Fundamental physics rare-event experiments, such as dark matter searches and neutrinoless double beta decay, demand ultra-low background conditions. Radon gas contamination is one of the most challenging backgrounds. While most radon assay programs rely on electrostatic collection methods, these suffer from inherent inefficiencies and limited sensitivity. This project explores novel approaches to achieve unprecedented radon detection sensitivity.

The project will investigate gas time projection chamber (TPC) technology repurposed as an ultra-sensitive radon detector, capable of surpassing current electrostatic methods. It will also test advanced materials for radon enrichment, and extend radon measurements into cold environments and liquid argon, advancing methods for future rare-event searches. By combining these innovations with ANU’s expertise in the DREAMR Radon Facility and CYGNUS-OZ gas TPC program, the project aims to establish a new benchmark for ultra-low background radon detection.

A number of projects are available for students, including:
    •    Detector development – repurposing and optimising TPCs as ultra-sensitive radon detectors
    •    Enrichment techniques – testing advanced materials for radon capture and concentration
    •    Cryogenic studies – developing enrichment and measurement methods at low temperatures
    •    Liquid argon operation – exploring radon behaviour and control in liquid argon systems

Students will gain hands-on training in detector physics and low-background techniques. They will contribute to establishing a new benchmark for radon detection and strengthening national capability to support rare-event searches. This work will support Australia’s contribution to XLZD, the next-generation definitive dark matter experiment. Students will also have opportunities to work with DURRIDGE, the world leader in radon instrumentation, gaining valuable industry experience.

This project suits students motivated by experimental, hands-on hardware research. Experience with experimental projects is an advantage, and students from engineering or chemistry with an interest in gas systems, cryogenics, or instrumentation are also welcome to apply.