<p>hide captionScientists tested their radiation detection app on four smartphones, concluding that it works well enough to be a useful warning system for first responders. Idaho National Laboratory</p><p>Scientists tested their radiation detection app on four smartphones, concluding that it works well enough to be a useful warning system for first responders. Idaho National Laboratory</p><p>In our Weekly Innovation series, we pick an interesting idea, design or product that you may not have heard of yet. Do you have an innovation to share? Use our form.</p><p>A smartphone camera can make you a walking gamma ray detector. Without needing any extra hardware, you could get a warning on your phone when you're approaching potentially harmful levels of gamma radiation.</p><p><a href="http://www.npr.org/blogs/alltechconsidered/2014/01/23/263369742/weekly-innovation-a-radiation-detector-in-your-smartphone">Keep reading...</a></p>