# Trace radioactive impurities in final construction materials for EXO-200

## TL;DR

This paper presents a comprehensive measurement campaign identifying low-radioactivity materials for the EXO-200 double beta decay experiment, confirming the detector's low background levels and validating the material selection process.

## Contribution

It provides the remaining publicly released data from a systematic campaign to measure radioimpurities in construction materials for EXO-200, using advanced analytical techniques.

## Key findings

- Measurement sensitivities are among the best in the field.
- Construction of EXO-200 was completed with verified low-background materials.
- Phase-I data confirms the effectiveness of material selection.

## Abstract

We report results from a systematic measurement campaign conducted to identify low radioactivity materials for the construction of the EXO-200 double beta decay experiment. Partial results from this campaign have already been reported in a 2008 paper by the EXO collaboration. Here we release the remaining data, collected since 2007, to the public. The data reported were obtained using a variety of analytic techniques. The measurement sensitivities are among the best in the field. Construction of the EXO-200 detector has been concluded, and Phase-I data was taken from 2011 to 2014. The detector's extremely low background implicitly verifies the measurements and the analysis assumptions made during construction and reported in this paper.