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. Author manuscript; available in PMC: 2013 Nov 21.
Published in final edited form as: Nucl Instrum Methods Phys Res A. 2012 Nov 21;693:236–243. doi: 10.1016/j.nima.2012.07.029

Fig. 5.

Fig. 5

Left: Total number of counts at each source location collected for 15 minutes at each point, with 0.1 mm step size. Right: Geometric beam spread for DOI measurements, which shows the count differences between neighboring points with 0.1 mm apart in the plot. The solid line is a Gaussian fit to these data, and has a FWHM of 1.2 mm.