Notation - 1: Observed Quantities

• Convention: Roman letters denote observed quantities

• Nb: number of background counts observed

• Ng: number of gross counts observed

• tb: background count time (s)

• tg: gross count time (s)

• Rb: background count rate (s-1)

• Rg: gross count rate (s-1)

• Rn: net count rate (s-1)

• s(Rn): standard deviation of net count rate (s-1)

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