RO-20 Ion Chamber Survey Meters

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.

• 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)