SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001148

Beamline

BL47XU (Micro-CT)

Scientific keywords

A. Sample category	inorganic material
B. Sample category (detail)	solid-state crystal, amorphous, glass, crystal, mineral,rock
C. Technique	absorption and its secondary process
D. Technique (detail)
E. Particular condition	3D imaging (cf. CT)
F. Photon energy	X-ray (4-40 keV)
G. Target information	morphology

Industrial keywords

level 1---Application area	construction, others
level 2---Target	Concrete
level 3---Target (detail)
level 4---Obtainable information	density, crack, crevice, structure, molphology
level 5---Technique	imaging

Classification

A80.90 others, M60.20 X-ray CT

Body text

Extraterrestrial materials of 1 mm in size are called as cosmic dust in contrast to meteorites (1 mm). They are classified into cosmic spherules, micrometeorites (MMs) and interplanetary dust particles (IDPs). MMs are irregular shaped particles of a few 10s to a few 100s um in size and collected from snow and ice in the polar region.
Density is one of the most important parameter, however, it is difficult to measure precisely such as small materials. Therefore an ultra micro-balance and micro-tomography were used to measure their weight and volume (Figure upper left: CT image, upper right: solid region (white) and internal voids region (magenta)).
The bulk density including the volume of internal voids and solid density not including the volume of internal voids were obtained (bottom figures). The solid density of heated sample is different from non-heated sample during entry to the atmosphere.
This method will be applied to the sample of HAYABUSA mission. HAYABUSA's mission: to bring back samples from an asteroid and investigate the mysteries of the birth of the solar system.

[ Meteoritics and Planetary Science 39, A107 (2004),
©2004 Meteoritical Society ]

Source of the figure

Original paper/Journal article

Journal title

A. Tsuchiyama, T. Okazawa, T. Noguchi, H. Yano, T. Osawa, T. Nakamura, K. Nakamura, T. Nakano, K. Uesugi, and H. Yasuda (2004) Meteor. Plant. Sci., 39, Suppl. A107.

Figure No.

Technique

Source of the figure

No figure

Required time for experimental setup

1 shift(s)

Instruments

Instrument	Purpose	Performance
X-ray CT system	obtain internal structure of materials	spatial resolutin of about 1µm

References

Document name
A. Tsuchiyama, T. Okazawa, T. Noguchi, H. Yano, T. Osawa, T. Nakamura, K. Nakamura, T. Nakano, K. Uesugi, and H. Yasuda (2004) Meteor. Plant. Sci., 39, Suppl. A107.

Related experimental techniques

Questionnaire

The measurement was possible only in SPring-8. Impossible or very difficult in other facilities.
This solution is an application of a main instrument of the beamline.

Ease of measurement

Middle

Ease of analysis

Middle

How many shifts were needed for taking whole data in the figure?

Four-nine shifts