The RadDetect I alluded to claims to have a directional feature. You can determine what direction the radioactivity is coming from and move away from it. It would also be good to have if someone decided to lace the subway platform with a highly radioactive substance without using explosives at all. I guess you could also use it to determine if you had successfully washed all the radioactive dust off of yourself. Or how radioactive your apartment is after the dust settles.
Well radiation particals are moved by the wind. Which really means, you just have to make sure your not down wind of an explosion (or any chemical accident/incident). Besides if the source is made up particals, they might have catch up with you and surround you.
An non-explosive "dirty bomb", so called smokey bombs are generally made of diffrent, weaker radiation emmiters (alpha, beta), which are either not detected or very hard to detect with these small detectors.
and "lacing" radiation emmiters, is a very very inefficient way to distribute it and doesn't creat as much fear.
checking you home and your self is much more efficient, when you use a proper geigercounter.
The only use i can think of these devicese are for explosive scouts and EOD, as a back-up warning...
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