Radiation dosimetry measurements with real time radiation monitoring device (RRMD)-II in space shuttle STS-79

Takao Sakaguchi, Tadayoshi Doke, Takayoshi Hayashi, Jun Kikuchi, Nobuyuki Hasebe, Toshisuke Kashiwagi, Takeshi Takashima, Kenichi Takahashi, Tamotsu Nakano, Shunji Nagaoka, Shimpei Takahashi, Hisashi Yamanaka, Katsumi Yamaguchi, Gautam D. Badhwar

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The real-time measurement of radiation environment was made with an improved real-time radiation monitoring device (RRMD)-II onboard Space Shuttle STS-79 (S/MM#4: 4th Shuttle MIR Mission, at an inclination angle of 51.6° and an altitude of 250-400 km) for 199 h during 17-25 September, 1996. The observation of the detector covered the linear energy transfer (LET) range of 3.5-6000 keV/μm. The Shuttle orbital profile in this mission was equivalent to that of the currently planned Space Station, and provided an opportunity to investigate variations in count rate and dose equivalent rate depending on altitude, longitude, and latitude in detail. Particle count rate and dose equivalent rate were mapped geographically during the mission. Based on the map of count rate, an analysis was made by dividing whole region into three regions: South Atlantic Anomaly (SAA) region, high latitude region and other regions. The averaged absorbed dose rate during the mission was 39.3 μGy/day for a LET range of 3.5-6000 keV/μm. The corresponding average dose equivalent rates during the mission are estimated to be 293 μSv/day with quality factors from International Commission on Radiological Protection (ICRP)-Pub. 60 and 270 μSv/day with quality factors from ICRP-Pub. 26. The effective quality factors for ICRP-Pub. 60 and 26 are 7.45 and 6.88, respectively. From the present data for particles of LET > 3.5keV/μm, we conclude that the average dose equivalent rate is dominated by the contribution of galactic cosmic ray (GCR) particles. The dose-detector depth dependence was also investigated.

Original languageEnglish
Pages (from-to)7453-7459
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume36
Issue number12 A
Publication statusPublished - 1997 Dec
Externally publishedYes

Keywords

  • Dose equivalent
  • Radiation environment
  • Real-time monitor
  • Space radiation
  • Space shuttle

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Engineering(all)

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  • Cite this

    Sakaguchi, T., Doke, T., Hayashi, T., Kikuchi, J., Hasebe, N., Kashiwagi, T., Takashima, T., Takahashi, K., Nakano, T., Nagaoka, S., Takahashi, S., Yamanaka, H., Yamaguchi, K., & Badhwar, G. D. (1997). Radiation dosimetry measurements with real time radiation monitoring device (RRMD)-II in space shuttle STS-79. Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, 36(12 A), 7453-7459.