- The Hawk Radius is a ruggedized solution for monitoring both ambient and elevated levels of ionizing radiation. Like a Hawk with its remarkable vision, the Hawk Radius Probe “sees” things that other probes cannot. The high sensitivity weatherized pancake sensor can provide early warning of changing ambient radiation conditions, while the energy compensated detector can accurately report penetrating gamma radiation dose rate at elevated levels. Radius probes are typically deployed as part of an environmental radiation monitoring program, or for safety and security systems. In its standard configuration the probe detects beta, low energy gamma and x-radiation with one channel and energy compensated penetrating gamma radiation levels with a second channel. It can be configured to detect alpha radiation as well. The Hawk® Radius has been deployed worldwide in demanding conditions for protecting communities and collecting environmental radiation data. It can be deployed easily and requires minimum maintenance. The Radius is compatible with Medcomʻs GeigerLink adapter and the IMI Gateway App for use with personal computers. It can also be used with most data loggers including popular Campbell Scientific models. It is also compatible with Safecast Pointcast Devices, as deployed by Safecast worldwide and around damaged reactors at Fukushima Daiichi. The Hawk Radius and its predecessors have been deployed for 25 years in Northern Massachusetts by nonprofit C-10 in partnership with Massachusetts Department of Public Health.
- Detector 1: Halogen-quenched “pancake” Geiger-Mueller tube (LND 73126). Effective diameter 1.75″ (45 mm). Mica window density 1.5-2.0 mg/cm2
- Gamma Sensitivity: 3500 CPM/mR/hr referenced to Cs-137
- Beta Efficiency (for 4Π at contact):
+ 14C: 49 keV avg., 156 keV max., 5.3%
+ 210Bi: 390 keV avg., 1.2 MeV max., 32%
+ 90Sr: 546 keV avg., 2.3 MeV max, 38%
+ 32P: 693 keV avg., 1.7 MeV max., 33%
- Measurement Range: 0 to 5 mR/hr or 0 to 18,000 CPM calibration check, typical maximum 10 mR/hr or 35,000 CPM
- Window Shield: NCR2/2 Mylar laminated to a copper beryllium screen
- Detector 2: Halogen-quenched energy compensated Geiger-Mueller tube (LND 7128). Effective diameter .36″ (9.1 mm)
- Gamma Sensitivity: 1000 CPM/mR/hr referenced to Cs-137
- Measurement Range: 0 to 5 mR/hr calibration check, typical maximum 10 mR/hr or 10,000 CPM
- Temperature Range: -40° to 75°C (-40° to 167°F)
- Power Requirement: 3.5 to 15 V DC
- Current Drain: <1 mA (typical) at background radiation levels, to 25 mA (max) @ 12 V DC in high fields.
- Lightning Surge Protection: to 600 W for 1 ms
- ESD Protection: up to 16 kV
- Size (L x W x H): 6.25″ x 3.15″ x 2.35″ (157 mm x 78 mm x 60 mm). Connector adds 0.6″ to length.
- L-Bracket: 6.25″ x 3.25″ x 2.25″ (157 mm x 83 mm x 57 mm). Thickness 0.1″ (2.54 mm).
- Probe Weight: 21.1 oz. (599 gr.) With Bracket: 25.6 oz. (726 gr.)
- Probe Housing: Anodized aluminum and polycarbonate. Water resistant.
- Cable: Waterproof. RFI-shielded. UV-resistant jacket. 10 meter length.
- Connector: M12 Euro. Waterproof. RFI-shielded.
- Computer Interface: Optional cable with RS-232 or USB 2.0 interface.
- Options and Accessories: replacement window shield, window screen without mylar, RS-232 or USB 2.0 cable kit, quick-release pole-mount adaptor, USB data acquisition adapter, calibration fixture New! Hawk EMS (available separately) is a wall-mount monitoring and alarm system that provides power and display for the Hawk® Radius probe, as well as alarm functions, siren, flashing light, and relay output for HVAC or security system trigger. Please see our monitoring system page for further details.