# Material radioassay and selection for the XENON1T dark matter experiment

## TL;DR

This paper details the comprehensive radioassay of materials used in the XENON1T dark matter detector, ensuring low background noise for WIMP detection through gamma-ray spectroscopy and mass spectrometry.

## Contribution

It presents the first extensive radioassay campaign for XENON1T, guiding material selection and improving sensitivity estimates for dark matter detection.

## Key findings

- Identification of radiopure materials for detector construction
- Quantitative measurements of radioactive impurities in over 100 samples
- Enhanced background modeling for XENON1T sensitivity estimates

## Abstract

The XENON1T dark matter experiment aims to detect Weakly Interacting Massive Particles (WIMPs) through low-energy interactions with xenon atoms. To detect such a rare event necessitates the use of radiopure materials to minimize the number of background events within the expected WIMP signal region. In this paper we report the results of an extensive material radioassay campaign for the XENON1T experiment. Using gamma-ray spectroscopy and mass spectrometry techniques, systematic measurements of trace radioactive impurities in over one hundred samples within a wide range of materials were performed. The measured activities allowed for stringent selection and placement of materials during the detector construction phase and provided the input for XENON1T detection sensitivity estimates through Monte Carlo simulations.