi Takao

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Takeuchi Ryuichi

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Takashima Takeshi

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Kobayashi Masanori

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Terasawa Kazuhiro

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Takahashi Kenichi

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Kyan Atsushi

  Advanced Research Center for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169, Japan;

• Hasebe Nobuyuki

  Department of Computer Science, Ehime University, Bunkyo-cho 3, Matsuyama, Ehime 790, Japan;

• Kashiwagi Toshisuke

  Department of Business and Engineering, Kanagawa University, Rokkakubashi 3-27-l, Kanagawa-ku, Yokohama 221, Japan;

• Ogura Koichi

  College of Industrial Technology, Nihon University, Izumi-cho 1-2-1, Narashino, Chiba 275, Japan;

• Nagaoka Shunji

  Tsukuba Space Center, NASDA, Sengen 2-1-1, Tsukuba, Ibaraki 305, Japan;

• Kato Mitsuyasu

  Tsukuba Space Center, NASDA, Sengen 2-1-1, Tsukuba, Ibaraki 305, Japan;

• Nakano Tamotsu

  Tsukuba Space Center, NASDA, Sengen 2-1-1, Tsukuba, Ibaraki 305, Japan;

• Takahashi Shimpei

  Tsukuba Space Center, NASDA, Sengen 2-1-1, Tsukuba, Ibaraki 305, Japan;

• Yamanaka Hisashi

  Japan Space Utilization Promotion Center, Nishiwaseda 3-30-16, Shinjuku-ku, Tokyo 169, Japan; and

• Yamaguchi Katsumi

  Japan Space Utilization Promotion Center, Nishiwaseda 3-30-16, Shinjuku-ku, Tokyo 169, Japan; and

• D. Badhwar Gautam

  NASA Johnson Space Center, Houston, TX 77058, U.S.A.

書誌事項

タイトル別名

• Measurements of LET Distribution and Do

抄録

Space radiation dosimetry measurements have been made onboard the Space Shuttle STS-65 in the Second International Microgravity Laboratory (IML-2: 28.5° x 300 km: 14.68 days) and the STS-79 in the 4th Shuttle MIR mission (S⁄MM#4: 51.6° x 300-400 km: 10.2 days). In these measurements, three kinds of detectors were used; one is a newly developed active detector telescope called “Real-time Radiation Monitoring Device (RRMD-I for IML-2 and RRMD-II with improved triggering system for S⁄MM#4)“ utilizing silicon semi-conductor detectors and the other detectors are conventional passive detectors of thermoluminescence dosimeters (TLDs) and CR-39 plastic track detectors. The main contribution to dose equivalent for particles with LET > 5.0 keV⁄μm(IML-2) and LET>3.5. keV⁄μm (S⁄MM#4) is seen to be due to galactic cosmic rays (GCRs) and the contribution of the South Atlantic Anomaly (SAA) is less than 5%(IML-2: 28.5° x 300 km) and 15% (S⁄MM#4: 51.6° x 400 km) in the above RRMD LET detection conditions. For the whole LET range (> 0.2 keV⁄μm) obtained by TLDs and CR-39 in these two typical orbits (a small inclination x low altitude and a large inclination x high altitude), absorbed dose rates range from 94 to 114 μGy⁄day, dose equivalent rates from 186 to 207μSv⁄day and average quality factors from 1.82 to 2.00 depending on the locations and directions of detectors inside the Spacelab at the highly protected IML-2 orbit (28.5°x 300 km) , and also, absorbed dose rates range from 290 to 367 μGy⁄day, dose equivalent rates from 582 to 651 μSv⁄day and average quality factors from l.78 to 2.01 depending on the dosimeter packages around the RRMD-II “Detector Unit” at the S⁄MM#4 orbit (51.6° x 400 km). In general, it is seen that absorbed doses depend on the orbit altitude (SAA trapped particles contribution dominant) and dose equivalents on the orbit inclination (GCR contribution dominant). The LET distributions obtained by two different types of active and passive detectors, RRMDs and CR-39, are in good agreement for LET of 15 - 200 keV⁄μm and difference of these distributions in the regions of LET<15 keV/μm and LET >200 keV⁄μm can be explained by considering characteristics of CR-39 etched track formation especially for the low LET tracks and chemical etching conditions.

収録刊行物

• Ｂｉｏｌｏｇｉｃａｌ　Ｓｃｉｅｎｃｅｓ　ｉｎ　Ｓｐａｃｅ

  Ｂｉｏｌｏｇｉｃａｌ　Ｓｃｉｅｎｃｅｓ　ｉｎ　Ｓｐａｃｅ 11 (4), 355-364, 1997

  日本宇宙生物科学会

キーワード

• 4th Shuttle MIR mission

詳細情報

• CRID: 1390001204431698944
• NII論文ID: 130004450437
• NII論文ID: 10002857024
• NII書誌ID: AN10164806
• DOI: 10.2187/bss.11.355
• ISSN: 1349967X
• ISSN: 09149201
• NDL書誌ID: 4562996
• PubMed: 11541770
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4562996
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • PubMed
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可