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

Abstract

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.

References in corpus (3)

• Systematic study of trace radioactive impurities in candidate construction materials for EXO-200
• First dark matter search results from the PandaX-I experiment
• Aluminum as a source of background in low background experiments

Cited by in corpus (8)

• Dark Matter Search Results from the PandaX-4T Commissioning Run
• Low Radioactive Material Screening and Background Control for the PandaX-4T Experiment
• The Cryogenics and Xenon handling system for the PandaX-4T Experiment
• Identification of radiopure tungsten for low background applications
• Neutron-induced nuclear recoil background in the PandaX-4T experiment
• Assay of low-background stainless steel by smelting for the neutrino experiment at Jinping
• Suppression of accidental backgrounds with deep neural networks in the PandaX-II experiment
• Remote Reactor Ranging via Antineutrino Oscillations