Sec. 10.26] GEIGER-MULIER COUNTERS 339 



The statistics of this type of counting-rate meter depend on the fact that 

 the reading at any instant is influenced by all previous pulses weighted expo- 

 nentially according to their elapsed time. The absolute probable error of 

 a single reading is given by [27] 



fey 



If a continuous recording is made, the probable error may be considerably 

 reduced. From a record taken over a time T the mean value of n is deter- 

 mined by drawing a line through the trace which divides the fluctuations 

 into equal areas on both sides. The probable error of the mean is [27] then 



(1 + 2T/RQ* 



r(T) = r 



(1 + T/RC) 



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