A study of three-dimensional structures of interplanetary dust by imaging x-ray microtomography.

通过 X 射线显微断层成像技术研究行星际尘埃的三维结构。

• 批准号: 15340186
• 负责人: TSUCHIYAMA Akira
• 金额: $ 10.24万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340186/
• 关键词: interplanetary dust particles; micrometeorites; Stardust; cometary dust; SPring-8; microtomography; subtraction method; fractal dimension; 超炭素質微隕石; マイクロトモグラフィー; フラクタル; 宇宙塵; スフェリュール; スプリング8; 宇宙度; X線マイクロトモグラフィー; コンドリュール; 3次元構造; 密度; 空隙率

Three-dimensional structures of cosmic dust (interplanetary dust particles and unmelted micrometeorites) and cometary dust that was collected by NASA Stardust mission were examined using x-ray microtomography at SPring-8. Three-dimensional structures with ultra-high spatial resolution of less than 100 nm has been obtained at the end of the term of this project by imaging tomography using attenuation contrast by overcoming troubles in an optical system for enlargement of x-ray beams and a sample rotation stage. We have also examined some samples by projection CT with the spatial resolution of about 0.5 μm. Physical properties of the samples, such as porosities and densities, were obtained from the three -dimensional structures of the cosmic dust samples. Furthermore, fractal dimensions of the samples were successfully obtained. The fractal dimensions of cosmic dust which was considered to be derived from comets are significantly less than 3. This may suggest evidence of aggregation of c … More onstituent particles of the dust in the early stage of the solar system. The Stardust sample analysis, which was performed as one of the members of preliminary examination team of Stardust, revealed the three-dimensional structures of impact tracks in aerogel collectors and terminal particles in the tracks. These results gave information about the impact processes as well as basic textural information for further detailed destructive analyses. Experimental studies of infrared spectrum of cosmic dust minerals in connection with infrared astronomical observation have been also made for comprehensive research on cosmic dust. Furthermore, development of the tomography system at SPring-8 and evaluation of its performance have been done. Brightness of CT images was quantitatively formulated. By using this formulation, we have established a technique for three-dimensional element mapping of Fe and Cs using the subtraction method. The results were applied to meteorites and other terrestrial samples as well as cosmic dust samples. Less

在SPring-8上利用X射线显微断层摄影术对美国航天局星尘使命收集的宇宙尘埃（行星际尘埃颗粒和未熔化的微陨石）和彗星尘埃的三维结构进行了检查。在本项目期末，通过克服用于放大X射线束的光学系统和样品旋转台的问题，利用衰减对比度成像断层摄影术，获得了具有小于100 nm的超高空间分辨率的三维结构。我们还用投影CT对一些样品进行了检查，其空间分辨率约为0.5 μm。从宇宙尘埃样品的三维结构中获得了样品的物理性质，如孔隙率和密度。此外，成功地获得了样品的分形维数。被认为是彗星形成的宇宙尘埃的分维明显小于3。这可能表明c ...更多信息 太阳系早期的尘埃粒子。作为星尘号初步检查小组成员之一进行的星尘号样品分析揭示了气凝胶收集器中撞击轨迹和轨迹中终端粒子的三维结构。这些结果提供了有关撞击过程的信息以及进一步详细破坏性分析的基本结构信息。为了对宇宙尘进行综合研究，还结合红外天文观测对宇宙尘矿物的红外光谱进行了实验研究。此外，在SPring-8的层析成像系统的发展和评价其性能已经完成。对CT图像的亮度进行了定量描述。利用这个公式，我们已经建立了一个技术的三维元素映射的Fe和Cs使用减法。这些结果被应用于陨石和其他陆地样本以及宇宙尘埃样本。少

项目成果

Three-dimensional structures of interplanetary dust particles and IDP-like large micrometeorites using synchrotron radiation microtomography.

使用同步辐射显微断层扫描技术拍摄行星际尘埃颗粒和类似 IDP 的大型微陨石的三维结构。

• 发表时间: 2006
• 期刊: Lunar Planet.Sci., XXVII
• 作者: C.Koike;H.Sogawa;H.Yasuda;H.Yasuda;A.Tsuchiyama
• 通讯作者: A.Tsuchiyama

T.Nakamura, T.Noguchi, M.E.Zdensky, M.Tanaka: "Noble-gas signatures and Mineralogy of the carbonate-rich lithology of the Tagish Lake carbonaceous chondrite"Earth and Planetary Science Letters. 207. 83-101 (2003)

T.Nakamura、T.Noguchi、M.E.Zdensky、M.Tanaka：“塔吉什湖碳质球粒陨石富含碳酸盐岩性的稀有气体特征和矿物学”地球与行星科学快报。

Nondestructive three-dimensional element-concentration mapping of a Cs-doped partially molten granite by X-ray computed tomography using synchrotron radiation.

使用同步加速器辐射通过 X 射线计算机断层扫描对掺铯部分熔融花岗岩进行无损三维元素浓度测绘。

• 发表时间: 2004
• 期刊: American Mineralogist 89
• 作者: S.Ikeda;T.Nakano;A.Tsuchiyama;K.Uesugi;Y.Suzuki;K.Nakamura;Y.Nakashima;H.;Yoshida
• 通讯作者: Yoshida

Far infrared spectra of plagioclase feldspar

斜长石的远红外光谱

• 发表时间: 2004
• 期刊: Pro."The Dusty and Molecular Universe" ESPA SP-577
• 作者: C.Koike;K.Koike;H.Sogawa;H.Sogawa;Yuki Kimura;Yuki Kimura;Mami Kurumada;T.Naoi;M.Matsuura;C.Koike;C.Koike;H.Chihara
• 通讯作者: H.Chihara

Evolution of regular monotectic structure during unidirectional solidification under a static magnetic field.

静磁场下单向凝固过程中规则偏晶结构的演化。

• 发表时间: 2005
• 期刊: Trans.Indian Inst.Metals 58
• 作者: C.Koike;H.Sogawa;H.Yasuda;H.Yasuda;A.Tsuchiyama;G.J.Flynn;A.Tsuchiyama;A.Tsuchiyama;H.Yasuda;H.Yasuda;A.Tsuchiyama;H.Yasuda;H.Yasuda
• 通讯作者: H.Yasuda