  The Optically Segmented Single Volume Scatter Camera (OS-SVSC) aims to image
neutron sources for non-proliferation applications using the kinematic
reconstruction of elastic double-scatter events. Our prototype system consists
of 64 EJ-204 organic plastic scintillator bars, each measuring 5 mm $\times$ 5
mm $\times$ 200 mm and individually wrapped in Teflon tape. The scintillator
array is optically coupled to two silicon photomultiplier ArrayJ-60035 64P-PCB
arrays, each comprised of 64 individual 6 $\times$ 6 mm J-Series sensors
arranged in an 8 $\times$ 8 array. We detail our calibration efforts, beginning
with calibrations for the electronics, based on the IRS3D application-specific
integrated circuits, and their associated timing resolutions, ranging from 30
ps to 90 ps. With electronics calibrations applied, energy and position
calibrations were performed for a set of edge bars using $^{22}$Na and
$^{90}$Sr, respectively, reporting an average resolution of (12.07$\pm$0.03) mm
for energy depositions between 900 keVee and 1000 keVee. We further demonstrate
a position calibration method for the internal bars of the matrix using
cosmic-ray muons as an alternative to emission sources that cannot easily
access these bars, with an average measured resolution of (14.86$\pm$0.29) mm
for depositions between 900 keVee and 1000 keVee. The coincident time
resolution reported between pairs of bars measured up to 400 ps from muon
acquisitions. Energy and position calibration values measured with muons are
consistent with those obtained using particle emission sources.
