# Assay of low-background stainless steel by smelting for the neutrino experiment at Jinping

## TL;DR

This study thoroughly investigates the radioactivity of stainless steel produced by smelting to meet ultra-low background requirements for the Jinping Neutrino Experiment, using GDMS and HPGe detectors at various locations.

## Contribution

It provides detailed measurements of radioactivity levels in stainless steel materials specifically prepared for the Jinping Neutrino Experiment, demonstrating their suitability for low-background applications.

## Key findings

- Custom-made stainless steel has radioactivity comparable to other low-background materials.
- Radioactivity levels vary across raw, stage, and commercial samples.
- Results support the use of these materials in the Jinping Neutrino Experiment.

## Abstract

To ensure compliance with the experimental requirement for ultra-low background, in this study the radioactivity of stainless steels manufactured by smelting is thoroughly investigated. Raw materials, stage samples, and commercial samples are investigated by glow discharge mass spectrometry (GDMS) and/or with high-purity germanium detectors (HPGe) at both the ground level and/or the China Jinping Underground Laboratory. Custom-made stainless steel samples are found to have radioactivity levels comparable to those in other low-background experiments. The comprehensive results regarding the radioactivity level in materials to be used in the proposed Jinping Neutrino Experiment are reported.