Mirion RDS-31 Radiation Survey Meter with ABP-150 Alpha/Beta Probe
The Mirion RDS-31 is a compact, battery-powered radiation survey meter designed for portable gamma and X-ray monitoring. When connected to the ABP-150 external alpha/beta probe, it can also support surface-contamination surveys and pulse-counting applications. This combination is relevant for radiation-protection teams, nuclear facilities, laboratories, hospitals, industrial inspection groups, emergency-response organizations, research institutes, and maintenance departments that need one handheld platform for several survey tasks.
The RDS-31 uses an internal GM detector for ambient dose-equivalent and dose-rate measurements. According to the manufacturer documentation, the internal detector responds to gamma and X-ray radiation over an energy range of 48 keV to 3 MeV. The specified dose-rate range is 0.01 µSv/h to 0.1 Sv/h, while the accumulated-dose range is 0.01 µSv to 10 Sv. The selected RDS-31 version determines whether the primary engineering units are based on sieverts or rem.
Using the ABP-150 external probe
The ABP-150 is identified in the RDS-31 documentation as an alpha/beta probe with order number 1233-289 and a stated count-rate range of 0 to 100,000 cps. Its larger 100 cm² detection area supports efficient scanning of work surfaces, protective clothing, tools, benches, containers, and other locations where removable or fixed alpha/beta contamination may need to be checked. The probe is used as an external pulse-mode detector, so the RDS-31 display can be configured for units such as cps, cpm, dpm, Bq, or Bq/cm², depending on the instrument setup and measurement procedure.
Connection of an external detector does not remove the need to understand the instrument configuration. Probe identity, cable and connector condition, calibration factors, alarm thresholds, unit selection, firmware, and response checks all influence the quality of the final survey. Buyers replacing an existing set should compare the complete meter version, probe order number, connector type, software configuration, and supplied accessories rather than ordering by the family name alone.
| Verification point | Information for this product page |
|---|---|
| Meter family | Mirion RDS-31 portable radiation survey meter |
| Internal measurement | Gamma and X-ray ambient dose equivalent and dose rate |
| Internal energy range | 48 keV to 3 MeV, according to the RDS-31 user manual |
| Dose-rate range | 0.01 µSv/h to 0.1 Sv/h with the internal detector |
| External probe | ABP-150 alpha/beta probe, order number 1233-289 |
| ABP-150 count-rate range | 0 to 100,000 cps |
| Detection area | 100 cm² |
| Buyer action | Confirm meter version, firmware, cable, connector, calibration, accessories and complete scope of supply |
Survey planning and measurement quality
For contamination monitoring, define the radionuclides of interest, expected alpha and beta emissions, background level, surface geometry, required detection limit, survey speed, and applicable operating procedure before selecting the instrument configuration. Alpha measurements are particularly sensitive to distance, window condition, dirt, moisture, and protective coverings. The detector should be moved close to the surface without contacting or damaging the window, and the scan speed must allow enough counting time to identify a meaningful increase above background.
Record a background reading in a suitable clean area before beginning the survey. Verify instrument response with an approved check source and confirm that the audible, visual, or vibration alarms behave as required by the site procedure. During scanning, keep the probe orientation and distance consistent. Unexpected readings should be repeated from more than one direction and evaluated against the survey plan rather than interpreted from a single short observation.
Configuration and data review
The RDS-31 menu and CSW-31 configuration software can be used to manage operational parameters, alarm settings, external-detector functions, and histogram features. A controlled configuration is important when several instruments are used across one facility. Units, alarm thresholds, averaging behavior, data-storage settings, and user access should be documented so that readings from different teams remain comparable.
When an external detector is connected, the meter can present information from the external probe while the internal detector remains available for worker dose-rate awareness. Before relying on dual-display operation, confirm the installed firmware and configuration, then test the complete assembly under the organization’s radiation-protection procedure. Stored measurements and survey records should identify the meter serial number, probe serial number, calibration status, background, units, location, operator, and date.
Maintenance and purchasing checks
Inspect the enclosure, display, battery compartment, probe cable, connector pins, strain relief, and detector window before use. Replace batteries according to the manual and follow the required contamination-control process before moving equipment between controlled and clean areas. Calibration intervals, functional checks, cleaning methods, storage conditions, and repair decisions should be governed by the facility’s quality program and local regulations.
For a replacement or project purchase, confirm whether the required scope includes the RDS-31 meter, ABP-150 probe, connecting cable, batteries, carrying case, configuration link, software, documentation, and calibration certificates. The image is provided as a product reference; final identification should be based on the model labels, order numbers, serial numbers, calibration documents, and confirmed scope of supply.
