Survey Meter [Surface]

This compact 3-range surface rate meter is equipped with an internal 2-inch diameter pancake GM detector and built-in speaker. The detector's thin window is recessed and protected by an aluminum grill. Its small size, light weight, and onehand operation make this unit an ideal tool for surveying bench tops and other surfaces, and for checking hands and clothing for radioactive contamination. The meter face reads in both cpm and mR/h. Anti-saturation circuitry keeps meter needle at full scale in high radiation fields.

 

Features

• Monitors alpha, beta, and gamma
• Built-in pancake detector
• Range: 0 to 50,000 cpm, 0 to 15 mR/hr
• Three multiplier ranges: x1, x10, x100
• Built-in speaker
• Anti-saturation circuit prevents false “zero” readings
• One-handed operation

 

Specifications

Meter Dial	2.5" (6 cm) rectangular
Ranges	Three linear 0-500; 0-5,000; 0-50,000 cpm (0-0.15; 0-1.5; 0-15 mR/h)
Switch Positions	Off, Battery Test, X100, X10, X1
Audio	Internal speaker
Detector	Halogen-quenched pancake GM tube
Diameter	2'' (5 cm)
Window Diameter	1.75" (4.5 cm)
Window Thickness	1.5 mg/cm2
Background	Typical 50 cpm
Efficiency	100% for all betas and alphas that have the energy to penetrate the thin window
Gamma Sensitivity	Nominal is 150 cpm/mR/h (based on Cs 137)
Power	9-volt battery (Eveready 1222 carbon, E146X mercury, or equivalent)
Battery Life	Typically 100 hours under normal operation
Dimensions	8 x 13 x 6 cm (excluding meter and handle)
Weight	625 g