G5 "Fidler" Sodium Iodide Probe


Available in standard and ruggedized forms, the G5 "Fidler" is capable of detecting plutonium and other gamma and x-ray sources across the energy spectrum. The G5's origins lie in its conception as a component of the "Broken Arrow" emergency response instrumentation kits.
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In order to assist users in the handling of the highly responsive G5 x-ray/gamma probes, the G5 accessories make survey work more convenient by enabling the G5 probes to be held or mounted in various positions according to user need. A rubber-footed platform provides a stable base when resting the probe on a horizontal surface while different handles & holders enable the G5 to be used in horizontal, vertical, and out-of-reach positions.

The G5 consists of a 5 inch diameter (127 mm) Nal (TI) crystal/photomultiplier assembly.  Principal use: detection of 10-100 keV gamma emissions from degraded Pu or Pu-Am spectra.  Secondary use: an excellent 125I detector.

  • Ruggedized version for field use includes a secondary scratch-resistant kapton window
  • Further improve the sensitivity by use of a hand held rate meter featuring a single channel analyser (e.g., Analyst, Electra, or Delta 5)
  • Connector: MHV

G5 "Fidler" Sodium Iodide Probe Accessories

The G5HH and G5HH-R (for the ruggedized version) handles let you hold the probe so that its long axis is in a horizontal orientation while surveying. A platform with three rubber feet provides a stable base for resting the probe on a horizontal surface.  For a vertical orientation (as when surveying the ground, floors, or other horizontal surfaces), use the G5VH handle. This handle fits both standard and ruggedized G5s, and its length is adjustable.

 

 G5 "Fidler" Sodium Iodide Probe
 Product# Price  Product Description  
       
 G5HHR      -    Horizontal handle, ruggedized version   SELECT  
 G5HH      -    Horizontal handle, standard G5   SELECT  
 G5VH      -    Vertical G5 handle   SELECT  
 G5VHX      -    Military vertical handle   SELECT  
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Specifications:
Radiation Detected :Gammas and X-rays >10 keV
Pulse Height Resolution :< / = 30% FWHM for 109Cd (23 keV)
Scintillation Crystal :Nal (Tl), 5” diameter x 0.010” thick (127 x 1.6 mm)
Radiation Entrance Window :Beryllium, 5” diameter x 0.10” thick (127 x 0.254 mm)
Optional Window Materials :Low background Be for maximum low-energy sensitivity; reduces back ground count rage ~24% Aluminum; reduces efficiency by ~20%
Housing :Aluminum, 0.020” (0.50 mm) thick, satin chrome finish
Photomultiplier Tube :5” (127 mm) diameter
Light Shield :Mu metal, satin chrome finish
Operating Voltage :Variable
Maximum Voltage :+1600 volts
Voltage Divider :Internal, integrally-wired; 14-pin base optional
Termination :Single MHV connector; other terminations available
Temperature Range :+39 to +109 degrees F (+4 to +43 degrees C)
Temperature Rate-of-Change :18 degrees F (10 degrees C) per hour
Size :Standard = 5.562” maximum diameter x 10.125” long (141.3 x 257.2 mm) Ruggedized = 6.250” maximum diameter x 10.583” long (158.7 x 268.8 mm)
Weight :Standard = 6 lb (4.1 kg)