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
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
复制标题
DOI：
10.1186/s40623-022-01628-z
复制
发表时间：
2022-06-10
影响因子：
3
通讯作者：
Tachibana, Shogo
中科院分区：
文献类型：
--
作者：
Sakamoto, Kanako;Takano, Yoshinori;Tachibana, Shogo
我们报告了在采样器系统开发期间直至隼鸟二号航天器发射期间进行的地面环境评估。我们对潜在污染物进行了静态监测，以评估以下过程中的环境清洁度：(1) 在采样器设备的开发和制造过程中进行的实验室工作，(2) 在航天器上安装采样器系统，以及 (3) 运送到日本宇宙航空研究开发机构 (JAXA) 种子岛航天中心的发射场。我们的无机分析中检测到的主要元素和离子是钠 (Na)、钾 (K) 和离子氯化物 (Cl-)；这些元素和离子与总有机物含量以及暴露持续时间呈正相关，每个监测取样片在 10(1) 至 10(3) 纳克范围内，直径范围类似于 30 毫米。我们确认，在预启动阶段的制造、安装和运输过程中，优惠券上的总沉积量低于微克级订单。目前的评估得出了一个名义上的安全声明，用于分析从小行星 (162173) Ryugu 返回的原始样本 (>5.4 g)，并结合高度清洁的环境背景水平。我们预计隼鸟二号从龙宫返回的样本不会受到严重和/或未知的污染，并使我们能够提供碳质小行星历史记录的原始剖面。
We report ground-based environmental assessments performed during development of the sampler system until the launch of the Hayabusa2 spacecraft. We conducted static monitoring of potential contaminants to assess the environmental cleanliness during (1) laboratory work performed throughout the development and manufacturing processes of the sampler devices, (2) installation of the sampler system on the spacecraft, and (3) transportation to the launch site at the Japan Aerospace Exploration Agency's (JAXA's) Tanegashima Space Center. Major elements and ions detected in our inorganic analyses were sodium (Na), potassium (K), and ionized chloride (Cl-); those elements and ions were positively correlated with the total organic content and with exposure duration in the range from 10(1) to 10(3) nanograms per monitor coupon within an similar to 30-mm diameter scale. We confirmed that total deposits on the coupon were below the microgram-scale order during manufacturing, installation, and transportation in the prelaunch phase. The present assessment yields a nominal safety declaration for analysis of the pristine sample (>5.4 g) returned from asteroid (162173) Ryugu combined with a highly clean environmental background level. We expect that the sample returned from Ryugu by Hayabusa2 will be free of severe and/or unknown contamination and will allow us to provide native profiles recorded for the carbonaceous asteroid history.