Ion Chamber Survey Meter - Model 9-3
CE Seal

The Ludlum 9-3 ion chamber is a rugged air ionization chamber for performing beta-gamma dose rate measurements over a five-decade span ranging from background to 500 mSv/h (50 R/hr). The chamber wall, including the instrument case, is 1000 mg/cm². A 1000 mg/cm² retractable beta shield allows beta measurement with a 7 mg/cm² window. The six-position switch selects Off, x10K, x1K, x100, x10 and x1. Each range has a front-panel, mounted calibration control. Other features include an audio output, reset, and zero adjust capabilities. Means are also provided to zero the electrometer leakage current.
An adjustable shoulder strap, included, provides a convenient and comfortable mode to carry the instrument during surveys.

Alternate Instruments

Model 9-4, Same as Model 9-3, less audio output with added pressure compensation and PC controlled calibration.