DSPEC 50/50A and DSPEC 502/502A Digital Gamma Spectrometers

Performance built on experience

The DSPEC 50 and DSPEC 502 were developed to celebrate ORTEC's 50th anniversary, which has provided innovative and high-quality nuclear instruments to scientists in a range of application fields. Fifteen years after the first ORTEC DSPEC® digital spectrometer gained popularity among spectrometers for its performance and stability, the new DSPEC 50 and DSPEC 502 mark a milestone that brings together our extensive design experience in the field of digital spectrometers and the continuous innovation capabilities of our developers.

In addition to the standard models, the DSPEC 50 and DSPEC 502 are also available in newer premium versions. Both versions feature the same digital signal processing technology and stability, delivering unparalleled energy spectrum performance. The advanced version also includes optimized time characteristics consistent applications, such as anti-Compton spectrometer systems, anti-cosmic ray systems, etc. Web service interface that can run and extend applications independently of the operating system.

Advanced version performance (DSPEC 50A and DSPEC 502A)

• ADCConversion gain up to64K, can meet more wide energy range applications!
  
  
• Digital time coincidence function for anti-Compton spectrometer systems and anti-cosmic ray systems. performance provided!
  
  
  
  • Definable output port options
    • Sample change: command output available for automatic sample changer
    • CRM: Output for fast detection channel
    • SCA: Output user settingsPeak count within ROI
    • ADC Gate:Gate signal output
  • Definable compliance options and gate signal options
    • Gate: Same options as standard model (off, conforming and anti-conforming)
    • Coherence delay and window: optimize the coherence signal, improveCoherence between ADC channels and gate signals
    • Gate signal delay and window: set the start and duration of the time
    • Gate signal mode: obtain coincidence and anti-coincidence data at the same time. All spectral data passN42 format file storage and recall
  • The functionality eliminates the complexity of setting up the original time compliance system. Simply place the coincidence detector (plug detector/ ring detector or plastic scintillator detector in anti-cosmic ray system) output is connected to the gate signal input. Set the output to CRM to optimize the coincidence and gate signal times of the HPGe detector. It's that simple! The matched spectrum, matched spectrum and full score will all be stored in the same XML ANSI N42 format spectrum file!
• Operating system independent web pages andWeb service interface
  Web pages run directly on the deviceIn the web service, you can access internal web pages through a web browser without installing any software, and perform hardware settings, operation, acquisition control, data storage, etc. Just enter the set address in the browser. Works on most browsers including Windows, Linux, Android and Apple systems.
  
  Comes with the deviceWeb services provide the best development interface. Can support application development under any operating system and any development environment. There is no need to install any drivers or development packages. The demo program on the ORTEC website can help you quickly start your development project.

Common features between Standard and Advanced versions

• single path(DSPEC 50/50A)and double road (DSPEC 502/50A)
• Excellent stability under rapidly changing count rates and temperatures
• Automation Settings: Auto Zero, Baseline Recovery, and Automation
• digital spectrum stabilizer
• USB 2.0and Ethernet (TCP/IP)Connection method
• Ultra-high count pass rates in high count rate applications
• Extra large front display screen provides clear system status information at a glance
• Support allHPGe detector types, both old and new
• 16k ADCconversion gain
• "No loss" or "zero dead time" (ZDT)
  A common method used to calculate count loss at high rates is to extend the acquisition time. The basic assumption is that the sample count rate does not change throughout the counting period. This assumption does not hold true when short half-lives are encountered or when the sample is in motion (e.g., flowing through a pipe). ORTEC has pioneered lossless counting technology in the digital realm. In this method, the spectrum itself is corrected on a pulse-by-pulse basis. The ZDT method also provides accurately corrected spectra and correctly calculated statistical uncertainties.
• "Enhanced Pass Rate" mode

  Accuracy at high input count rates may be limited by the speed at which the spectrometer can store data into memory. This is called "throughput limit". Pulse stacking means that beyond a certain point, the rate of data stored to memory decreases as the input count rate further increases, thus degrading the quality of the results.ORTEC increased throughput by 30% by developing a new digital peak detection algorithm that eliminates some of the dead time associated with the pulse peak amplitude determination process.

