Model 9DP-1 Ion Chamber Survey Meter – Ludlum

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Ludlum designed the Model 9DP-1 Ion Chamber Survey Meter for radiography work where pulsed fields are being measured. This instrument correctly integrates 50 nanosecond pulses (and wider) that other systems typically miss or measure incorrectly.

The detector chamber is only pressurised to 1,36 atm (20 psi). The device has a nice 256-colour, bit mapped display, which provides an optimised presentation of the data. The instrument also has with icons that inform the user of the active functions and instrument status and which make it simple to use.


This chamber survey meter has an alarm that uses colour changes in the screen and an acknowledgeable audio output. It also has a rechargeable battery that delivers up to 30 hours of operation between charges.

The instrument writes the data in csv format for convenient retrieval.

The device measures both exposure and exposure rate, and can simultaneously display the exposure rate, integrated value and highest rate seen by the instrument.



  • Special design for measuring pulsed fields
  • Low pressure chamber is non-hazmat
  • Range from 0-500 mGy/h
  • Sunlight readable colour display
  • Auto zeroing & rangin
  • Rechargeable batteries
  • Alarming capability
  • Data logging

If you want to know more, read our article, or take a look at our partner’s website!


Model 9DP-1 Ion Chamber Survey Meter
9DP instrument overview
9DP control panel overview
Decompressing the Ion Chamber


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Datasheet Model 9 DP*-1 Ion Chamber Survey Meter Ludlum

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