Table 1.

The energy bandwidth of selected $\sim$ 500 keV proton beam measured for each energy selector configuration of entrance slit and exit pinhole.

Entrance slit	Exit pinhole/slit	Central energy (keV)	Bandwidth (keV)
50 $\mathrm{\mu }$m slit	200 $\mathrm{\mu }$m slit	501 ± 8	79 ± 8
50 $\mathrm{\mu }$m slit	20 $\mathrm{\mu }$m pinhole	510 ± 4	54 ± 4
20 $\mathrm{\mu }$m slit	20 $\mathrm{\mu }$m pinhole	498 ± 4	44 ± 4
20 $\mathrm{\mu }$m slit	10 $\mathrm{\mu }$m pinhole	497 ± 4	33 ± 4