LET distributions from CR-39 plates on Space Shuttle missions STS-84 and STS-91 and a comparison of the results of the CR-39 plates with those of RRMD-II and RRMD-III telescopes

H. Tawara, T. Doke, T. Hayashi, J. Kikuchi, A. Kyan, S. Nagaoka, T. Nakano, S. Takahashi, Kazuhiro Terasawa, E. Yoshihira

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The LET distributions during the Space Shuttle missions STS-84 (altitude 270-412 km, average 375 km; inclination angle, 51.6°) and STS-91 (altitude 328-397 km, average 373 km; inclination angle, 51.6°) were measured using CR-39 plastic nuclear track detectors. A correction for the dip-angle dependence of the track-formation sensitivity of the CR-39 plates was applied to the data analysis. The absorbed doses and the dose equivalents around RRMD Detector Units, estimated from the LET distributions in the LET region of 4-200 keV/μm, fluctuated with standard deviations of ±21% to ±35% in both flight experiments. The LET distributions obtained from the CR-39 plates agreed well with that obtained from RRMD-II in STS-91. However, the particle fluxes obtained from RRMD-III in STS-84 and STS-91 were two or three times higher than those obtained from RRMD-II and the CR-39 plates. It was concluded that the LET distributions obtained from RRMD-II and the CR-39 plates in the present flight experiments did not include the contribution of target-fragmented secondary heavy particles produced by low-LET particles, such as relativistic or semi-relativistic protons and helium ions, whereas RRMD-III was able to detect these secondary particles because of its low triggering level.

Original languageEnglish
Pages (from-to)119-126
Number of pages8
JournalRadiation Measurements
Volume35
Issue number2
Publication statusPublished - 2002
Externally publishedYes

Fingerprint

Space Shuttle missions
space transportation system
Space shuttles
Telescopes
telescopes
Detectors
Helium
Protons
Experiments
inclination
Fluxes
Plastics
flight
Ions
dosage
helium ions
detectors
flux (rate)
standard deviation
plastics

ASJC Scopus subject areas

  • Radiation

Cite this

LET distributions from CR-39 plates on Space Shuttle missions STS-84 and STS-91 and a comparison of the results of the CR-39 plates with those of RRMD-II and RRMD-III telescopes. / Tawara, H.; Doke, T.; Hayashi, T.; Kikuchi, J.; Kyan, A.; Nagaoka, S.; Nakano, T.; Takahashi, S.; Terasawa, Kazuhiro; Yoshihira, E.

In: Radiation Measurements, Vol. 35, No. 2, 2002, p. 119-126.

Research output: Contribution to journalArticle

Tawara, H, Doke, T, Hayashi, T, Kikuchi, J, Kyan, A, Nagaoka, S, Nakano, T, Takahashi, S, Terasawa, K & Yoshihira, E 2002, 'LET distributions from CR-39 plates on Space Shuttle missions STS-84 and STS-91 and a comparison of the results of the CR-39 plates with those of RRMD-II and RRMD-III telescopes', Radiation Measurements, vol. 35, no. 2, pp. 119-126.
Tawara, H. ; Doke, T. ; Hayashi, T. ; Kikuchi, J. ; Kyan, A. ; Nagaoka, S. ; Nakano, T. ; Takahashi, S. ; Terasawa, Kazuhiro ; Yoshihira, E. / LET distributions from CR-39 plates on Space Shuttle missions STS-84 and STS-91 and a comparison of the results of the CR-39 plates with those of RRMD-II and RRMD-III telescopes. In: Radiation Measurements. 2002 ; Vol. 35, No. 2. pp. 119-126.
@article{19d7f0bdcc1f4a1c8fd8ffd5dfbd81d1,
title = "LET distributions from CR-39 plates on Space Shuttle missions STS-84 and STS-91 and a comparison of the results of the CR-39 plates with those of RRMD-II and RRMD-III telescopes",
abstract = "The LET distributions during the Space Shuttle missions STS-84 (altitude 270-412 km, average 375 km; inclination angle, 51.6°) and STS-91 (altitude 328-397 km, average 373 km; inclination angle, 51.6°) were measured using CR-39 plastic nuclear track detectors. A correction for the dip-angle dependence of the track-formation sensitivity of the CR-39 plates was applied to the data analysis. The absorbed doses and the dose equivalents around RRMD Detector Units, estimated from the LET distributions in the LET region of 4-200 keV/μm, fluctuated with standard deviations of ±21{\%} to ±35{\%} in both flight experiments. The LET distributions obtained from the CR-39 plates agreed well with that obtained from RRMD-II in STS-91. However, the particle fluxes obtained from RRMD-III in STS-84 and STS-91 were two or three times higher than those obtained from RRMD-II and the CR-39 plates. It was concluded that the LET distributions obtained from RRMD-II and the CR-39 plates in the present flight experiments did not include the contribution of target-fragmented secondary heavy particles produced by low-LET particles, such as relativistic or semi-relativistic protons and helium ions, whereas RRMD-III was able to detect these secondary particles because of its low triggering level.",
author = "H. Tawara and T. Doke and T. Hayashi and J. Kikuchi and A. Kyan and S. Nagaoka and T. Nakano and S. Takahashi and Kazuhiro Terasawa and E. Yoshihira",
year = "2002",
language = "English",
volume = "35",
pages = "119--126",
journal = "Radiation Measurements",
issn = "1350-4487",
publisher = "Elsevier Limited",
number = "2",

