# Krypton and radon background in the PandaX-I dark matter experiment

## TL;DR

This paper evaluates the background contributions of krypton-85 and radon isotopes in the PandaX-I liquid xenon dark matter detector, combining measurements and simulations to understand their impact on background noise.

## Contribution

It provides the first in-situ evaluation of krypton and radon backgrounds in PandaX-I, integrating experimental data with simulations for accurate background modeling.

## Key findings

- Quantified krypton-85 and radon contributions to background
- Improved understanding of background sources in liquid xenon detectors
- Enhanced background mitigation strategies for dark matter searches

## Abstract

We discuss an in-situ evaluation of the $^{85}$Kr, $^{222}$Rn, and $^{220}$Rn background in PandaX-I, a 120-kg liquid xenon dark matter direct detection experiment. Combining with a simulation, their contributions to the low energy electron-recoil background in the dark matter search region are obtained.