Ludlum Ion Chamber Survey Meter

Ludlum Ion Chamber Survey Meter


Brand Name Ludlum
Model 9DP
Radiation Detected gamma & X‐rays above 25 keV; beta above 1 MeV
Operating Ranges With Sv/h units : 0–5 μSv/h, 0–50 μSv/h, 0–500 μSv/h, 0–5 mSv/h, 0–50 mSv/h
Chamber Volume 230 cm³ (14 in³) volume pressurized to 8 atmospheres (117 psi)
Accuracy +/‐10%
Response Time 5 seconds in lowest range,2 seconds in all other ranges,when measuring from 10%-90% of final value
Measurement Readouts simultaneous display of rate, integrated reading, and highest rate (peak hold)
Lcd Display 8.9 cm (3.5 in.) diagonal, 240 x 320 (H x W) pixels, TFT active matrix, 262,000 colors, 220 cd/m²
Alarms two levels of radiation alarms available, each are user programmable
Automatic Functions auto ranging, auto zeroing, auto LCD backlighting
Audio Outputs built‐in unimorph speaker, > 60 dB at 0.6 meters (2 ft.)

The Ludlum Model 9DP, Pressurized ion chamber meter, provides highly sensitive measurements of exposure and exposure rate. It can simultaneously display the exposure rate and integrated value or the highest rate seen by the instrument. The integrated value can be reset (if desired) using one of the four convenient front‐panel mounted buttons.


  • 0 to 50 mSv/h (0 to 5 R/hr) Range with μR/hr Sensitivity
  • Sunlight Readable Color Display
  • Auto Zeroing & Ranging
  • Rechargeable Batteries
  • Alarming Capability
  • Rate, Integrate & Peak Hold Readouts
  • Data Logging
  • USB Connectivity
  • Free Firmware Updates through Internet

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