You may be extremely lucky, but these detectors come from everywhere, even could be from exactly some nuclear facility like Chernobyl, so contaminated with radi

You may be extremely lucky, but these detectors come from everywhere, even could be from exactly some nuclear facility like Chernobyl, so contaminated with radioactive dust. But, for Russian electronics exists good rule - handle in gloves and wipe with alcohol before use (sure than properly utilize used swabs). So you will clear all dust from surface, and if you will not used to suck or crunch radio components you are in safety as from my own experience these detectors are really durable.