• list mode
  For cases where the sample is moving relative to the detector, it is often necessary to measure the activity curve as a function of time. Examples of such applications include aerial surveying, land patrol surveying, and access control surveying. Usually it is required not to appear with "collection- "Dead zone" related to the "Store-Clear-Start" cycle. In list operation mode, data is streamed directly to the computer event by event. There is no relevant "dead zone". In DSPEC 50, each event is time stamped to an accuracy of 200nS.
• Ballistic loss and charge capture correction

  The ladder digital filter in the DSPEC 50 is the same as in all other ORTEC DSPEC series products. It adjusts the filter to optimize the resolution performance of large HPGe detectors, which often suffer from low-energy peak tailing when ballistic deficits are present. These large detectors are increasingly used in low activity counting applications. Adjustments are primarily automated using the Optimize feature and can also be monitored via the InSightTM virtual oscilloscope mode.

  The DSPEC 50 offers additional functionality in the form of the Resolution Enhancer, a charge trap corrector that can be used to reduce peak resolution degradation in neutron damage detectors. Damage to the lattice by neutrons creates "trapped" centers that retain some of the charge created by gamma-ray interactions. This will result in a low-energy tail similar to a ballistic loss, albeit for a different reason. The charge trap corrector is calibrated or "trained" for each detector so that it can add back the pulse height deficit on an event-by-event basis.

• Low frequency noise suppression (LFR)

HPGeThe performance of the detector in environments with mechanical vibrations is not very ideal. Microphonic noise reduces energy resolution by adding low-frequency periodic electrical noise to the main signal. Ground loops are also a source of low-frequency electrical noise. more and moreHPGeThe detector is designed to eliminate pairs ofLN2demand for the use of mechanical coolers, and an increasing number ofHPGeThe detector is taken out of the laboratory environment, which means an increase in mechanical vibrations.DSPEC 50Has a low frequency noise suppressor (LFR) filtering function can reduce the impact of such noise sources.

DSPEC 50 display mode
The large color display can be used for initial setup of network connections. Provides the following multiple modes to display system status:

• Gauge mode
  Gauge mode provides an easy-to-read display of system acquisition status using an analog dial. A green background means "counting".
• big number mode
  The large digital display mode uses large font digital display, allowing you to view the system operating status from a distance.
• chart pattern
  The chart continuously displays the count rate, dead time, and gain stability period during the data acquisition process to ensure that everything is normal. Gain stabilization is only displayed when the gain stabilization function is turned on.
• Spectrum display mode
  Spectrum display mode provides real-time acquisition of spectrum data display, and labels allROI. In addition, the net peak area of ​​the ROI can be set for activity estimation via live time and a simple user-supplied conversion factor. Allows activity estimates to be displayed on the screen.
• display settings
  An easy-to-use display settings screen lets you choose what content users want displayed and for how long. It is also possible to display user-providedJPG file
  
  

Control device via software
DSPEC 50 can be controlled by a computer and supports a variety of ORTEC application software, such as MAESTRO, MAESTRO-Pro, and GammaVision, as well as the CONNECTIONS Programmer’s Toolkit development package. Advanced models can use the built-in web server for advanced control without the need to install any additional software. Standard models (DSPEC-50/502) include a suite of single-user MAESTRO software for setup and data acquisition. Advanced models (DSPEC-50A/502A) include a single-user MAESTRO-pro software with additional features, including support for all features of the new instrument.

MAESTRO-Pro vs. MAESTRO
Features	MAESTRO	MAESTRO-Pro
language	English	English, Chinese, German, French, Russian
spectrum file format	CHN, SPC, SPE	CHN, SPC, SPE, N42 (2006 and 2012)
DSPEC-50A/502A gate signal mode	Not supported	support
32k and 64k notation support	Not supported	support
Scale properties	Basic energy scale	Automatic and interactive energy, resolution and efficiency scaling. Scale reports and graphic displays
Peak analysis	Basic ROI area of interest	Basic ROI region of interest, multi-peak interactive fitting, fitted peak display (GammaVision analysis results)
Automation features	Basic spectrum acquisition and region of interest reporting	In addition to spectral analysis, all automation features supported by GammaVision are supported
Nuclide library editor	External nuclide library editor	Built-in editor compatible with Nuclide Navigator software
safe	Not supported	Menu permission management
External spectral viewing	WinPlot	GVPlot

