DSPEC
®
Digital Gamma-Ray Spectrometer
2
1.1. What is DSPEC?
One germanium or silicon gamma or x-ray detector, one PC, and one DSPEC comprise a
complete spectroscopy system. The detector provides a signal proportional to the gamma-ray
energy; the PC provides the user interface, data display, and storage; and the DSPEC provides
everything else.
DSPEC includes an analog prefilter, fast digitizing circuits, and digital signal processing to
optimize energy resolution and data rate, via variable rate baseline restoration, automatic pulse
pile-up rejection, automatic pole-zero cancellation, ballistic deficit correction and zero effective-
conversion-time peak detection, measurement, and storage. Spectral data is maintained in the
DSPEC battery-backed data memory until transferred to the PC by the user. DSPEC also
includes the high-speed data link to the PC, with a choice of ORTEC’s ultra-fast, direct Dual-
Port Memory interface or standard Ethernet interface. You can even connect multiple DSPEC
units into networks and control them all from anywhere on the network!
1.2. About this Manual
This manual describes the ORTEC DSPEC Digital Gamma-Ray Spectrometer, and provides all
the information necessary to prepare the DSPEC for use and connect it into a complete
spectroscopy system. Because the DSPEC is almost completely computer controlled, this manual
is short. Details on running the control software are contained in the MAESTRO
™
and
GammaVision
™
software manuals. A condensed version of some key MAESTRO and
GammaVision information is provided in the ORTEC publication entitled “
DSPEC Digital
Gamma-Ray Spectrometer and Its Use with MAESTRO
™
or GammaVision
™
.”
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