Alpha/Beta Radiation Particulate Air Monitor
● Alpha/Beta Radiation Particulate Air Monitor with Internal Pump
● Measure and Alarm on Alpha and Beta Particles in Air
● Lightweight (2 lb), Battery Powered (8 hr)
● Uses Peak-Shape Fitting Algorithm, 1024-Channel MCA
● Real Time Radon Compensation
● Performs both Acute and Chronic Measurements
● Solid State, Ion Implanted, Silicon Detector
● Optional "Radon Mode" Supports PAEC Ouput
● Voice Annunciation of Status Changes and Dose
● Ethernet Output Option for Remote Monitoring
● Wireless Output Option for Remote Monitoring
● Sensitivity (239Pu): 1.5 DAC-h (Chronic) and 45 DAC-h (Acute)
The Bladewerx EpeèCAM™ is an ultra-compactcontinuous air monitor capable of real-time detection of alpha and beta radiation emitting particulates. Its flexible design provides a high performance platform for detecting trace amounts of radioactive particulates in the presence of ambient radon or alternatively for making high accuracy radon measurements. The EpeèCAM can be factory configured to measure and alarm on the presence of special nuclear materials (SNM) or to perform radon progeny measurements and report on potential alpha energy concentration (PAEC). The EpeèCAM is available with a belt clip and is small enough to be worn inside worker’s anti-C Level A suits. The close proximity of the sampling head to the wearer means much more accurate worker dose assessments and alarm indications than is possible for larger CAMs running at much higher sampling rates. Having a size less than 6 x 5 x 3 in. and weighing a mere 2 lb., it can be located virtually anywhere and is available with mounting or stand options for additional flexibility. The built-in rechargeable lithium-ion battery provides for 8-hours of continuous operation away from any electrical power source. When plugged into the supplied 12V AC adapter, it can be run continuously. EpeèCAM is designed and built to survive the rigors of industrial use. The case is manufactured from a high impact polycarbonate material and there are no hoses, cables, or protrusions to get caught on passing items or to break off. The case is gasketed to make it splash and dust resistant and connectors are protected by a removable panel. When conditions are especially dusty, the pump flow rate can be adjusted to reduce filter loading and extend filter and battery life. The pump is a high reliability model proven over years of use in personal air samplers.
The EpeèCAM is a fully standalone battery-powered CAM with audible and visual alarms aswell as voice output for alarms and data reporting. Measurements are made using a solid state alpha/beta detector viewing a filter in the flow path of the built-in 6 LPM pump. The internal Windows-CE processor board analyzes the data from the alpha multichannel analyzer and gross beta channel and performs alarm determinations and data reporting. Complete log and spectral data can be retrieved from the unit by connecting a USB memory stick or by Active Syncing to a laptop, tablet or PC. Calibration and setup are via PC connected to the mini-USB “client” port. All necessary software is provided with the unit.
Operation of the EpeèCAM is simple and intuitive, requiring no specialized knowledge. Pressing the ON button turns the unit on and monitoring begins immediately. Nothing else is required of the user. Other controls available include volume controls for the speaker and the alarm acknowledge button. The status of the instrument is displayed through the illumination of the alarm, normal or trouble LEDs located on the top and front panels. Voice output of dose and status changes through the EpeèCAM speaker or included ear bud allows for hands-free monitoring, permitting the instrument to be worn on the inside of protective garments. With the 802.3 Ethernet RadNet Output or the Wireless 802.11g RadNet Output Option installed, multiple EpeèCAMs report their status and readings to a local area network where a local laptop or PC workstation running Bladewerx RadNet Client software or other RadNet compliant client software provides remote supervisory monitoring, in real-time, of up to ten instruments.
