Specifications

Sampling Head and Flow

• Detector: solid-state ion-implanted silicon (450 mm² active area, 300 µm depletion)
• Air Flow Measurement: electronic mass flow control
• Pump: internal diaphragm-type, 7.0 LPM max flow rate
• Filter: 37 mm (1.5 in.) PTFE membrane or glass fiber filter (25 mm [1 in.] collection area)

Beta Data Analysis

• Single beta channel with upper/lower discriminator setting
• Gamma guard detector provides real-time compensation for changing gamma background levels
• Acute (fast response, 120 sec. window) and chronic (high sensitivity, 240 min. window) measurements, plus net count rate alarm
• Beta Efficiency: 7 - 18%, energy dependent

Alpha Data Analysis

• MCA: 1024-channel ADC binned to 256 channel alpha spectrum
• Radon compensation with alpha peak-shape-fitting, plus fixed background subtraction
• Acute (fast response, 120 sec. window) and chronic (high sensitivity, 240 min. window) measurements, plus net count rate alarm
• Monitoring of up to two alpha isotopes of interest
• Alpha Energy Range: 1.0 - 9.0 MeV

Operation

• Processor: Windows CE-based
• Max. Count Rate: 600,000 (alpha + beta)
• Source Response Check diagnostic
• Calibration: electro-plated stainless steel sources required for efficiency calibration, 32 mm dia. with 25 mm active area
• Display: 140 mm (5.5 in.) LCD resistive touch screen with backlight; Upper window shows dose and instrument status; Lower window shows either historical readings and battery status or current alpha spectrum; Top menu bar provides access to configuration and calibration functions
• Display Update Rate: 1 to 5 sec. (adjustable)
• Control Buttons:
  • Units: cycles the upper window display units between Bq-h/m³, Bq, CPM, and Bq/m³ (or DAC-h, pCi, CPS, and DAC)
  • Alarm Ack: silences alarm audio and clears latched alarms
  • Channel: cycles the upper window display between beta, alpha isotope channels, and flow rate
• Alarms: separate chronic dose, chronic concentration, and acute dose alarms can be set for beta measurements and for each alpha isotope. Visual/audio alarm stack includes red alarm light and audible alarm (other indicator options are available). Alarm audio intensity is 94 dB at 1 m (3 ft). Recognizes and alarms on any equipment failure.
• Data Logging: acquired data is saved in CSV format to internal memory or to an SD memory card. Logged data includes acute and chronic dose readings, as well as spectrum log files. A detailed log trend of at least three days of data can be shown in the display.

Physical

• Temperature Range: -20 to 50 °C (0 to 122 °F)
• Humidity: 0% to 100% (non-condensing)
• Environmental Rating: IP rating of 53
• Power: 8.4 V Li-Ion battery (6.6 Ah, 8-hour run-time, 4-hour charge time) or wall mount transformer (100 - 250 Vac, 50 - 60 Hz, single phase)
• Size (W x H x D): 25 x 30 x 13 cm (10 x 12 x 5 in.)
• Weight: 3.8 kg (8.3 lb)