VeriFinder S300 (Backpack Radiation Detector), Symetrica's VeriFinder Backpack, puts a spectroscopic gamma detector and an optional 3He-free neutron detector on the operator's back. Walk the area hands-free, get an instant response to sources, and identify multiple and masked isotopes from a smartphone, with GPS and smart wireless reporting built in.

Symetrica describes a rugged, water resistant and reliable system for radiation detection and identification, built on its patented and field-proven Discovery Technology® and designed for specialist missions. The detectors ride in the pack and the interface is an Android smartphone, so the operator's hands stay free for the search.
A backpack turns a venue sweep into a walk. The pack responds to sources as the operator moves, identifies what it finds and, with GPS with GLONASS positioning on board, gives the search a location reference.
Cold start time is 60 s. The interface is simple and intuitive with automatic background optimization, which keeps the training burden low. Symetrica states the unit can switch on and operate in high radiation fields.
Instant response to sources (0.2 s) with continuous operation through temperature shock. Audio, tactile (vibration) & display alerts.
High certainty simultaneous ID of multiple and masked isotopes with low false alarm rate, from 47 isotopes in a customizable library. Sampling time is user settable from 30 s to 120 mins.
GPS with GLONASS on board. Email instant and automatically generated PDF reports. Optional: real-time dose mapping and unit tracking at reach-back.
Symetrica states its advanced algorithms increase the effective resolution of the gamma detection system, resulting in reliable low-level detection with fast, simultaneous and accurate identification of multiple and masked isotopes in challenging real-world environments.
Symetrica's claims: Discovery Technology® combines Symetrica's hardware and patented algorithms, uses on-board processing for spectral enhancement, and is deployed in thousands of systems globally from handheld RIIDs to fixed infrastructure Radiation Portal Monitors (RPM). † Discovery Technology outperforms other systems with the same scintillator by increasing the effective resolution during identification.
The modular gamma and/or neutron detectors can be easily removed from the backpack and mounted for a wide range of alternative applications, so the same detectors can also serve static or mobile deployments.
GammaNeutron · optional
Energy range (gamma) 25 keV to 3 MeV. Scintillator dose rate range 10 nSv/h to 1 mSv/h (1 μR/h to 100 mR/h) with automatic scintillator shutdown protection.
The optional neutron detector technology is 3He-free, employing 6Li:ZnS neutron blade technology that Symetrica says achieves class-leading sensitivity for its size and weight.
Hands-free search on foot, with the detectors carried in the pack and the smartphone as the interface.
Detectors removed from the backpack and mounted for static monitoring.
Detectors removed from the backpack and mounted for mobile operations.

Compatible with commercially available mobile devices. The user interface is an Android smartphone, and the wireless remote control and compatibility with commercial mobile devices maximizes flexibility for configuring custom deployments. An optional forearm / chest mountable smartphone case is also available (pictured); ask us about it when you request a quote.
Extensive reach-back capabilities support remote, real-time monitoring and control of in-the-field devices including real-time events lists, dose mapping and remote diagnostics.
Detectors with on-board processing for spectral enhancement, plus continuous and automatic end-to-end digital stabilization and health monitoring.
Android smartphone interface with audio, tactile (vibration) & display alerts, isotope identification, dose rate meter and GPS with GLONASS.
Instant online reporting with emailed PDF reports. Optional: real-time dose mapping and unit tracking at reach-back.
Web browser interface with fully featured event viewer. Bulk event offload tool. Optional: collated fleet event list with remote view and/or operation of in-the-field devices.
| Configuration | |
|---|---|
| Detectors | 3x3 in (76.2x76.2 mm) NaI crystal with Discovery Technology† 6Li:ZnS 3He-free neutron blade system The neutron detector is optional; the modular detectors are gamma and/or neutron. |
| Functions | Isotope detection and identification, neutron detection, spectral analysis, dose rate meter, instant online reporting |
| Cold start time | 60 s |
| Identification & gamma | |
|---|---|
| Identifications | ANSI N42.53 |
| Energy range (gamma) | 25 keV to 3 MeV |
| Raw resolution | 7.5% FWHM at 662 keV (137Cs) |
| Effective resolution† | 1.6% FWHM at 662 keV (137Cs) |
| Library | 47 isotopes in a customizable library |
| Dose rate | |
| Dose rate range | 10 nSv/h to 900 mSv/h (1 μR/h to 90 R/h) 137Cs |
| Scintillator dose rate range | 10 nSv/h to 1 mSv/h (1 μR/h to 100 mR/h) with automatic scintillator shutdown protection |
| High dose rate mode | 0.9 mSv/h to 900 mSv/h (90 mR/h to 90 R/h) 137Cs |
| Neutron (optional detector) | |
| Neutron (optional detector) | 252Cf 20,000 n/s @ 1.2 m/s @ 1.5 m (4 ft/s @ 5 ft) Moderated or unmoderated |
| Operation | |
| Sampling time | User settable from 30 s to 120 mins |
| Response time | Instant response to sources (0.2 s) with continuous operation through temperature shock |
| Stabilization & health monitoring | Automatic and continuous end-to-end digital calibration [±0.5% at 662 keV], stabilization and health monitoring |
| Maintenance | 5-year calibration and service interval; no annual calibration required |
| Power | |
|---|---|
| Power | 110-240 V mains and external fast battery charger |
| Battery type | COTS rechargeable Li-ion |
| Position, data & interface | |
| Positioning & mapping | GPS with GLONASS Optional: Real-time dose mapping and unit tracking at reach-back |
| Data & connectivity | PDF reports, ANSI N42.42 compliant |
| User interface | Android Smartphone Optional: Forearm / chest mountable smartphone case |
| PC interface | Web browser interface with fully featured event viewer. Bulk event offload tool Optional: Collated fleet event list with remote view and/or operation of in-the-field devices |
| Alerts | Audio, tactile (vibration) & display alerts |
| Environmental | |
|---|---|
| Operating temperature | -20°C to 50°C (-4°F to 122°F) |
| Relative humidity | Up to 93% relative humidity, non-condensing, 40°C (104°F) |
| Ingress protection | IP54 Optional: IP67 as per IEC 60529 |
† Symetrica: "Discovery Technology outperforms other systems with the same scintillator by increasing the effective resolution during identification."
Two-page product datasheet.
PDF · Symetrica ServiceOEM-certified service and support on every product we deliver. When a repair or calibration falls outside our in-house scope, we coordinate directly with the third-party manufacturer and manage the logistics end to end.
Learn moreSymetrica's handheld VeriFinder models, also on farrwest.com.
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