SabreBPM²  Portable Beta(Alpha) CAM

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SabreBPM2 portable alpha beta air monitor for use in workplaces or for emergency response with gamma background subtraction

The Bladewerx SabreBPM² Portable Beta CAM is a lightweight, battery-powered, Beta Particulate Monitor that can be used as a portable workplace monitor or a portable CAM for emergency-response assessments. It is designed to provide workers with an early warning of an airborne release of beta emitting particulates.


Using the acclaimed Bladewerx peak-fitting software for radon-background subtraction means more accurate workplace measurement and alarm indications. A self-contained pump, built-in detector head, alarm light, sonalert and battery operation, allow the ultimate in beta air monitoring portability. A solid-state, ion-implanted, silicon detector and reliable 1024-channel multichannel analyzer provide the input for an embedded processor board that performs beta detection and the alpha spectral analysis for radon background compensation. An integrated 7-LPM pump, lithium-ion battery and charging electronics complete the package allowing battery operation of more than eight hours.

The SabreBPM² uses

37mm Speclon Filters

Visit our Filter Media page for more information

Speclon PTFE membrane filters for use with the SabreBPM

Alpha Peak-Shape-Fitting

State-of-the-art alpha peak shape fitting is used to separate the spectrum into the contributions from its constituent nuclides and quantify the spectrum counts from radon progeny and optionally up to two isotopes-of-interest.   Alpha peak shape fitting is a technique that uses the profiles of multiple alpha isotope peaks to create a composite curve which best fits the actual spectrum counts.  Because the individual nuclide peaks are independently determined, the separation of nuclides is impervious to radon equilibrium changes and contributes to a very low probability of false alarms.  Precise fitting of the 218Po tail results in excellent sensitivity—superior, in many cases, to instruments sampling at 40 LPM.

Spectrum Chart showing raw counts and the fitted spectrum line on a SabreAlert

Optional Alpha Monitoring

Though a beta particulate monitor, the SabreBPM² can be configured to monitor up to two alpha isotopes of interest, simultaneously with beta monitoring.  The alpha isotope counts are quantified from the radon background using the peak-shape-fitting algorithm.  Isotopes have individual alarm set points and can also be remotely monitored if paired with the RadNet or ASCII output options.

SabreBPM2 User Interface with menu, meter, and data log displayed

User interface Display

An integrated 5.5-inch LCD and touch screen displays detailed information on the status and readings while in operation.  The dose estimate of the isotope(s) of interest and instrument status are prominently displayed at all times, while a window below either displays the historical readings and battery status, or displays the current spectrum.  The user mays switch between the two displays from the View menu.


Data Logging

The SabreBPM² creates log files of both the Acute (from 1- to 30-second detail) and Chronic (1-minute detail) readings, along with spectrum log files at a user-defined interval.  These log files may be saved in the internal memory, or stored on a removable SD memory card, for later retrieval and review.  The log files use the comma-separated-variable (*.csv) format, recognized by most spreadsheet and database software.

Sensitivity and Response Time

The sensitivity of the SabreBPM² is dependent on several factors including, radon background, filter type, flow rate, acute and chronic window settings, and, of course, the energy of the isotope of interest.  MDD is less than 0.03 DAC-h for 137Cs using a 120 second acute analysis time in a 15 µR/h gamma background.


Optional Remote Monitoring

With the wireless RadNet Output Option installed, multiple SabreBPM²s report their status and readings to a wireless access point, up to 300 feet away, networked with a laptop or PC running Bladewerx RadNet Client software, or other RadNet compliant client software.  This capability allows remote supervisory monitoring, in real-time, of up to ten work areas.  Remote monitoring can also be performed with the ASCII Protocol Output Option, either over WiFi or RS-232 connection.

Beta Acute Chart

Optional Radon Mode

The SabreBPM² may be factory-configured for a ‘Radon Mode’ where the instrument will monitor the potential-alpha-energy-concentration (PAEC) of airborne radon progeny.  The display units can be configured for either American units of milli-Working Levels (mWL) and WL-h, or SI units of µJ/m³ and µJ-h/m³.  Because the individual progeny concentrations are known, the effective (dis)equilibrium ratio of radon progeny can be determined and displayed.  This feature can provide useful insights into the  ‘age’ of the air sampled.


Optional Gamma Guard Detector

An internal guard detector is also available, providing real-time compensation for changing ambient gamma background levels.  Both radon and gamma subtraction is controlled with a user-set subtraction factor.  Standard units offer fixed subtraction when a guard detector is not present.

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Take a look at the full SabreBPM² Spec Sheet

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4529 Arrowhead Ridge Dr. SE

Rio Rancho, NM 87124, U.S.A.