Effect of Photomultiplier Tube Voltage on the Performance of Sealed NaI (Tl) Scintillator Detectors

Table 1

Material parameters for model simulation.

Material	Density/(g/cm^3)	Size/(diameter × height, inch)
NaI (Tl)	3.67	2 × 2 (group 2)
NaI (Tl)	3.67	1 × 1 (group 1)
MgO	3.58
Al	2.7
Optical glass	2.3
Sponge	0.045
Pb shielding layer	11.34
Silicone oil	0.96