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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

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

Fig. 4

a Concentrations of total organics, major elements, and major ions monitored by the monitor coupon (Nos. 1–12, including STA1, SFA2, and VAB). The sample codes were listed in Tables 2 and 3. Each static, quantitative assessment was normalized in units of nanograms per sample (ng/sample). b Quantitative comparison between static monitoring and unit time (days) with regard to total organics and Na concentration

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