A note on deadtime:
(I don't think you guys have ever seen this!)

If a particular device, usually a particle detector like a geiger counter,
will not register a new hit, or event, until after a recovery period, 
say Tr, we say that the device has a dead time of Tr. This effects the 
rate at which you can record hits with the device since the device is 
effectively "dead" for a period of Tr seconds after a hit. The true counting
rate, on average, can be calculated from the measured rate:

Rtrue=Rmeasured/(1-Rmeasured*Tr) 

Rmeasured*Tr =  probability counter is off

(1-Rmeasured*Tr) = probability counter is on

In the muon lab, you are asked to look at noise and can run into the
situation where you need to know Rmeasured, but you measured Rtrue! This
can happen if you put the delayed output of the stretched width module in 
coincidence with the output of the discriminator, and you count the hits
from just the discriminator.

R(from stretched) = R(discriminator)/(1+R(discriminator)*width)

Likewise, this is why you can measure a higher coincidence rate if you 
count just the output from the stretched width module for width*rate
close to 1.