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GM Pancake Probe
Home / Fluke Biomedical

GM Pancake Probe

Designed for use in conjunction with the ASM-990 Series and other standard GM survey meters, the 489-110D can detect alpha, beta, and gamma radiation. It is configured for operating convenience in table-top and floor surveys as well as surveys of personnel and equipment.

Categories: Fluke Biomedical, Raysafe

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  • Description
  • Features
  • Specifications

Designed for use in conjunction with the ASM-990 Series and other standard GM survey meters, the 489-110D can detect alpha, beta, and gamma radiation. It is configured for operating convenience in table-top and floor surveys as well as surveys of personnel and equipment. Prime applications for this probe include nuclear medicine counter tops and frisker stations, leakage detection for low energy diagnostic x-ray machines, geological and environmental surveys or any place where there exists the suspicion that some form of radiation is present, especially emergency response teams. For storage and carrying ease, the probe fits into the standard handle clip on a survey meter.

The GM probe comes in two configurations: 489-110D with an ABS plastic housing, MHV connector, and foam grip, or 489-110E with a BNC connector. This selection of connectors provides the ability to attach the GM probe to most GM survey meters on the market. Replacement foam grip handles are available: 489-130-44. This same probe design is available in a rugged metal housing as 489-110C.

Features

Key Features

  • All purpose GM Pancake Probe detects alpha, beta, gamma, and x-ray radiations
  • High detection efficiency
  • Lightweight, ergonomic design
  • Detachable probe cable
  • BNC or MHV connector
  • Easy to decontaminate

Specifications

Product Specifications
Detector
 Halogen-quenched “Pancake” GM tube
Type
 Pancake alpha, beta, gamma, and x-ray with thin pancake window
Radiation detected
 Alpha above 3.5 MeV, beta above 35 keV, gamma and x-ray above 6 keV
Applications
 • All purpose sensitive alpha, beta, and gamma and x-ray probe
• Nuclear medicine counter tops
• Detects leakage from diagnostic x-ray machines, especially mammography
• Geological surveys
• Scrap metal yards
• HAZMAT
Typical background (shielded)
 30 CPM
Maximum exposure rate
 80 mR/h (800 µSv/hr)
Nominal sensitivity to 1 mR/hr of 60Co
 3500 CPM
Replacement GM tube part number
 P-115
Wall material
 Stainless steel with mica window
Wall thickness
 1.5 to 2.0 mg/cm2
Window
 15 cm2 (1.75 in Ø) mica, 1.4 to 2.0 mg/cm2
Active length
 1.5 in Ø (38mm)
Quenching gas
 Neon & halogen
Operating voltage
 900 V
Compatibility
 Compatible w/ all GM survey meters
Humidity range
 0 to 95%
Operating temperature range
 – 65° to + 185°F (- 56° to + 85°C)
Pressure range
 To 5 psig
Protective Screen
 Stainless steel, hexagonal pattern providing 89% open area
Construction
 ABS plastic housing and foam grip handle
Cable
 Shielded cord, approximately 4.5 ft long MHV coaxial connector or BNC connector
Dimensions
Detector housing:  2.5 (w) x 4.25 (d) x 0.875 in (h) (6.36 x 10.8 x 2.2 cm)
Handle:  1 in Ø x 6.25 in (d) (2.5 x 16.5 cm) (excluding connector)
Diameter of probe:  2.6875 in (68 mm)
Length of probe:  9.75 in (248 mm)
Weight
 Approx. 1 lb (0.45 kg)
Efficiency
 The GM Pancake Probe efficiency is shown below. In a recent performance check, the numbers shown represent typical results obtained:
14C  5%
99Tc  12%
137Cs  24%
90Sr  59%
36Cl  26%
241Am  8%
129I  2%
230Th  15%
239Pu  12%
NOTE:  The efficiency formula used to calculate the % Efficiency is: Eff.%=(CPM x 100) / DPM

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