{"_buckets": {"deposit": "a886cb00-b6d4-465a-9c6d-4b5f7c9897af"}, "_deposit": {"id": "4569", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "4569"}, "status": "published"}, "_oai": {"id": "oai:nied-repo.bosai.go.jp:00004569", "sets": []}, "author_link": [], "item_10001_biblio_info_7": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2018-10", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "10", "bibliographicPageEnd": "4005", "bibliographicPageStart": "3995", "bibliographicVolumeNumber": "19", "bibliographic_titles": [{"bibliographic_title": "Geochemistry, Geophysics, Geosystems", "bibliographic_titleLang": "ja"}, {"bibliographic_title": "Geochemistry, Geophysics, Geosystems", "bibliographic_titleLang": "en"}]}]}, "item_10001_description_5": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "The helium standard of Japan, referred to as HESJ, is an interlaboratory standard for the He-3/He-4 ratio. While the ratio of He-3 and He-4 of the HESJ was previously determined by a relative comparison to atmospheric helium, the absolute value of the He-3/He-4 ratio of the HESJ has not been directly determined yet. Therefore, it relies on the early measurements of that of atmospheric helium. The accuracy of the absolute He-3/He-4 ratios of the atmosphere and other working standards including HESJ is crucial in some applications of helium isotopes, such as tritium-He-3 dating, surface-exposure age determination based on cosmogenic He-3, and the accurate measurement of the neutron lifetime. In this work, new control samples of helium gases with He-3/He-4 ratios of 14, 28, and 42ppm were fabricated with accuracy of 0.25-0.38% using a gas-handling system for a neutron lifetime experiment at Japan Proton Accelerator Research Complex. The relative He-3/He-4 ratios of these samples and the HESJ were measured using a magnetic-sector type, single-focusing, noble gas mass spectrometer with a double collector system. As a result, the absolute He-3/He-4 ratio of the HESJ was determined as 27.360.11ppm. The atmospheric He-3/He-4 ratio was determined as 1.3400.006ppm, based on this work.Helium has two isotopes, He-3 and He-4. The two isotopes have different origins. He-3 in the Earth is a vestige of that which was originally trapped during the Earth\u0027s formation, whereas He-4 generated mainly by radioactive decays of uranium and thorium has been added to primordial He-4, which means that the ratio of the two isotopes of helium can be used as a powerful tracer in geochemistry and cosmochemistry. In this work, we accurately measured the He-3/He-4 ratio of a standard calibrator by using an apparatus for a particle physics experiment and determined its value with an accuracy of 0.4%. By using the present result, the He-3/He-4 ratio of atmospheric helium was determined with best the accuracy ever than that before.", "subitem_description_language": "en", "subitem_description_type": "Other"}]}, "item_10001_publisher_8": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "AMER GEOPHYSICAL UNION", "subitem_publisher_language": "en"}]}, "item_10001_relation_14": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "10.1029/2018GC007554"}}]}, "item_10001_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "1525-2027", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Mishima K", "creatorNameLang": "ja"}, {"creatorName": "Mishima K", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Sumino H", "creatorNameLang": "ja"}, {"creatorName": "Sumino H", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Yamada T", "creatorNameLang": "ja"}, {"creatorName": "Yamada T", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Ieki S", "creatorNameLang": "ja"}, {"creatorName": "Ieki S", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Nagakura N", "creatorNameLang": "ja"}, {"creatorName": "Nagakura N", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Otono H", "creatorNameLang": "ja"}, {"creatorName": "Otono H", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Oide H", "creatorNameLang": "ja"}, {"creatorName": "Oide H", "creatorNameLang": "en"}]}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_title": "Accurate determination of the absolute 3He/4He ratio of a synthesized helium standard gas (Helium Standard of Japan, HESJ): Towards revision of the atmospheric 3He/4He ratio", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Accurate determination of the absolute 3He/4He ratio of a synthesized helium standard gas (Helium Standard of Japan, HESJ): Towards revision of the atmospheric 3He/4He ratio", "subitem_title_language": "ja"}, {"subitem_title": "Accurate determination of the absolute 3He/4He ratio of a synthesized helium standard gas (Helium Standard of Japan, HESJ): Towards revision of the atmospheric 3He/4He ratio", "subitem_title_language": "en"}]}, "item_type_id": "40001", "owner": "1", "path": ["1670839190650"], "permalink_uri": "https://nied-repo.bosai.go.jp/records/4569", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2023-03-30"}, "publish_date": "2023-03-30", "publish_status": "0", "recid": "4569", "relation": {}, "relation_version_is_last": true, "title": ["Accurate determination of the absolute 3He/4He ratio of a synthesized helium standard gas (Helium Standard of Japan, HESJ): Towards revision of the atmospheric 3He/4He ratio"], "weko_shared_id": -1}