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WikiSensor app turns an iPhone into a peripheral-free radiation detector
To modify your iPhone into a radiation detector all you need to do is install the WikiSense app and pin some opaque black tape - electrician's tape should do the quirk - over the iPhone's front-facing camera. Since the CMOS sensors reach-me-down in smartphone cameras like the iPhone's don't just pick up noticeable light but also high frequency waves from radioactive sources, such as gamma and X-rays, covering the lens means only those waves reckon it through to the sensor. Once activated, the application then counts the number of impacts the sensor receives and translates that into a value in microsieverts per hour.
The makers of the app acknowledge it won't give a precise reading, but rather an approximate one that should be validated by more professional tools if a reading above five microsieverts per hour is detected.
The rig behind the app plans to develop a tool that uses data gathered from diverse users to generate a map showing radiation levels in strange locations - hence the wiki prefix. With the ultimate vision of developing a dais that uses a network of devices - particularly smartphones - as a sensor network to calibrate various aspects of environmental quality, the company also has plans to mature apps to measure Wi-Fi waves, relay antenna waves, charismatic fields, earthquakes, greenhouse gases, UVA/UVB light, oxygen and temperature.