Crowd-sourced calibration of uncontrolled radiation detectors

Image Insight Inc. recently released an Android application (GammaPix Lite™) that uses smartphone cameras for radiation detection and measurement. Given the wide diversity of smartphones in use, and the frequent release of new models, traceable calibrations of all the devices on which the app could possibly run is clearly not practical. In this paper, we discuss the methods we have developed to address this problem by using data gathered from multiple instances of each device in uncalibrated use. The quality control mechanisms, reference material, and resulting calibrations are discussed in this paper.