Rare event searches such as neutrinoless double beta decay and Weakly
Interacting Massive Particle detection require ultra-low background detectors.
Radon contamination is a significant challenge for these experiments, which
employ highly sensitive radon assay techniques to identify and select
low-emission materials. This work presents the development of ultra-sensitive
electrostatic chamber (ESC) instruments designed to measure radon emanation in
a recirculating gas loop, for future lower background experiments. Unlike
traditional methods that separate emanation and detection steps, this system
allows continuous radon transport and detection. This is made possible with a
custom-built recirculation pump. A Python-based analysis framework, PyDAn, was
developed to process and fit time-dependent radon decay data. Radon emanation
rates are given for various materials measured with this instrument. A radon
source of known activity provides an absolute calibration, enabling
statistically-limited minimal detectable activities of 20 $\mu$Bq. These
devices are powerful tools for screening materials in the development of
low-background particle physics experiments.

Questo articolo esplora i giri e le loro implicazioni.

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