Table 2.

(a) Summary of LEHR and PH20 simulation parameters. All measurements given in centimeters. (b) Geometric efficiency and spatial resolution for LEHR and PH20 are calculated at distances of 19.5cm and 25.0cm from the center of the detector for point sources.

	Diameter	Length	Configuration	D-Ca Distance
LEHR	0.119	1.88	Hexagonal	0.75
PH20	0.75	0.8	Square (6.2 short, 5.81 long)	12.2
(a)

Collimator	EFFb 19.5cm	EFF 25.0cm	SRc19.5cm	SR 25.0 cm
LEHR	1.3 × 10−4	1.3 ×10− 4	1.39cm	1.75cm
PH20	1.6 × 10− 3	9.5 × 10− 4	4.01cm	5.4cm
(b)

^adetector-collimator distance

^befficiency

^cspatial resolution