Thermo Scientific™

RO-20 Ion Chamber Survey Meters

Related applications:

Radiation Detection Measurement

Thermo Scientific™ Model RO-20 is a portable air ionization chamber instrument used to detect beta, gamma and X-radiation. Features five linear ranges of operation to measure exposure from background to 50 R/h full scale.

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Ionization chamber is vented to atmospheric pressure and is specifically designed to have a flat energy response into the X-ray region.
  • The detector is fully compensated over the operational temperature range for output accuracy within 10% ± 0.5 mR/h; eliminates need for temperature correction
  • Each instrument is factory calibrated to gamma radiation
  • A single rotary switch turns the instrument off, checks the batteries, checks the zero setting, and selects the range of operation
  • An ergonomically located switch illuminates the meter
  • Internal switching of ranges is accomplished with reed relays, eliminating the mechanical swing arms typically used with portable ion chamber survey instruments
  • Chamber has a diameter of 7.32cm (2.88in.) and a volume of 220cm3 (13.4 cu. in.)
  • Detector has 640 mg/cm2 phenolic walls inside a 1.6mm (0.063in.) aluminum wall case for a total thickness of approximately 1,000 mg/cm2
  • A 7.9mm (0.31in.) thick phenolic sliding beta shield with a positive friction lock is mounted on the bottom of the chamber
  • The shield thickness is approximately 1,000 mg/cm2
  • The chamber window is comprised of two layers (one on the chamber, one on the can) of 25 micron (0.001in.) mylar, approximately 7 mg/cm2 total
  • Measures gamma or X-ray exposure rate
  • Large backlit display
  • Long battery life
  • Sliding shield for beta measurements
  • Seals used at openings for dust and water resistance; detector is protected by a silica-gel dryer
  • Options include 137Cs gamma check source (CS-7A) and carrying strap (ZP11466031)