Radiation Alert Frisker

Specifications

Detector

• Halogen-quenched GM tube with thin mica end window.
• Mica window density 1.5-2.0 mg/cm2.
• Effective diameter of window is 45 mm (1.77 in.).
• Side wall is .012 inch thick.

Operating Range

• Up to 50 mR/h. Instrument begins readings in µR/h and changes to mR/h at 1000 µR/h
• Up to 500 µSv/h. Instrument begins reading in nSv/h and changes to µSv/h at 1000 nSv/h

Energy Sensitivity

• Detects Alpha down to 2 MeV. Detects Beta down to .16 MeV; typical detection efficiency at 1 MeV is approx. 25%.
• Detects Gamma down to 10 KeV through the detector window.
• 3600 CPM/mR/hr (137Cs).
• Smallest detectable level for 125I is .02 µCi at contact.
• Radiation Frisker Energy Response

Accuracy

• Reference to Cs137 – Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration

Anti-Saturation

• Readout will OVERRANGE in radiation fields as high as 100 times the maximum reading.