Can a CMOS sensor be used as a Geiger counter To help the folks in Japan protect themselves from contaminated food and to get some assurance of the safety of their homes, we are putting together a team to evaluate the feasibility of writing an iPhone/Android application that would use the CMOS sensor as an ionizing radiation detector. There are several issues that have to be overcome: battery life, the lack of a shutter, attenuation by the camera housing, but by far the biggest issue is the sensitivity due to the thin layer of active silicon in a CMOS camera sensor compared with that in a commerial radiation sensor. Is there anyone in this group that has access to the simulation tools for energy deposition from ionizing radiation and the expertise to use them? If the numbers work out even remotely (overnight integration times maybe?) we are going to write an app and put it up in the App store to help the Japanese get some visibility.