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Thermo Scientific™
RO-20 Ion Chamber Survey Meters
Catalog number: RO20AA
Have Questions? 
Thermo Scientific™
RO-20 Ion Chamber Survey Meters
Catalog number: RO20AA
Have Questions? 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.
| Certifications/Compliance | Successfully tested to ANSI™ N42.17A. CE Certified to European standard EN50082-1 (EN61000-4-2 and EN61000-4-3) |
| Description | RO20AA |
| Dimensions (L x W x H) | 7.9 x 4.2 x 7.7 in. (201 x 1047 x 196 mm) |
| Energy Range | Photon Response: ± 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 |
| Battery Type | 5“C” cells |
| Product Type | Survey Meter |
| Measurement Range | Linear Ranges: 0 to 5, 0 to 50; 0 to 500 mR/h; (0 to 5; 0 to 50R/h) |
| Operating Temperature (Metric) | −40°C to 60°C |
| Height (English) | 7.7 in. |
| Length (English) | 7.9 in. |
| Operating Temperature (English) | -104°F to 140°F |
| Response Time | 90% of final reading within 5 seconds |
| Detector Type | Beta, Gamma, X-Ray |
| Linearity | Within 5% of Full Scale |
| Width (Metric) | 10.47 cm |
| Weight (Metric) | 1.63 kg |
| Humidity | 0% to 95% |
| Internal Controls | five calibration controls, one for each range |
| Voltage | 30 V |
| Battery Dependence | Reading is independent of battery voltage when the battery check indication is in the green arc |
| Chamber Bias | Ten 3V lithium coin cells, 30 V |
| Radiation Type | Beta, Gamma, X-Ray |
| External Control | 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 |
| Width (English) | 4.2 in. |
| Battery Life | 150 to 6900 hr. |
| Weight (English) | 3.6 lb. |
| Length (Metric) | 201 mm |
| Height (Metric) | 19.6 cm |
| Unit Size | Each |
| Certifications/Compliance | Successfully tested to ANSI™ N42.17A. CE Certified to European standard EN50082-1 (EN61000-4-2 and EN61000-4-3) |
| Description | RO20 |
| Dimensions (L x W x H) | 7.9 x 4.2 x 7.7 in. (201 x 1047 x 196 mm) |
| Energy Range | Photon Response: ± 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 |
| Battery Type | 5“C” cells |
| Product Type | Survey Meter |
| Measurement Range | Linear Ranges: 0 to 5, 0 to 50; 0 to 500 mR/h; (0 to 5; 0 to 50R/h) |
| Operating Temperature (Metric) | −40°C to 60°C |
| Height (English) | 7.7 in. |
| Length (English) | 7.9 in. |
| Operating Temperature (English) | -104°F to 140°F |
| Response Time | 90% of final reading within 5 seconds |
| Detector Type | Beta, Gamma, X-Ray |
| Linearity | Within 5% of Full Scale |
| Width (Metric) | 10.47 cm |
| Weight (Metric) | 1.63 kg |
| Humidity | 0% to 95% |
| Internal Controls | five calibration controls, one for each range |
| Voltage | 30 V |
| Battery Dependence | Reading is independent of battery voltage when the battery check indication is in the green arc |
| Chamber Bias | Ten 3V lithium coin cells, 30 V |
| Radiation Type | Beta, Gamma, X-Ray |
| External Control | 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 |
| Width (English) | 4.2 in. |
| Battery Life | 150 to 6900 hr. |
| Weight (English) | 3.6 lb. |
| Length (Metric) | 201 mm |
| Height (Metric) | 19.6 cm |
| Unit Size | Each |
| Certifications/Compliance | Successfully tested to ANSI™ N42.17A. CE Certified to European standard EN50082-1 (EN61000-4-2 and EN61000-4-3) |
| Description | RO20SI |
| Dimensions (L x W x H) | 7.9 x 4.2 x 7.7 in. (201 x 1047 x 196 mm) |
| Energy Range | Photon Response: ± 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 |
| Battery Type | 5“C” cells |
| Product Type | Survey Meter |
| Measurement Range | Linear Ranges: 0 to 5, 0 to 50; 0 to 500 mR/h; (0 to 5; 0 to 50R/h) |
| Operating Temperature (Metric) | −40°C to 60°C |
| Height (English) | 7.7 in. |
| Length (English) | 7.9 in. |
| Operating Temperature (English) | -104°F to 140°F |
| Response Time | 90% of final reading within 5 seconds |
| Detector Type | Beta, Gamma, X-Ray |
| Linearity | Within 5% of Full Scale |
| Width (Metric) | 10.47 cm |
| Weight (Metric) | 1.63 kg |
| Humidity | 0% to 95% |
| Internal Controls | five calibration controls, one for each range |
| Voltage | 30 V |
| Battery Dependence | Reading is independent of battery voltage when the battery check indication is in the green arc |
| Chamber Bias | Ten 3V lithium coin cells, 30 V |
| Radiation Type | Beta, Gamma, X-Ray |
| External Control | 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 |
| Width (English) | 4.2 in. |
| Battery Life | 150 to 6900 hr. |
| Weight (English) | 3.6 lb. |
| Length (Metric) | 201 mm |
| Height (Metric) | 19.6 cm |
| Unit Size | Each |
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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)
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