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Low Background Stainless Steel for the Pressure Vessel in the PandaX-II Dark Matter Experiment

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arxiv 1609.07515 v1 pith:PBD5C2ZQ submitted 2016-09-21 physics.ins-det hep-ex

classification physics.ins-dethep-ex
keywords backgroundstainlesssteelpressurevesseldarkexperimentmatter
verification ladder T0 review T1 audit T2 compute T3 formal
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We report on the custom produced low radiation background stainless steel and the welding rod for the PandaX experiment, one of the deep underground experiments to search for dark matter and neutrinoless double beta decay using xenon. The anthropogenic 60 Co concentration in these samples is at the range of 1 mBq/kg or lower. We also discuss the radioactivity of nuclear-grade stainless steel from TISCO which has a similar background rate. The PandaX-II pressure vessel was thus fabricated using the stainless steel from CISRI and TISCO. Based on the analysis of the radioactivity data, we also made discussions on potential candidate for low background metal materials for future pressure vessel development.

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