{"_buckets": {"deposit": "bc638d2d-0b13-410b-bc67-a02f119d3b86"}, "_deposit": {"id": "28149", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "28149"}, "status": "published"}, "_oai": {"id": "oai:niigata-u.repo.nii.ac.jp:00028149", "sets": ["456", "1575"]}, "item_7_alternative_title_1": {"attribute_name": "その他のタイトル", "attribute_value_mlt": [{"subitem_alternative_title": "Fundamental experiments for measurements of environmental tritium with a low-background liquid scintillation spectrometer : Background counting"}]}, "item_7_biblio_info_6": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1986-12", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "89", "bibliographicPageStart": "81", "bibliographicVolumeNumber": "8", "bibliographic_titles": [{"bibliographic_title": "新潟大学積雪地域災害研究センター研究年報"}, {"bibliographic_title": "新潟大学積雪地域災害研究センター研究年報", "bibliographic_titleLang": "en"}]}]}, "item_7_description_4": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "It is well known that the detection of tritium is fairly difficult to determine by an ordinary liquid scintillation technique without electrolytic enrichment or a special detector designed for low level radioactivity measurement because the tritium content in such an environment is extremely low. As a low-background liquid scintillation spectrometer (Aloka\u0027s LSC-LB1) has been installed in our laboratory, some fundamental experiments have been performed prior to the measurements of environmental tritium. Results obtained are as follows: i) The background counting rate can be lowered by the measurements of sample vials under a nitrogen atmosphere (Figs. 1 and 2). It indicates that a part of the background counting rate consists of light emission based on alpha-decays of Rn-daughters in the air. ii) When the counting of a background water sample was successively repeated, the background counting rates obviously fluctuated with time, giving the highest background value immediately after the beginning of the measurement (Fig. 2). It was found that the measurement of background samples should be frequently required to obtain an practical measurements with a high degree of accuracy. iii) A teflon vial of 100ml can load easily an electrostatic charge by the friction due to surrounding air during the operation of a sample change. Although the electrostatic charge of a vial certainly causes the anomalous counts, it was also confirmed the influence can be reduced by the use of an antistatic agent for the vial (Figs. 2, 3 and 4). iv) The measurement of the external standard channel ratio (abbreviated to ESCR) was successively repeated. As the ESCR-values fluctuate and increase until about the 100th measurement from the beginning (Fig. 5), the employment of the ESCR-values around the 100th measurement run seems most recommendable to obtain the most precise counting efficiency.", "subitem_description_type": "Abstract"}]}, "item_7_full_name_3": {"attribute_name": "著者別名", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "161802", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "Nakagawa, Takao"}]}, {"nameIdentifiers": [{"nameIdentifier": "161803", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "Sato, Osamu"}]}, {"nameIdentifiers": [{"nameIdentifier": "161804", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "Hashimoto, Tetsuo"}]}]}, "item_7_publisher_7": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "新潟大学積雪地域災害研究センター"}]}, "item_7_select_19": {"attribute_name": "著者版フラグ", "attribute_value_mlt": [{"subitem_select_item": "publisher"}]}, "item_7_source_id_11": {"attribute_name": "書誌レコードID", "attribute_value_mlt": [{"subitem_source_identifier": "AN00183327", "subitem_source_identifier_type": "NCID"}]}, "item_7_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "03877892", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "仲川, 隆夫"}], "nameIdentifiers": [{"nameIdentifier": "161799", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "佐藤, 修"}], "nameIdentifiers": [{"nameIdentifier": "161800", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "橋本, 哲夫"}], "nameIdentifiers": [{"nameIdentifier": "161801", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2019-08-20"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "8_81-89.pdf", "filesize": [{"value": "570.0 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 570000.0, "url": {"label": "8_81-89.pdf", "url": "https://niigata-u.repo.nii.ac.jp/record/28149/files/8_81-89.pdf"}, "version_id": "d2f164f8-b033-40ec-958a-f0c26041e2b0"}]}, "item_keyword": {"attribute_name": "キーワード", "attribute_value_mlt": [{"subitem_subject": "Liquid scintillation tecnique", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Background counting", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Environmental tritium", "subitem_subject_scheme": "Other"}, {"subitem_subject": "External standard channel ratio", "subitem_subject_scheme": "Other"}, {"subitem_subject": "液体シンチレーション計測", "subitem_subject_scheme": "Other"}, {"subitem_subject": "バックグラウンド計数", "subitem_subject_scheme": "Other"}, {"subitem_subject": "環境トリチウム", "subitem_subject_scheme": "Other"}, {"subitem_subject": "外部標準チャネル比", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "jpn"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "低バックグラウンド液体シンチレーションカウンターによる環境トリチウム測定の基礎研究 : バックグラウンドの検討", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "低バックグラウンド液体シンチレーションカウンターによる環境トリチウム測定の基礎研究 : バックグラウンドの検討"}, {"subitem_title": "低バックグラウンド液体シンチレーションカウンターによる環境トリチウム測定の基礎研究 : バックグラウンドの検討", "subitem_title_language": "en"}]}, "item_type_id": "7", "owner": "1", "path": ["456", "1575"], "permalink_uri": "http://hdl.handle.net/10191/39073", "pubdate": {"attribute_name": "公開日", "attribute_value": "2016-03-03"}, "publish_date": "2016-03-03", "publish_status": "0", "recid": "28149", "relation": {}, "relation_version_is_last": true, "title": ["低バックグラウンド液体シンチレーションカウンターによる環境トリチウム測定の基礎研究 : バックグラウンドの検討"], "weko_shared_id": null}