}

TY - JOUR

T1 - LET distributions from CR-39 plates on Space Shuttle missions STS-84 and STS-91 and a comparison of the results of the CR-39 plates with those of RRMD-II and RRMD-III telescopes

AU - Tawara, H.

AU - Doke, T.

AU - Hayashi, T.

AU - Kikuchi, J.

AU - Kyan, A.

AU - Nagaoka, S.

AU - Nakano, T.

AU - Takahashi, S.

AU - Terasawa, Kazuhiro

AU - Yoshihira, E.

PY - 2002

Y1 - 2002

N2 - The LET distributions during the Space Shuttle missions STS-84 (altitude 270-412 km, average 375 km; inclination angle, 51.6°) and STS-91 (altitude 328-397 km, average 373 km; inclination angle, 51.6°) were measured using CR-39 plastic nuclear track detectors. A correction for the dip-angle dependence of the track-formation sensitivity of the CR-39 plates was applied to the data analysis. The absorbed doses and the dose equivalents around RRMD Detector Units, estimated from the LET distributions in the LET region of 4-200 keV/μm, fluctuated with standard deviations of ±21% to ±35% in both flight experiments. The LET distributions obtained from the CR-39 plates agreed well with that obtained from RRMD-II in STS-91. However, the particle fluxes obtained from RRMD-III in STS-84 and STS-91 were two or three times higher than those obtained from RRMD-II and the CR-39 plates. It was concluded that the LET distributions obtained from RRMD-II and the CR-39 plates in the present flight experiments did not include the contribution of target-fragmented secondary heavy particles produced by low-LET particles, such as relativistic or semi-relativistic protons and helium ions, whereas RRMD-III was able to detect these secondary particles because of its low triggering level.

AB - The LET distributions during the Space Shuttle missions STS-84 (altitude 270-412 km, average 375 km; inclination angle, 51.6°) and STS-91 (altitude 328-397 km, average 373 km; inclination angle, 51.6°) were measured using CR-39 plastic nuclear track detectors. A correction for the dip-angle dependence of the track-formation sensitivity of the CR-39 plates was applied to the data analysis. The absorbed doses and the dose equivalents around RRMD Detector Units, estimated from the LET distributions in the LET region of 4-200 keV/μm, fluctuated with standard deviations of ±21% to ±35% in both flight experiments. The LET distributions obtained from the CR-39 plates agreed well with that obtained from RRMD-II in STS-91. However, the particle fluxes obtained from RRMD-III in STS-84 and STS-91 were two or three times higher than those obtained from RRMD-II and the CR-39 plates. It was concluded that the LET distributions obtained from RRMD-II and the CR-39 plates in the present flight experiments did not include the contribution of target-fragmented secondary heavy particles produced by low-LET particles, such as relativistic or semi-relativistic protons and helium ions, whereas RRMD-III was able to detect these secondary particles because of its low triggering level.

UR - http://www.scopus.com/inward/record.url?scp=0036008113&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036008113&partnerID=8YFLogxK

M3 - Article

C2 - 11841106

AN - SCOPUS:0036008113

VL - 35

SP - 119

EP - 126

JO - Radiation Measurements

JF - Radiation Measurements

SN - 1350-4487

IS - 2

ER -