Mr. Thomas Fehrenbach Profile

Thomas Fehrenbach

at Karlsruher Institut für Technologie

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Proceedings Article | 10 February 2012 Paper

Measuring ionizing radiation with a mobile device

Matthias Michelsburg, Thomas Fehrenbach, Fernando Puente León

Proceedings Volume 8304, 83040A (2012) https://doi.org/10.1117/12.908757

KEYWORDS: Ionizing radiation, Electrons, Sensors, Cameras, Mobile devices, Photons, Image segmentation, Cell phones, X-ray sources, Image analysis

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In cases of nuclear disasters it is desirable to know one's personal exposure to radioactivity and the related health risk. Usually, Geiger-Mueller tubes are used to assess the situation. Equipping everyone with such a device in a short period of time is very expensive. We propose a method to detect ionizing radiation using the integrated camera of a mobile consumer device, e.g., a cell phone. In emergency cases, millions of existing mobile devices could then be used to monitor the exposure of its owners. In combination with internet access and GPS, measured data can be collected by a central server to get an overview of the situation. During a measurement, the CMOS sensor of a mobile device is shielded from surrounding light by an attachment in front of the lens or an internal shutter. The high-energy radiation produces free electrons on the sensor chip resulting in an image signal. By image analysis by means of the mobile device, signal components due to incident ionizing radiation are separated from the sensor noise. With radioactive sources present significant increases in detected pixels can be seen. Furthermore, the cell phone application can make a preliminary estimate on the collected dose of an individual and the associated health risks.

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