タイトル（掲載誌）宇宙航空研究開発機構特別資料 = JAXA Special Publication
一般注記The Extraterrestrial Sample Curation Center of JAXA receives samples returned by asteroidal explorer. Such returned samples are handled by meticulously cleaned tools in the nitrogen-circulation-type clean chamber to prevent contamination from earth materials. In May 2022, two new glove boxes (GB6 and GB7) were installed to our curation facility for the storage of samples returned from initial analyses of Hayabusa2, and general sample handling in highpurity nitrogen respectively. These glove boxes were confirmed to have the same level of cleanliness as GB1 from the results of the contamination analyses. New ISO Class 6 clean room (ISO-14644-1), clean chambers and glove boxes have also been designed for receiving the samples from the OSIRIS-REx mission returning to Earth in 2023. Human activity, tools and construction work are the risk to introduce the contaminants into the clean room and clean chambers. To ensure that extraterrestrial samples are maintained in a clean environment, it is essential to continuously monitor the cleanliness of clean rooms, clean chambers, and glove boxes in which samples are processed and stored. Thus, in this study, we employ results of annual contamination analyses to assess the cleanliness level of the environment where the samples were processed and stored based on ISO standards (ISO-14644-8, ISO-14644-10), and it was confirmed that the cleanliness level is kept until 2022 even after the Ryugu samples were returned and processed. Cultivation-based microbial contamination analysis of both clean rooms and clean chambers detected no microorganisms. In February 2022, comprehensive two-dimensional gas chromatography Time-Of-Flight Mass Spectrometer was introduced in our group, which enabled analysis of organic substances in our laboratory. It has become possible to obtain organic materials data that interpolate environmental evaluation that are outsourced to outside contractors, which can only be performed once or twice a year. The results of GC analysis indicated the increase of organics in the adjacent clean room after starting the new clean room construction.
形態: カラー図版あり
Physical characteristics: Original contains color illustrations
資料番号: AA2230020000
レポート番号: JAXA-SP-22-006E
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
提供元機関・データベース宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