[N3-tech] Counting particle noise

hi all,

There is attached a document where we see that the particle noise power is inversely proportional to the receiver radius.

In the previous mail, Max you commented that meausured fluctuations can be cut down taking as a measure the average value within a time interval smaller than the correlation time, and you said this correlation time is equal to the radius of the receiver squared and divided by the diffusion coefficient, could you explain something else about how you find this value?

Regards