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LaBr for Environmental Monitoring
Confidence factors when identifying radioactive materials are critical to a successful mission. To give your end users an edge over
traditional identification methods, the latest in MCA and algorithm technology has been coupled with a new detector material for
gamma ray collection. The SAM Revealer comes standard with a 1.5” x 1.5” lanthanum bromide detector (LaBr3) and the QCC™
statistical enhancement transform which provides background subtraction in real time and therefore the highest degree of
sensitivity. For example, high sensitivity (typically 250 nrem/hr/sec) means fewer missed radioactive sources, tasks are
completed faster and the number of reports with poor statistics are greatly reduced when brought back for analysis.
The SAM is designed to operate in any background (high or low), including Bremsstrahlung or Compton, with the
interference subtracted in real time (one second or less). With this advanced identifier, your spectroscopic data collection, isotope
identification and data analysis reporting are all automated with exceptional resolution. This large improvement in resolution also
allows quick identification of mixed radionuclides, a typical problem with the overlapping peaks of lower resolution sodium iodide detectors.
Features
• Industry Leading Spectral Resolution
• No Warm Up or Waiting Period
• One Hand / One Glove Operation
• Network Ready with ANSI N42.42 Data Transmission
• Search and Confirm with One Instrument
• COTS Batteries for Rapid Deployment
• Highest Sensitivity and Response in Real Time
• Operates Accurately in High Background
• Auto Calibration and Stabilization with NORM
• Cambio or Peak Easy Compatible
• Ships with ANSI-Viewer Software
• DOE Reachback Ready, JAC Ready
Applications
• Homeland Security
• Baggage and Cargo Screening
• Field Confirmation of Pager Alarms
• Customs and Border Protection
• Environmental Protection
• DHS / DNDO Reachback Support (ANSI)
• GPS Enabled Plume or Land Mapping
• GPS Enabled Perimeter Set-Up
• Fixed (Semi-Permanent) Monitoring with ID
Peak Resolution
One critical specification for gamma ray detectors is peak
resolution. In nuclear spectroscopy, we often express the
resolution as a percentage at 662 keV (cesium). For the SAM
Revealer, the typical resolution is 2.8%. This is about 2.5
times better than sodium iodide detectors and therefore
allows separation of many closely spaced peaks.
The Lanthanum Bromide Advantage
Because your applications for isotope identification vary, and
user skill level varies, we offer several modes of operation.
Training requirements are reduced by the handy user interface
and color-coded isotope categories. A SAM Revealer Easy-
Mode simplifies screening and identification activities. In
cases where you are identifying special nuclear material or
masked isotopes, enhanced peak separation as found in the
SAM Revealer will be helpful in giving you high confidence
reporting. For example, separating the conflicting and
overlapping lines of multiple sources such as Cs137 and
Th232, Cs137 and Ra226 or Co60 and Ra226, is
challenging with low resolution detectors (6% or greater).
Advanced algorithms can compensate for some of the
shortfall, but high resolution from a LaBr3 detector can provide
identification with a high degree of confidence. One of the
best advantages of LaBr3 is clearly seeing the gamma and x-
ray peaks of plutonium. The one highly penetrating NaI peak
of Pu239 is now clearly seperated into three easily recognized
peaks with LaBr . The first line responder can easily email the
SAM Revealer data report (complete with GPS data, ANSI
N42.42 compliant) to the appropriate scientific support
center for further analysis. These enhanced spectra will be of
great value to those responsible for evaluating and
responding to critical situations.
- Independant Evaluation Report Summary
Executive Summary
Each instrument was evaluated and rated with regard to published specifications, actual radioisotope identification capabilities and actual first responder use/feedback. The evaluation was performed in a single day with all instruments present. The SAM 940™ was fastest at finding and identifying radioisotopes followed by the IdentiFINDER™ and the InSpector™ 1000. The IdentiFINDER™ was smaller, lighter and more rugged. The InSpector™ 1000 and the SAM 940™ were comparable in the identification accuracy at varying radiation levels. The IdentiFINDER™ did not perform as well as the others in terms of accuracy and sensitivity at greater distances (i.e. lower radiation levels). Responders preferred the SAM 940™ due to the speed, ease of use and the color screen capabilities. See the Results, Discussion and Conclusions sections for more detailed information. "
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