Noble-gas mass-spectrometer of high performance

高性能稀有气体质谱仪

• 批准号: 06554023
• 负责人: TAKAOKA Nobuo
• 金额: $ 5.38万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06554023/
• 关键词: mass spectrometer; noble gas; meteorite; 3次収差; Qレンズ; 高感度・高分解能質量分析計; ビームプロファイル

Since noble gases are chemically inert and similar in their chemical properties, we may grasp them as a chemical element with 23 isotopes, in cosmo-and geo-chemistry. In addition, there are noble gas isotopes produced from radioactive parent nuclides of different lifetime. These enable us to apply noble gases to problems concerning the evolution of the earth and planetary system. To know isotope signatures and trapping sites of meteoritic noble gases simultaneously, we analyze meteorite samples with a laser-micro-probe. For measuring noble gases of 10^4 atoms or less, evolved with the laser-micro-probe, we made a mass spectrometer of QQQH field configuration. The spectrometer has low magnification and three-dimensional focusing. We investgated sensitivity, mass resolution and background (vacuum) of the spectrometer. We obtained a good sensitivity but there remain some problems to be solved in mass resolution and background spectrum.

由于稀有气体是化学惰性的，化学性质相似，我们可以在宇宙化学和地球化学中将其视为具有23种同位素的化学元素。此外，还有由不同寿命的放射性母核产生的惰性气体同位素。这些使我们能够将惰性气体应用于有关地球和行星系统演化的问题。为了同时了解陨石惰性气体的同位素特征和捕获位置，我们用激光微探针对陨石样品进行了分析。为了测量10^4个原子以下的惰性气体，我们用激光微探针研制了一台QQQH场型质谱计。光谱仪具有低放大倍率和三维聚焦。考察了谱仪的灵敏度、质量分辨率和本底（真空度）。我们获得了很好的灵敏度，但在质量分辨率和背景光谱方面还存在一些问题需要解决。

项目成果

N.Takaoka: "Half-life of ^<130>Te double-beta decay measured with geologically qualified samples." Phys.Rev.C,. 53(印刷中). (1996)

N.Takaoka：“用地质合格样品测量的 ^<130>Te 双 β 衰变的半衰期。”Phys.Rev.C，（1996 年）。

N.Takaoka: "Enrichment and fractionation of noble gases in bubbles." Noble Gas Geochem.Cosmochem.(Ed.by J.Matsuda, Terra Sci.Pub.Co., Tokyo). 23-29 (1994)

N.Takaoka：“气泡中稀有气体的富集和分馏。”

M.Sekiya: "Condition for the formation of the compound chondrules in the solar nebula." Proc.NIPR Symp.Antarct.Meteorites,. 9(印刷中). (1996)

M.Sekiya：“太阳星云中复合球粒的形成条件。”Proc.NIPR Symp.Antarct.Meteorites，（1996 年）。

N.Takaoka: "Half-life of ^<130>Te double-beta decay measured with geologically qualified samples." Phys.Rev.C. 53(印刷中). (1996)

N.Takaoka：“用地质合格样品测量的 ^<130>Te 双 β 衰变半衰期。”Phys.Rev.C.（出版中）。

N.Takaoka: "Noble gases in tellurium and associated minerals and double-beta decay of ^<130>Te." J.Mass Spectrom.Soc.Jpn.,. 44. 63-77 (1996)

N.Takaoka：“碲和相关矿物中的稀有气体以及 ^<130>Te 的双 β 衰变。”