show	7inch backlight colorLCDProvide status information. The information displayed can be selected by the user.
USB-2.0interface	Used to connect one or moreDSPEC 50or502The instrument is connected to a computer. on each computerORTEC CONNECTIONSThe software supports up to255passedUSBconnected device.
Ethernet connection	can be accessed via the network from one or morePCupper controlDSPEC 50. Standard10/100MEthernet connection.TCP/IPagreement. link andLEDStatus indicator light integrated inRJ-45in the connector.
System gain settings	Coarse gain adjustment:1、2、4、8、16、32、64and128。 Fine-tune the gain:0.5Arrive1.1。 The range of available gain settings supports all types ofHPGeRadiation detector. Specifically, use the standardORTECThe preamplifier (gain to minimum gain) can achieve the following energy values: COAX 187 keVto24 MeV LO-AX 94 keVto12 MeV GLP/SLP 16.5 keVto2 MeV IGLET-X 8 keVto1 MeV
preamplifier	Computer selects capacitive-resistive preamplifier orTRPPreamplifier.
System conversion gain	The system conversion gain can be determined by software at512Arrive16kcontrol between channels.
Digital filter shaping time constant	Rise time:0.8 μsto23 μs, the step size is0.2 μs。 Flat top:0.3to2.4, the step size is0.1 μs。
digital spectrum stabilizer	Controlled by a computer program, the gain sum is stabilized.
System temperature coefficient	Gain:<50 ppm/°C。[Usually<30 ppm/°C。] Offset:<full scale5 ppm/°C, the rise and fall times are12 μs, the flat top is0.8 μs. (similar to simulation6 μsplastic surgery. ) System processing capacity:LFRwhen closed>100,000 cps。LFRWhen turned on>34,000 cps. Depends on shaping parameters.
Linearity	Integral Nonlinearity:  <±0.025% over top 99.5% of spectrum. Differential Nonlinearity:  <±1% over top 99% of range.
Pulse accumulation rejector	Automatically set thresholds. Pulse pair resolution: Typical<500 ns。
Automatic digital zero adjustment	Controlled by computer. Can be set automatically or manually. PassInSightOscilloscope mode for remote diagnostics. ( ).
Digital gated baseline restorer	Computer controlled recovery rate adjustment (high, low and automatic). ().
LLD	Set a digital low level discriminator on the channel.LLDSets the following hard truncation of data in the channel.
ULD	Set a digital high level discriminator on the channel.ULDSet up hard truncation of data in the channel above.
Count rate table	MCAand/orPCThe count rate is displayed on the screen.
battery	A built-in battery is used for memory backup to save settings in the event of a power outage.

input and output

If two are installedMCA（502model), then eachMCABoth have all of the following connectors:

detector	Multi-pin connector (13W3), with the following functions: Preamplifier power supply:1 W（+12 V，-12 V，+24 V，-24 V，2 GND）。 Analog input: amplifier input. TRPinhibit. SMART-1orDIMpower supply. HVandSMART-1Detector Control (2line).
Analog input	rear panelBNCAccepts preamplifier signals of either polarity with a rise time less than the selected plateau time setting and an exponential decay time constant of40 μsto infinity (including transistor reset and pulsed optical reset preamp). Input impedance>500 W, the input is DC coupled and protected to ±12 V。
ADCgate input	rear panelBNCAccept Slow PositiveNIMInput; computer selectable as Off, Congruent, or Anti-Conformant.ADCDoors must overlap and be in front of the flat roof area0.5 μs, and beyond the flat-top area0.5 μs。InSightAn oscilloscope can easilyADCThe gate signal is aligned with the digital output pulse.
Disable input	rear panelBNCconnector accepts reset from the transistor (TRP) or pulse optics (POF) preamplifier reset signal. You can use the correctNIMlogical orTTLlevel. Disabling the input will activate protection against distortion caused by preamplifier reset. This includes turning off baseline recovery, monitoring overload recovery, and generating stacked discard and busy signals during overload. The last two signals are used internally to provide information to the dead-time correction circuitry.
USB-2.0	used forPCUniversal Serial Bus for communication.
Ethernet connection	Ethernet connection: standard10/100MEthernet connection. link andLEDStatus indicators are integrated in the connector.

