RO-20 Ion Chamber Survey Meter

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Product pricing and specifications published on this Web site are subject to change without notice. For complete up-to-date information, call JRT Associates.

©JRT Associates 2008

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.

Call JRT Associates for pricing and additional information on this product.

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.