How much random info can a facility generate? Options

[WeaverMount]

Ok so in 2070 there are two instances i can think of off the top of my head where a facility could greatly benifit from the security of a one-time pad cypher where key distribution is relatively trivial. I was thinking of drones and wage-slaves. Both are tracked and in wire contact meaning that encryption would be good. Both also frequently 'dock' at a physical location where more 'pads' could be uploaded with the maximum security that site can.

So my question is, how much truely (or close enough for a one-time-pad) random data could you generate? Could a black box with a radio active isotope and REALLY good sensors generate appreciable amounts of random data? Could it at least generate enough truly random seeds to generate large pads? Is there there a better method altogether?