electrical and mechanical

Sample change signal output terminal	rear panelBNCconnector, withTTLCompatible.
Sample ready input	rear panelBNCconnector, accepts theTTLlevel signal. Software selects polarity.
Preamplifier power output	rear panel,9needleDtype connector; available ±24 Vand±12 Vpreamplifier voltage.
Size	42.55cm width ×35.56cm depth ×15.24cm high (16.75inches wide ×14inches deep ×6inches high).
weight	DSPEC 50: 11Kilogram (24.25pounds).DSPEC 502: 11.7Kilogram (25.8pounds).
power supply	Input voltage:100-220 V AC。 Enter frequency:47-63Hertz. 110Watts.
operating environment	0° to50°C. Humidity:0Arrive95%, no condensation.
operating system	64BitWindows 8.1and7，32BitWindows 7andXP。
CE	Complies with radiated and conducted emissions, susceptibility and low voltage power supply directivesCEstandard.
NRTL	Certification passedOSHAApprovedNRTLcertification bodyTÜVSüddeutsche Group has verified that the product complies with U.S. electrical safety standards (UL/ANSI）。

Radiation detector high voltage power supply
DSPEC 50With flexible high-voltage power supply, it is not only equipped with built-in high-voltage power supply, but also supportsORTEC DIMandSMART-1Detector high voltage system.

Internal high voltage power supply

Positive output terminal	rear panelSHVconnector,+500to+5 kV. Controlled by computer. Only effective when setting the device to forward bias.
Negative output terminal	rear panelSHVconnector,-500to-5 kV. Controlled by computer. Only effective when setting the device to negative bias.
High voltage protection input terminal	rear panelBNCUsed to turn off the bias supply voltage when the detector warms up. The high voltage protection terminal must be connected to the bias protection terminal of the detector, otherwise the high voltage cannot be turned on. Remote shutdown can be set via computer controls toORTECorTTLmode. inORTECIn mode, remote shutdown has the following characteristics: An open circuit applied to the high voltage protection input indicates that the detector has warmed up; therefore, the high voltage is switched off. Read from the high voltage protection input 0.33 mAThe current indicates that the detector has reached operating temperature; therefore, the high voltage can be turned on. inTTLIn mode, remote shutdown has the following characteristics: open circuit or input>2.4 VThe signal indicates that the detector is at operating temperature. Input<0.8 VThe signal indicates that the detector is in a warm-up state and the power should be turned off. The high-voltage protection input terminal is fixed at-700 mV. For detectors without high-voltage protection circuitry, this function can be enabled byTTLMode remains open to eliminate.

DIMandSMART-1Radiation Detector Type

SMART-1

HVThe module and the detector itself are an integrated structure.

NotSMART-1

For "traditional" or "non-SMART-1"Detector,HVThe power supply adopts the detector interface module or with2meters of cable"DIM"Form.DIMThere is a mating connector for the traditional detector cable set:9needleDtype preamp power cord, analog input, shutdown input, bias output, and inhibit input. NotSMART-1detector'sDIMSAvailable with the following high voltage options: DIM-POSGE: for any non-SMART-1Positive biasHPGeDetector interface module for the detector. DIM-NEGGE: for any non-SMART-1negative biasHPGeDetector interface module for the detector. DIM-POSNAI: for use with any positive biasNaIDetector interface module for the detector. DIM-296: with296typeScintiPacktube base/preamplifier/Detector interface module with bias supply for use with14needle10grade photomultiplier tubeNaIdetector.

Front panel display

In all cases, the bias voltage and shutdown polarity are set from the computer.DSPEC 50Can monitor output voltage and off status; detector high voltage value (read only); and detector high voltage status (on/off) is displayed on the front panelLCDon the display.SMART-1Detectors provide additional "health" information by monitoring the following functions: detector temperature (read-only); detector overload status; and detector serial number (read-only).