Fig. 3(Color online) (a) The charge histogram was generated using a KFADC 500 MHz USB module with a 2-inch PMT H7194 and standard 370 kBq
137Cs and
252Cf radioisotope (RI) sources. The mounting of the radioisotope was constructed in such a way that it was attached to the top of a 100 ml container containing Sample A (Ref. LAB) and Sample B (EJ309), as illustrated in
. The supply voltage of the PMT was set at 1750 V, and the data acquisition (DAQ) settings were configured to align with the recommended settings for liquid scintillators. Given that the voltage gain ratio of the DAQ system is 10, the leading edge discrimination trigger threshold (thr) of the DAQ is, in fact, 20 mV. (b) The following plot illustrates the dependence of the detector response on the kernel of detector resolution. The detector response is modelled as a convolution between the charge distribution signal and the kernel of detector resolution, which is assumed to be normally distributed with a standard deviation of
σnormal.
