{"created":"2023-05-15T14:53:33.547046+00:00","id":72936,"links":{},"metadata":{"_buckets":{"deposit":"df7f9aa0-afc4-4f9b-a715-89511b637d00"},"_deposit":{"created_by":1,"id":"72936","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"72936"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00072936","sets":["10:28"]},"author_link":["718700","718697","718696","718699","718698"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2018-09-04","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Degradation of gamma-ray irradiated polyethylene films were studied by positron annihilation lifetime spectroscopy (PALS) using 22Na positron source. Application of PALS relies on the fact that some of the positrons injected into a polymer combine with an electron to form the hydrogen-like bound state, positronium. In a polymer, spin-parallel ortho-positronium (o-Ps) annihilates by pick-off annihilation in\na free volume with one of the surrounding electrons and the lifetime of o-Ps increases with increasing\nhole size, so we can estimate the free volume size from the lifetime of o-Ps.\nThe obtained results demonstrated that PALS can be useful as an indicator of the structural change induced by irradiation and long-term storage in HDPE. In the presentation, results for gamma-ray were compared with the results for electron-beam polyethylene to discuss the difference of the radiation.","subitem_description_type":"Abstract"}]},"item_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"The 10th International Conference of Modification, Degradation and Stabilization of Polymers (MoDeSt2018)","subitem_description_type":"Other"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"岡, 壽崇"}],"nameIdentifiers":[{"nameIdentifier":"718696","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"長澤, 尚胤"}],"nameIdentifiers":[{"nameIdentifier":"718697","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"木野, 康志"}],"nameIdentifiers":[{"nameIdentifier":"718698","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"関根, 勉"}],"nameIdentifiers":[{"nameIdentifier":"718699","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"長澤 尚胤","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"718700","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"item_title":"DEGRADATION OF GAMMA-RAY IRRADIATED POLYETHYLENE FILMS STUDIED BY POSITRON ANNIHILATION","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"DEGRADATION OF GAMMA-RAY IRRADIATED POLYETHYLENE FILMS STUDIED BY POSITRON ANNIHILATION"}]},"item_type_id":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-09-14"},"publish_date":"2018-09-14","publish_status":"0","recid":"72936","relation_version_is_last":true,"title":["DEGRADATION OF GAMMA-RAY IRRADIATED POLYETHYLENE FILMS STUDIED BY POSITRON ANNIHILATION"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T19:34:29.080058+00:00"}