Skip to main content

Table 2 Concentrations of main elements (Fe, Cu, Ni, Cr, Zn, Na, K, Ca, Mn, Al, Ti, Mg, Co, Sn, Pb, V, and P) from static sampling, air-filter sampling, and swab sampling during sampler-system development up to the launch of the Hayabusa2 spacecraft

From: Environmental assessment in the prelaunch phase of Hayabusa2 for safety declaration of returned samples from the asteroid (162173) Ryugu: background monitoring and risk management during development of the sampler system

Sample code

Profile

Concentration (ng/sample)

Remarks

Fe

Cu

Ni

Cr

Zn

Na

K

Ca

Mn

Al

Ti

Mg

Co

Sn

Pb

V

P

Static sampling

 CPS-01

CC1-Py_Schale

2.4

3.6

1.3

–

92

819

428

455

1.4

3.6

4.3

33

< 0.1

0.4

0.3

< 0.1

19

 

 CPS-02

CC2-Py_Schale

0.3

1.0

0.6

–

36

274

86

441

0.4

5.5

2.4

15

< 0.1

0.1

0.1

< 0.1

6.5

 CPS-03

CC3-Py_Schale

0.9

1.4

1.0

–

39

318

120

118

0.5

4.9

0.6

12

< 0.1

0.1

0.3

< 0.1

4.1

 CPS-04

CC4-Py_Schale

0.5

1.8

0.7

–

66

420

240

325

1.3

3.9

1.8

30

0.2

0.2

0.1

< 0.1

7.6

 CPS-05

CC5-Py_Schale

0.2

0.9

0.3

–

7.7

186

59

39

0.3

4.1

0.2

3.2

< 0.1

< 0.1

< 0.1

< 0.1

1.7

 CPS-06

CC6-Py_Schale

< 0.1

1.3

0.2

–

30

161

30

65

0.4

4.3

0.9

8.1

< 0.1

< 0.1

< 0.1

< 0.1

4.5

 CPS-08

CC8-Py_Schale

< 0.1

0.6

< 0.1

–

6.5

121

19

18

0.1

7.6

0.1

2.2

< 0.1

< 0.1

< 0.1

< 0.1

1.7

 CPS-09

CC9-Py_Schale

0.4

0.9

0.4

–

7.9

115

13

19

0.3

21

0.1

5.7

< 0.1

< 0.1

< 0.1

< 0.1

1.2

 CPS-10

CC10-Py_Schale

0.2

3.8

0.2

–

7.1

138

22

62

0.2

31

0.4

4.3

< 0.1

< 0.1

< 0.1

< 0.1

0.4

 CPS-12

CC12-Py_Schale

2.1

1.1

0.2

–

13

116

9.7

10

0.4

105

0.1

3.7

< 0.1

0.1

0.5

< 0.1

5.4

 CPS-15

CC15-Py_Schale

< 0.1

< 0.1

< 0.1

–

3.4

96

5.3

8.0

0.1

1.2

< 0.1

1.1

< 0.1

< 0.1

< 0.1

< 0.1

< 1.8

Process blank for experimental background

Air filter sampling

 QFT-01

BLANK-#2

0.8

0.8

1.6

6.4

< 4

< 160

45

< 80

0.8

< 0.4

< 0.4

2.4

< 3.2

–

–

< 0.4

5.6

Quartz filter of process blank

 QFT-02

141024-QF-#2

3.9

2.1

3.3

–

37

549

35

375

2.4

23

4.5

29

0.9

< 0.3

< 0.3

< 0.3

< 6

Quartz filter at SFA2

 QFT-03

VAB-12F

2.0

39

3.6

4.0

54

1110

42

174

2.0

1.2

< 0.4

15

3.6

–

–

< 0.4

6.8

Quartz filter at VAB-12F

 QFT-04

STA1-CR

3.2

0.8

4.0

15

29

876

42

776

2.8

4.4

< 0.4

48

16

–

–

< 0.4

5.2

Quartz filter at STAR1-CR

Swab sampling

 GWT-01

141024-00B

0.6

< 0.3

< 0.3

–

2.1

22

3.3

7.8

0.3

12

0.3

0.9

< 0.3

0.3

< 0.3

< 0.3

< 6

Glass wool of process blank

 GWT-02

141024-01A-#2

0.6

4.2

2.7

–

201

2000

251

245

5.4

23

0.9

54

< 0.3

0.9

1.5

< 0.3

< 6

Glass wool at SFA2 payload room

 GWT-03

141024-02A-#2

17

21

3.6

–

5190

1170

489

5310

11

24

11

293

0.6

0.3

8.7

< 0.3

390

Glass wool at SFA2 fairing room elevator

 GWT-04

141024-03A-#2

3.0

6.6

1.5

–

336

507

106

252

2.1

19

0.6

44

< 0.3

0.6

2.7

< 0.3

12

Glass wool at SFA2 fairing room

 GWT-05

141024-04A-#2

16

17

29

–

4380

9600

257

1830

27

33

3.9

1060

3.6

0.3

21

< 0.3

21

Glass wool at VAB-12F floor

 GWT-06

141024-05A-#2

25

21

20

–

2050

9810

345

1730

16

106

4.5

1120

1.2

1.2

22

0.3

12

Glass wool at VAB-12F support rod

FM container

 Swab sampling

FM launch status

< 0.1

< 0.1

< 0.1

–

    

0.2

0.7

0.3

0.8

< 0.1

< 0.1

< 0.1

< 0.1

  
  1. Static concentrations were normalized in units of nanograms per sample (ng/sample) following Takano et al. (2020) using an inductively coupled plasma–mass spectrometry (ICP-MS; 7500 s, Agilent Technologies Inc.). The concentrations of area-based conversions (i.e., ng cm−2) can be obtained by reference to the size scale (Fig. 1)