OSIRIS-REx will return pristine samples of carbonaceous asteroid Bennu. This article describes how pristine was defined based on expectations of Bennu and on a realistic understanding of what is achievable with a constrained schedule and budget, and how that definition flowed to requirements and implementation. To return a pristine sample, the OSIRIS-REx spacecraft sampling hardware was maintained at level 100 A/2 and <180 ng/cm2 of amino acids and hydrazine on the sampler head through precision cleaning, control of materials, and vigilance. Contamination is further characterized via witness material exposed to the spacecraft assembly and testing environment as well as in space. This characterization provided knowledge of the expected background and will be used in conjunction with archived spacecraft components for comparison with the samples when they are delivered to Earth for analysis. Most of all, the cleanliness of the OSIRIS-REx spacecraft was achieved through communication among scientists, engineers, managers, and technicians.

中文翻译：

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OSIRIS-REx 污染控制策略和实施


OSIRIS-REx 将返回碳质小行星贝努的原始样本。本文描述了如何根据 Bennu 的期望以及对在有限的时间表和预算下可以实现的目标的现实理解来定义原始，以及该定义如何流向需求和实施。为了返回原始样本，OSIRIS-REx 航天器采样硬件通过精确清洁、材料控制和警惕，将采样器头上的氨基酸和肼保持在 100 A/2 水平和 <180 ng/cm2。通过暴露于航天器组装和测试环境以及太空中的见证材料进一步表征污染。这种表征提供了预期背景的知识，并将与存档的航天器组件结合使用，以便在将样本运送到地球进行分析时与样本进行比较。最重要的是，OSIRIS-REx 航天器的清洁度是通过科学家、工程师、管理人员和技术人员之间的沟通实现的。