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Preliminary results of Water Shielding Effect for space radiation in ISS crew cabin by means of passive dosimeters
https://repo.qst.go.jp/records/64714
https://repo.qst.go.jp/records/6471495ea4b2b-489d-4c5d-ba5b-37e9b29c28de
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2012-09-11 | |||||
| タイトル | ||||||
| タイトル | Preliminary results of Water Shielding Effect for space radiation in ISS crew cabin by means of passive dosimeters | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Kodaira, Satoshi
× Kodaira, Satoshi× Tolochek, Raisa× Ambrozova, Iva× Kawashima, Hajime× Yasuda, Nakahiro× Kurano, Mieko× Kitamura, Hisashi× Uchihori, Yukio× Kobayashi, Ikuo× Suzuki, Atuto× Nikolaev, I.V.× Shurshakov, V.A.× et.al× 小平 聡× 川嶋 元× 蔵野 美恵子× 北村 尚× 内堀 幸夫× 鈴木 厚人 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Measurements of absorbed dose during manned space missions such as International Space Station (ISS) at low earth orbit (LEO) are important for evaluating radiation risk of astronauts in complicated space radiation environment, in which a lot kind of charged particles with various energy and composition are filled. The linear energy transfer (LET) with such particles is widely ranging from ~ 0.1 to 1000 keV/um. The precise measurements of LET with extremely wide range are required to validly evaluate the personal dose for the protection from space radiations. ISS crew is constantly exposed to space radiation of daily dose of 0.5 ~ 1 mSv. The effective dose limits (10 yr career) for Astronauts are recommended to be 400 mSv (female) and 700 mSv (male) for 25 yrs old. At the current status, the adiation protection on ISS is depending on the shielding effect with vehicle wall and some instruments. However, a possible "active" radiation protection should be verified for not only re-duction of integrated dose but also coming long-term missions at Lunar and Mars. In this study, we verified the dose reduction rate for space radiation by the addi-tional installation of water shielding (the hygienic wipes and towels containing water) in ISS crew cabin. The dose reduction rate for space ra-diation by the additional installation of water shielding was measured with the passive dosimeter packages consisting of thermoluminescence detector (TLDs) and CR-39 plastic nuclear track detectors (PNTD). The water shielding was stored into the protective curtain at 4 layers, which is corresponding to the additional shielding thickness of about 8 g/cm^2. The total mass of the protective curtain was to be 65 kg. That was in-stalled along the outer wall of the starboard crew cabin in Russian Service Module. The dose reduction effect by water shielding was experimentally measured with the totally 12 passive dosimeter packages. Half of packages were located on the protective curtain sur-face and the other half packages were located on the crew cabin wall behind or aside the protective curtain. Two experiments for different duration were carried out onboard ISS crew cabin, Session#1: from June 16 to November 26, 2010 (163 days) and Session#2: from December 15, 2010 to May 24, 2011 (160 days). The mean absorbed dose rate and dose equivalent rate are 224 uGy/day and 575 uSv/day for the shielded side and 327 uGy/day and 821 uSv/day for the unshielded side during Session#1. The observed dose reduction rate by the additional water shielding material through two durations was found to be ranging from 15 to 44 % in dose equivalent depending on the material thickness. The observed data was compared with the calculation by PHITS code. The calculated reduction rate of ~36% for 8 g/cm^2 water shielding is roughly consistent with the observation. The dose reduction rate for space radia-tion by the additional installation of water shielding in ISS crew cabin was measured with the passive dosime-ter packages consisting of TLD and CR-39 during two different durations (Session#1 and #2). The observed dose reduction of 15 ~ 44 % in dose equivalent was roughly consistent with the calculation. The properly utilization of protective curtain will effectively reduce the radiation dose for crew living in space station and more long-term mission in the future. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 17th WRMISS Workshop | |||||
| 発表年月日 | ||||||
| 日付 | 2012-09-06 | |||||
| 日付タイプ | Issued | |||||
