{"created":"2023-05-15T15:01:21.730762+00:00","id":83244,"links":{},"metadata":{"_buckets":{"deposit":"bdbc53be-928f-4bd4-a4a0-fd7bfe78f271"},"_deposit":{"created_by":1,"id":"83244","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"83244"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00083244","sets":["10:28"]},"author_link":["998084","998085","998080","998077","998086","998079","998078","998081","998082","998087","998083"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2021-08-26","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Local density of hydrogen radicals (•H) generated in water during X-ray irradiation to aqueous reaction mixtures were quantified by an electron paramagnetic resonance (EPR) spin-trapping technique using 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a spin-trapping agent. During water radiolysis process (Eq. 1‒4), the •H could be generated by reaction of hydrated electron (e-aq) and hydrogen ions (H+), which were generated simultaneously with hydroxyl radical (•OH) from ionized water (H2O+).\nX-ray  ~~>  H2O  →  H2O+  +  e-[1]\ne-  +  nH2O  →  e-aq[2]\nH2O+  →  •OH  +  H+[3]\nH+  +  e-aq →  •H[4]\nTherefore, similar amount of •OH and •H should be expected, however, the G-values reported for •OH and •H are 0.28 and 0.06, respectively. To clarify what could make this difference of yields of •OH and •H, total amount and local densities of X-ray induced •OH and •H were compared.\nA concentration series of DMPO aqueous solutions (0.49 mM〜1700 mM) was prepared. The sample solutions were irradiated with 32 Gy of X-ray. Signal intensities of DMPO-OH and DMPO-H caused in the sample were measured by X-band EPR spectrometer. The decay of DMPO-OH and DMPO-H during irradiation was corrected and the net yield was observed [1]. The profiles observed by plotting concentrations of DMPO-OH and DMPO-H against the DMPO density (reciprocal of the intermolecular distance of DMPO) were analysed.\nWhen X-ray was irradiated to DMPO aqueous solutions under an aerobic condition, the profile of DMPO-OH generation showed 3-phase as reported previously [2], however; the profile of DMPO-H showed 2-phase. Both profiles observed for DMPO-OH and DMPO-H were almost overlapped except the DMPO-H lacked 3rd phase. Irradiation under hypoxic condition also showed similar results. The inflection point made by 1st and 2nd phases indicates relatively sparse (mmol/L-level) generation of the target radical. The yields of sparse generations of both •OH and •H were estimated as 200 mmol/L/Gy. Total yields of •OH and •H, which could be expected from end the plots, were 500 mmol/L/Gy or more for •OH and 200 mmol/L/Gy for •H. •H generation is available only from sparse ionization.\nReferences:\n[1] Matsumoto K, Ueno M, Shoji Y, Nakanishi I, Radiat. Biol. Res.Commun. 55, 303‒321 (2020).\n[2] Matsumoto K, Ueno M, Nakanishi I, Anzai K, Chem. Pharm. Bull.. 63, 195‒199 (2015).","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":"ISMAR-APNMR-NMRSJ-SEST 2021 (a joint meeting of the 22nd International Society of Magnetic Resonance Conference, the 9th Asia-Pacific NMR Symposium, the 60th Annual Meeting of the Nuclear Magnetic Resonance Society of Japan (2021), and the 60th Annual Meeting of the Society of Electron Spin Science and Technology)","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":"Yusuke, Makino"}],"nameIdentifiers":[{"nameIdentifier":"998077","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Megumi, Ueno"}],"nameIdentifiers":[{"nameIdentifier":"998078","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yoshimi, Shoji"}],"nameIdentifiers":[{"nameIdentifier":"998079","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ken-ichiro, Matsumoto"}],"nameIdentifiers":[{"nameIdentifier":"998080","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ikuo, Nakanishi"}],"nameIdentifiers":[{"nameIdentifier":"998081","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Fukui, Koji"}],"nameIdentifiers":[{"nameIdentifier":"998082","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yusuke, Makino","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"998083","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Megumi, Ueno","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"998084","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Yoshimi, Shoji","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"998085","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kenichiro, Matsumoto","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"998086","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ikuo, Nakanishi","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"998087","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":"Generation of Hydrogen Radical in Water Irradiated by X-ray","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Generation of Hydrogen Radical in Water Irradiated by X-ray"}]},"item_type_id":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2021-05-14"},"publish_date":"2021-05-14","publish_status":"0","recid":"83244","relation_version_is_last":true,"title":["Generation of Hydrogen Radical in Water Irradiated by X-ray"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T19:50:06.202994+00:00"}