RO-20 Ion Chamber Survey Meter

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Measures gamma or x-ray exposure rate
Temperature compensated measurements
Sliding shield for beta measurements
Large, backlit display
5 ranges up to 50 R/h
Extended battery life
Non-mechanical range switching

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

The 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 temperature compen-trument 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 ergonom-ically 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.

RO-20 Ion Chamber Survey Meter

Detector
The RO-20 detector is an air-filled
ionization chamber. It has a diameter of 7.32 cm (2.88“) and a volume of 220 cm3 (13.4 in3). The detector has 640 mg/cm2 phenolic walls inside a 1.6 mm (0.063”) aluminum wall case for a total thickness of approximately 1,000 mg/cm2.

A 7.9 mm (5/16”) 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) 25 micron (0.001”) mylar, approximately 7 mg/cm2 total.