A number of years ago I designed a simple radiation detector to check spurious radiation from microwave ovens. My article was then published in Popular Science magazine. I checked the circuit now with a cell phone and with various walkie talkies and it gives a nice reading. The circuit is a 50 microamp meter with a diode across (I used a microwave diode, but it should work with any germanium diode as well). The antenna is a short dipole with arms 2 inches each. I use it for relative readings rather than to get an absolute radiation value.
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