Table 2.

Average scatter fraction of typically used photopeak energy windows. Scatter fraction values indicate the relative number of signals within each defined photopeak window that are true scatter events incident on the detector.

Detector tilt	Photopeak energy window width
	$\pm 4\%$ ($\ge 134\mathrm{keV}$)	$\pm 7.5\%$ ($\ge 129\mathrm{keV}$)	$\pm 10\%$ ($\ge 126\mathrm{keV}$)
0 deg	0.09	0.14	0.17
15 deg	0.10	0.15	0.18
30 deg	0.12	0.19	0.22
45 deg	0.15	0.23	0.26