Unless you have a personal space to hang out in for a very extended period - a radiation shelter stocked with lots of food, water and other supplies - what is the use of a radiation detector? The knowledge to stay inside, stay shielded as best you can, etc. would be your guiding principles. Would a detector materially alter what you do?
A detector might tell you just how bad it is out there, but since there's nothing you can do about it, who cares? I would think a good reference book on how radiation spreads, how to protect yourself from it, etc. would be the better resource to have. Knowledge.
Radiation tends to fade quite quickly. You don't need a "very extended period". Most should be gone in a fortnight, and even 3 days will make a big difference. It's exponential.
I would hope that a survival detector would help one decide when it is safe to leave your shelter. Your probably safe to wait two weeks, but if you run out of food and means to dispose of waste after one, then being able to leave earlier could be invaluable. The alternative is to wait until the authorities give the all-clear, and who knows what criteria they are using?
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