Lanthanum Bromide Scintillation Radiation Detectors

Improved Resolution and Efficiency
As shown in Figure 1, LaBr provides better resolution performance over NaI(Tl) systems by approximately a factor of 2. Note that neither the NaI(Tl) detectors nor the lanthanum bromide detectors can approach the resolution of a HPGe detector. The efficiency for LaBr is about 1.3 times that of NaI(Tl) for the same volume and the decay time constant is slightly more than 10% of the NaI detector decay time (see Table 1). On the basis of photoelectron yield, LaBr has higher efficiency and temperature stability than NaI(Tl).

High Count Rate Compatibility
Lanthanum bromide detectors can operate over wide dynamic ranges of count rate with little variation in energy resolution.

Detector Type	Resolution @622 keV (%)	Density (g/cc)	Photoelectron Yield Relative to NaI	Primary Decay Time (usec)
LaBR3(Ce)	2.8 - 4.0	5.29	130	0.026
NaI(Tl)	7	3.7	100	0.230
HPGe	0.2 (1.3 keV)	5.35	N/A	N/A

Figures 2 and 3 show high rate performance of a LaBr detector with an ORTEC digiBASE.


The digiBASE shows minimal resolution degradation over a wide range of count rates.

Dimensions and Weights

Model	Base OD	PMT OD	Detector Housing OD	Detector Housing Length	Overall Length	Net Weight	Shipping Weight
LABR-1x1	57 mm 2.2 in	44.5 mm 1.8 in	30.4 mm 1.2 in	26.1 mm 1.0 in	143 mm 5.6 in +pins	~.06 lb	5 lb
LABR-1.5x1.5	58.7 mm 2.3 in	58.7 mm 2.3 in	43.1 mm 1.7 in	39 mm 1.5 in	151.5 mm 6.0 in +pins	~1 lb	5 lb
LABR-2x2	58.7 mm 2.3 in	58.7 mm 2.3 in	55.8 mm 2.2 in	51.5 mm 2.0 in	164 mm 6.5 in +pins	~1.5 lb	5 lb
LABR-3x3	58.7 mm 2.3 in	58.7 mm 2.3 in	82.5 mm 3.2 in	157 mm 6.2 in	194 mm 7.6 in +pins	~2 lb	5 lb

Spectroscopy Electronics

Electronics	PMT Base/Preamp	Amplifier	MCB	HVPS	Comments
digiBASE or DigiBASE-E	Included	Included	Included	Included	Simplest System - requires computer
digiDart or digiDART-LF with DIM-296	Included	Included	Included	Included	Portable applications with or without computer
NIM Solution with 296 PMT Base	Included	NIM*	MCB**	Included	Requires NIM Bin/Power and computer. Energy and timing can be simultaneous.
NIM Solution with 276 PMT Base	Included	NIM*	MCB**	556	Requires NIM Bin/Power and computer. Energy and timing can be simultaneous.
NIM Solution with 266 PMT Base and 113 Preamplifier	Included	NIM*	MCB**	556	Requires computer. Energy and timing can be simultaneous

*Choice of NIM amplifier: 855, 575A, 570, 590A, 671, 672, 572A
** Choice of MCB: EASY-MCA-2K, EASY-MCA-8K