Wide-Lane Gamma–Neutron Vehicle Portal

Gamma–neutron reach for wide lanes, without a convoy of hardware

The PoliGate™ Vehicle G4N4 is a double-sided gamma–neutron radiation portal monitor for Australian ports, borders, rail heads, and industrial gateways. Four 11 L plastic scintillator gamma detectors and four solid-state neutron detectors screen trucks, rail wagons, and containers as they drive through at 8–20 km/h.

Modular hardware (pillar height, lane width, CCTV integration, cabinet placement) and an Ethernet-connected operator workstation as your “companion app” support an end-to-end workflow from commissioning and tuning through to alarm review, incident export, and auditable reporting.

Why Teams Choose PoliGate™ Vehicle G4N4?

• True dual-modality cover: Four 11 L gamma detectors plus four ¹⁰B/ZnS(Ag) neutron detectors: one system for photons, neutrons, and shielded SNM.
• Wide lanes at speed: Up to 6 m × 4.5 m control zone at 8–20 km/h: suits ports, rail, and multi-axle traffic without forcing stops.
• High sensitivity, low noise: MDAs down to ~0.16 MBq of ¹³⁷Cs and 14,000 n/s of ²⁵²Cf at 8 km/h with false-alarm rate <1/1000 passages.
• Built for hard sites: IP65 pillars, −30 to 50 °C and up to 98 % RH at 40 °C: ready for coastal spray, dust and heat.
• Standards-aligned design: IEC 62244 and ANSI N42.35 basis, plus EMC and safety standards: easier conversations with regulators and integrators.

What’s in the Kit?

Four PoliGate™ Vehicle G4N4 gamma detection blocks, four neutron detection blocks, electronics/control cabinet with integrated 12 V backup battery, local light and sound alarms, occupancy sensors, mains power cabling, Ethernet interface, operator workstation software licence, installation guide and user manual (site-specific mounting frames, bollards and CCTV options are scoped per project).

Engage our RPM engineering team to design a PoliGate™ Vehicle G4N4 lane aligned with your threat profile, vehicle mix, and regulatory requirements.

PoliGate™ Vehicle G4N4 Key Specs

Type: Double-sided gamma–neutron radiation portal monitor for vehicles.

Gamma detectors: Plastic scintillator (PVT), ~11 L per detector; 4 gamma detectors total.

Neutron detectors: ¹⁰B/ZnS(Ag) solid-state; 4 neutron detectors; ³He-free design.

Radiation & energy range: Gamma 20 keV – 3 MeV; neutron channel tuned to Cf-252/SNM spectra.

Control zone & speeds: Up to 6 m (W) × 4.5 m (H) at 8–20 km/h; drive-through, no-stop operation.

Typical gamma MDAs (8 km/h, 6 × 4.5 m, background <0.1 µSv/h): ²⁴¹Am ~1.5 MBq; ¹³⁷Cs ~0.16 MBq; ⁶⁰Co ~0.10 MBq; ²³⁸U ~1300 g; ²³⁵U ~80 g; ²³⁹Pu ~2.3 g.

Shielded Pu & neutron MDAs (8 km/h): ²³⁹Pu behind 4 cm Pb ~240 g; ²⁵²Cf ~14,000 n/s.

Typical gamma MDAs (20 km/h): ²⁴¹Am ~2.3 MBq; ¹³⁷Cs ~0.24 MBq; ⁶⁰Co ~0.15 MBq; ²³⁸U ~1900 g; ²³⁵U ~120 g; ²³⁹Pu ~3.4 g.

Shielded Pu & neutron MDAs (20 km/h): ²³⁹Pu behind 4 cm Pb ~400 g; ²⁵²Cf ~24,000 n/s.

Gamma sensitivity (per detector): ~251 cps per nSv/h (²⁴¹Am); 57 cps per nSv/h (¹³⁷Cs); 27 cps per nSv/h (⁶⁰Co).

False alarm rate: <1/1000 passages (under stated conditions).

Power: 110 V AC (90–132 V) or 220 V AC (180–264 V), 47–63 Hz; ≤120 V·A; internal 12 V rechargeable battery with >8 h backup.

Comms: Ethernet from control unit to operator PC / site network.

Environmental: IP65; −30 to 50 °C; 84–106.7 kPa; up to 98 % RH at 40 °C.

Weights: ~120 kg per gamma block; ~130 kg per neutron block; ~20 kg control unit.

Frequently Asked Questions

What radiation does PoliGate™ Vehicle G4N4 detect?

Vehicle G4N4 detects both gamma and neutron radiation. It uses large-volume plastic scintillators for gamma and ¹⁰B/ZnS(Ag) detectors for neutrons, supporting detection of unshielded and shielded SNM and industrial/medical sources.

How rugged is G4N4 for Australian yards and ports?

Detector pillars are IP65-rated and specified from −30 to 50 °C with high humidity tolerance. Combined with lead shielding and industrial cabinet hardware, they’re designed for continuous duty in exposed, dusty, and coastal environments.

What’s the “companion app” for operators?

The system connects over Ethernet to a Windows®-based operator workstation. That software shows live gamma/neutron count-rates, alarms and status, logs events, and can integrate with site CCTV and higher-level security systems.

What standards does Vehicle G4N4 align with?

The PoliGate Vehicle line is designed around IEC 62244:2019 and ANSI N42.35-2016 for RPM performance, and meets common EMC and electrical safety standards. Formal acceptance still depends on local regulator requirements and site-specific testing.

Compliance note: All specifications, MDAs, and standards references are based on manufacturer documentation and may change without notice. Agencies remain responsible for confirming local regulatory acceptance, site licensing, and export-control obligations before procurement, installation, or cross-border transfer.