If a detecting system recordsNcounts inTseconds, with each recorded count followed by a dead time tgr;, the statistical variation inNis plusmn;N1/2/(1+Rtgr;) (not just plusmn;N1/2), whereRis the true rate of occurrence of events. The value ofRinferred from this experiment is subject to a statistical error of Dgr;R/R=plusmn;N1/2. This equation is accurate as long asN1/2/Rtgr;Gt;1.
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