Key to the powerful data analysis capabilities of the EpeèCAM is the state-of-the-art alpha peak shape fitting, which is used to separate the spectrum into the contributions from its constituent nuclides and quantify the spectrum counts from radon progeny and the user-defined isotope-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. Because the individual nuclide peaks are independently determined, the separation of nuclides is impervious to radon equilibrium changes and allows the beta channel reading to be compensated for the background radon interference. These capabilities contribute 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. To learn more about Bladewerx' Alpha Peak Shape Fitting - click here.
The EpeèCAM may be factory-configured for a ‘Radon Mode’ where the instrument will monitor the potential-alpha-energy-concentration (PAEC) of airborne radon and thoron progeny. Because the alpha peak-fitting algorithm separates out the individual activities of 218Po, 214Po and 212Po, the 214Pb and 212Bi beta contributions to PAEC can be determined. This allows for an exact solution for PAEC since all the individual activities of the alpha and beta decay products are known. The display units can be configured for either 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. Further, the beta channel is used to determine the RaB (214Pb) contribution to the PAEC, making this an extremely accurate radon monitor with a sensitivity of under 1 mWL.
Isotope of Interest Sensitivity and Response Time
The sensitivity of the EpeèCAM for measuring and alarming on specific isotopes of interest in the presence of a radon background is dependent on several factors including the radon background, dust loading, sample flow rate, count time settings, and, of course, the energy of the isotope of interest. The count data are analyzed simultaneously with two different user-settable count times, the shorter one referred to as “Acute” and the longer referred to as “Chronic”. In a radon background of ~2 pCi/L, a minimum detectable dose (MDD) of less than 2 DAC-h is achievable with Chronic count time of 4-hours. A simultaneously running Acute count time of 2 minutes achieves an MDD of less than 100 DAC-h.
The EpeèCAM creates log files of both the Acute (from 5- to 30-second detail) and Chronic (1-minute detail) readings, along with spectrum log files at a user-defined interval of 1 to 30 minutes. These log files are stored for later retrieval and review. The log files use the comma-separated-variable (*.csv) format, recognized by most spreadsheet and database software.
PART NUMBER: BIN-EPEE-CAM
SAMPLING HEAD AND FLOW:
Detector: Solid-state ion-implanted silicon (450 mm² active area, 300 μm depletion)
Pump: diaphragm-type, 6.0 LPM (typical), flow rate is adjustable
Filter: 37 mm Speclon™ 1.5 μm PTFE membrane or compatible 37mm PTFE filter (25 mm collection area)
MCA: 256 channel spectrum
Peak-fitting algorithm for 214Po, 218Po, 212Po and one or two additional radionuclide (e.g. 239Pu)
Acute (120 sec window) and Chronic (240 min window) sensitivities, plus net count rate alarm
Processor: Windows, 520 MHz Intel X-Scale processor
Max Count Rate: 300,000 cpm
Source Response Check diagnostic
Calibration: Electro-plated stainless steel source required for efficiency calibration. 37mm diameter with 25mm active area. 241Am or 239Pu recommended.
Alpha Energy Range: 1.0 - 10 MeV
Beta Energy Range: 150 KeV - 2 MeV
Battery powered: 7.4 V Li-Ion, 4.1 Ah (8 Hr run-time, 4-hour charge time)
Weight: 2.1 lb (1 kg)
Dimensions: 4.75 x 5.5 x 3 in. (12 x 14 x 7.6 cm) (W x H x D)
Temperature: 0 to 122 °F (-20 to 50°C)
Humidity: 5 to 100% (non-condensing)
● 4100 mA-h Li-Ion battery: BPT-LION-4100
● 6 LPM pump (SKC): BSP-PUMP-5LS
● Epeè A board: BSP-EMCA-A
● Epeè B board: BSP-EMCA-B
● Processor board: BPT-IFT4-EP
● Epeè preamp board: BSP-PAMP-E1
● Detector, 450 mm²: BPT-DETC-EP450
● Ear bud: BPT-EARB-M1
● AC adapter/charger (U.S.): BPT-ACADP-1222