Development of a Compact and Portable High-sensitivity Omnidirectional Compton Camera with Detector Rotation Function

We report the development of a compact and portable high-sensitivity omnidirectional Compton camera. This system can visualise radioactive Cesium even when surface or air dose rates is less than 1 μSv/h. This detector is designed for the Fukushima Daiichi Nuclear Power Plant accident, and low-level radioactive contamination in medical facilities. We adopted the Compton camera technology reported in a previous study (Muraishi et al., Jap. J. Appl. Phys. 2020). This technology enables shift-invariant gamma-ray imaging. The detector can be operated by a PC via Wi-Fi with a power consumption of 15 W. Furthermore, by adopting metal package photomultiplier tubes (PMTs) and optimising the crystal arrangement, we made the detector smaller and improved image quality.