RO-20 Ion Chamber Survey Meter Specifications

ENERGY RESPONSE
Photon Response Reference to 137Cs measured through the bottom with the slide closed, the energy response is:
   ± 30% from 8 keV to 1.3 MeV with    the open slide facing the source.
   ± 15% from 33 keV to 1.3 MeV    with the closed slide facing the    source.
   ± 15% from 55 keV to 1.3 MeV    through the side of the instrument.
Beta Response Uranium Slab: 30% of true mrad/h field behind 7 mg/cm2 window with RO-20 resting on slab, slide open. 90Sr90Y: Approximately 93% of true mrad/h field at 30 cm with slide open.
Fast Neutron Response (PuBe) Reads approximately 8% in mR/h of true neutron field in mrem/h.

RADIOLOGICAL
Radiation Detected Beta, gamma, and x-ray.
Ranges Five linear ranges: 0-5, 0-50, 0-500 mR/h and 0-5, 0-50 R/h.
Meter Scale length, approx. 7.6 cm (3”), 2% accuracy. Linear markings from 0 to 5 in 50 minor increments. The meter is back-lit.
Response Time 90% of final reading within 5 seconds; see options below for faster response.
Linearity Within ± 5% of full scale.
Battery Dependence Reading is independent of battery voltage when the battery check indication is in the green arc.
External Controls Range switch, including Off, Zero, and Battery checking positions. Zero knob used to set meter to zero when Zero position of range switch is selected or when in no significant radiation field. Light switch, for meter light.
Internal Controls Five calibration controls, one for each range.

Batteries Main power: Five "C" cells.
Chamber Bias: Ten 3 volt lithium coin cells, 30 volts.
Battery Life "C" cells, widely variable according to RO-20 usage and battery type. Typical ZnC: mR/h ranges, 2900 hrs. All other ranges, 150 hrs. Typical Alkaline: mR/h ranges, 6900 hrs. All other positions,
350 hrs. Frequent or continuous use of the light will reduce battery life significantly. Thirty volt
chamber bias battery life: Totally dependent upon the usage of "Battery 2" position of the range
switch. The battery capacity should allow for at least 50,000 five second battery checks. The
battery drain is negligible on all other positions of the range switch
Temperature Operable from -40 °C to 60 °C (-40 °F to 140 °F). For operation below -18 °C (0 °F), alkaline or nickel-cadmium "C" cells should be used.
Temperature Compensation The detector is fully compensated over the operational temperature range for output accuracy within 10% ± 0.5 mR/h.
Moisture Seals used at openings for dust and water resistance. Detector is protected by a silica-gel dryer.
Humidity: Operable from 0 to 95%, non-condensing
Weight Approximately 3.6 pounds (1.63 kg) with alkaline C cells.
Size 201 L x 107 W x 196 H mm (7.9” L x 4.2” W x 7.7” H), including handle.
Testing The RO-20 has been successfully tested to ANSI N42.17A and is CE Certified to European standard EN50082-1 (EN61000-4-2 & EN61000-4-3).
Options 137Cs gamma check source: CS-7A; Carrying strap: ZP11466031