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 • Monitors alpha, beta and gamma
• Built-in pancake detector
• Built-in speaker
This small 3 range surface rate meter has a built-in 2” diameter pancake GM detector. Read-out is in counts per minute (and mR/hr). The detector window is recessed and protected by an aluminum grill. The instrument will monitor alpha, beta and gamma radiation with a built-in audio to immediately signal the presence of radiation contamination. Anti-saturation circuitry keeps meter needle at full scale in high radiation fields. Tested to 100 R/hr. The small size, light weight and large detector area make this a very useful monitor for surveying bench tops or checking hands, clothes and fingertips for almost any radioactive contamination including: I-125, 1-131, P-32, C-14.
Specifications
Meter: 2 1/2” (6 cm)
Ranges: 3 ranges, linear - 0-500, 0-5,000, 0-50,000 cpm (0-.15, 1.5, 15 mR/hr)
Switch Position: Off, Battery Test, x100, x10, x1
Audio: Internally mounted speaker
Detector: Halogen-quenched “Pancake GM tube”
Diameter: 2” (5 cm)
Window Diameter: 1 3/4” (5 cm)
Window Thickness: 1.5 mg/cm2
Background: Typical 50 cmp, Thin profile of tube (13 mm) gives low background
Efficiency: 100% for all betas and alphas that have the energy to
penetrate the thin window.
Voltage: 900V nominal
Gamma Sensitivity: Nominal is 150 cpm/mr/h (based on CS-137)
Physical Dimensions: 3” W x 5 1/4” L x 2 1/4” T (8 x 13 x 6 cm)
excluding meter and handle
Feet: Replaceable neoprene feet for easy sliding on bench or desk top without contaminating bottom face of instrument or detector
Calibration: Single master calibration pot as well as individual calibration pots for each scale
Power: 9 volt nominal “transistor battery” Eveready 1222 carbon
or Eveready E146X mercury or equivalent
Current Drain: 3 mA typical
Handle: Swivel Type polished anodized aluminum
Weight: 22 oz (625 g.)
Battery Life: 100 hours in normal operation
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