Earlier this month, we reported on the Scosche RDTX-Pro that connects via a dock connector to turn an iPhone or iPod touch into a radiation detector. That device is set to go on sale in Japan from next month but if you're not in Japan or just don't want to shell out extra cash on any peripheral hardware, then the WikiSensor app might be worth a look - it won't be as accurate, but the only extra bit of kit you'll need is some opaque black tape.
To convert your iPhone into a radiation detector all you need to do is install the WikiSense app and stick some opaque black tape - electrician's tape should do the trick - over the iPhone's front-facing camera. Since the CMOS sensors used in smartphone cameras like the iPhone's don't just pick up visible light but also high frequency waves from radioactive sources, such as gamma and X-rays, covering the lens means only those waves make 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 admit 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 team behind the app plans to develop a tool that uses data gathered from various users to generate a map showing radiation levels in different locations - hence the wiki prefix. With the ultimate vision of developing a platform that uses a network of devices - particularly smartphones - as a sensor network to measure various aspects of environmental quality, the company also has plans to develop apps to measure Wi-Fi waves, relay antenna waves, magnetic fields, earthquakes, greenhouse gases, UVA/UVB light, oxygen and temperature.
The WikiSensor app has only been calibrated for use with the iPhone 4 and is available now for US$0.99 from the iTunes App Store.
Source: Red Ferret
I have used it at the Dentist (!), through customs and when flying. "Great" to see the micro-sievert levels change as you do these things....
It maxed at 3.33mS on my last flight from zurich to London by the way....
and yes it does have calendar functions, with alarm
The watch is cool, but suffers from the same dynamic - no alpha detection - likely limited or no beta particle detection too. Radiation measurement is a very serious business with potentially very serious consequences. I personally rely on the PRM-8000 Geiger counter ($495) from Mazur Instruments. It accurately measures alpha, beta and gamma and detects xrays as well. I fly with it in my brief case and it records in its internal memory measurements every minute (up to 90K minutes) that can be loaded into Excel for later analysis. My 2-cents.