Count Window Rate Three-Row Scan - Nuclear Radiation: Decay, Binding, and Shielding Step by Step

A rate is a count window divided by its time window. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Twelve counts over three seconds

Count window 12 over 3 seconds gives rate 4 per second.

R=12\div3=4\ /\mathrm{s}

Twenty-four counts over six seconds

Count window 24 over 6 seconds gives rate 4 per second.

R=24\div6=4\ /\mathrm{s}

Thirty-six counts over nine seconds

Count window 36 over 9 seconds gives rate 4 per second.

R=36\div9=4\ /\mathrm{s}