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1. INTRODUCTION
The ORTEC digiBASE-E™ is a complete spectroscopy solution for most scintillation detectors.
It includes high voltage, digital signal processing of the detector pulse stream, and high-per-
formance multichannel analyzer functionality all within a standard 14-pin PMT base, and offers
conversion gain settings of 256, 512, 1024, and 2048 channels.
The digiBASE-E can be used with numerous scintillators. NaI(Tl) detectors have been histor-
ically the most popular; but with its new trapezoidal digital filter, the digiBASE-E is also com-
patible with the newer, faster scintillators, such as LaBr3(Ce). The digiBASE-E has almost three
times the throughput of the original digiBASE
®
. With the appropriate scintillator, the estimated
maximum throughput is 196k cps at a 532k cps input rate.
The integral Ethernet RJ45 connector features Power-over-Ethernet (PoE), allowing a simple,
single-cable connection to your LAN or PC.
Flexible gating logic makes it easy to configure multiple digiBASE-Es as part of an integrated
system where synchronized data acquisition is needed. Events can be correlated to <100 milli-
seconds. This makes the digiBASE-E ideal for remote monitoring applications and detector
networks and arrays.
1.1. digiBASE-E Advantages
1.1.1. Gain Stabilization
Because NaI(Tl) detector gain is sensitive to changes in ambient temperature and magnetic
fields, the digiBASE-E incorporates a gain stabilizer to significantly diminish this sensitivity. It
works by monitoring the centroid of a designated peak in the energy spectrum. The fine gain is
automatically and continuously adjusted to maintain the centroid of the peak at its desired
position.
1.1.2. Flexible Acquisition Modes
The digiBASE-E supports both the familiar Pulse Height Analysis (PHA) acquisition mode and
List Mode acquisition. In list mode, each gamma-ray interaction event is recorded in terms of
both energy (as in PHA mode) and time of occurrence (not recorded in PHA mode). The
resulting data set can be sorted on the basis of both time and energy. This has proven invaluable
in many applications such as homeland security, where, for example, a source is moving relative
to a detector. Data without the source present can be discarded on the basis of time of
occurrence, potentially enhancing signal-to-noise.
Summary of Contents for digiBASE-E
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