Ludlum 2401-P Pancake GM Survey Meter
The Ludlum 2401-P is a compact, pocket-sized radiation survey meter designed for low-level surface contamination monitoring. It is equipped with a 2.4-inch (6.1 cm) diameter pancake Geiger-Mueller (GM) detector housed behind a protective stainless steel screen. This versatile instrument can detect alpha, beta, and gamma radiation, making it suitable for use in medical, nuclear, and industrial applications.
Technical Specifications
Model: 2401-P
Detector Type: Pancake GM tube, 2.4 in (6.1 cm) diameter
Window Area: Active: 15.51 cm², Open: 12.26 cm²
Sensitivity (137Cs gamma): 3300 cpm per mR/hr
Measurement Scales: Three-decade analog meter (×1, ×10, ×100 multipliers)
Response Time: Typically 11 seconds (10% to 90% of final reading)
Audio Output: Click-per-event (audible), can be disabled via selector switch
Power Supply: 9V battery, 250 hours typical life (alkaline)
Dimensions (H × W × L): 4.6 × 8.4 × 13.5 cm (1.8 × 3.3 × 5.3 in)
Weight: 0.4 kg (0.9 lb) including battery
Certifications: CE
Portable Radiation Monitoring
The 2401-P is designed for quick and easy field use. The large 6.4 cm (2.5 in) analog meter displays radiation levels, and the three-decade range switch allows measurements from low background levels to higher activity sources. The built-in audio "click-per-event" provides immediate feedback, and the meter includes a "BAT OK" indicator to ensure proper battery function. The instrument is self-contained and requires no external accessories, making it ideal for emergency response, medical decontamination, and industrial safety surveys.
Application Domains
This survey meter is commonly used in nuclear medicine departments to locate lost radioactive seeds, in health physics for surface contamination surveys, in emergency response for environmental monitoring, and in industrial settings for detecting low-level radiation sources.
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