Key Takeaways — Portal Monitoring at a Glance
Before diving into the details, here is a high-level summary of what radiation portal monitoring involves and what solutions are available.
Portal monitoring refers to stationary detection systems that screen people, vehicles, cargo, or waste streams for the presence of radioactive materials. These systems range from compact pedestrian monitors to large-scale spectroscopic portals capable of identifying specific radionuclides in real time.
Canberra Packard offers three distinct solution tiers to address different operational needs:
| Portal Monitoring Solutions at a Glance | |||
|---|---|---|---|
| Solution | Type | Best For | Detection Capability |
| SPIR-Ident™ Portals | High-End / Spectroscopic (SRPM) | Border security, customs, critical infrastructure | Real-time radionuclide identification |
| GammaEntry Evolution | Mid-Range / Flexible | Scrap yards, industrial sites, logistics | Reliable gamma detection with optional spectrometry |
| Mini Portal Systems | Entry-Level / Compact | Pedestrian screening, waste monitoring | Automatic gamma detection in confined spaces |
Whether the priority is maximum threat identification accuracy or cost-efficient screening at scale — there is a matching solution for every requirement and budget.
What Is Portal Monitoring?
Portal monitoring is the process of using fixed, gate-like detector systems to screen objects or persons passing through a defined area for the presence of ionising radiation. The detectors are typically arranged in columns or panels on either side of a passage — forming a “portal” that vehicles, pedestrians, or goods must pass through.
These systems operate continuously and automatically. When an object enters the detection zone, the system switches from background measurement to active screening. If the measured radiation exceeds a dynamically calculated threshold, an alarm is triggered.
There are two fundamental approaches in portal monitoring technology:
Gross-count detection measures overall radiation levels. If the count rate exceeds the expected background, an alarm is raised. This method is reliable and cost-effective but cannot determine what type of radioactive material caused the alarm.
Spectroscopic detection (SRPM) goes further. In addition to detecting elevated radiation, these systems analyse the energy spectrum in real time and identify the specific radionuclide responsible. This allows operators to distinguish between harmless sources — such as naturally occurring radioactive material (NORM) or medical isotopes — and genuinely threatening materials.
This distinction is central to understanding the different solution categories described on this page.
“We don’t just detect radiation — we identify it. That’s what sets modern portal monitoring apart.”
Canberra Packard Central Europe
Applications of Radiation Portal Monitors
Portal monitoring systems are deployed across a wide range of sectors. The common factor is always the same: preventing radioactive materials from passing undetected through a controlled checkpoint.
Border Security and Customs
At international borders, ports, and airports, radiation portal monitors screen incoming and outgoing cargo, vehicles, and passengers. The goal is to detect illicit trafficking of radioactive or nuclear materials, including components that could be used in radiological dispersal devices (so-called “dirty bombs”). Spectroscopic systems like SPIR-Ident™ are particularly valuable here because they reduce false alarms caused by legitimate radioactive sources such as medical shipments or ceramic goods containing NORM.
Scrap Metal and Recycling Industry
One of the most widespread applications of portal monitors is at scrap yards and recycling facilities. Orphan radioactive sources — devices containing radioactive material that have been lost, stolen, or improperly discarded — occasionally end up in scrap metal streams. If undetected, these sources can contaminate entire batches of recycled material, damage processing equipment, and pose serious health risks. GammaEntry Evolution systems are particularly well suited for this application due to their robust design and cost-performance balance.
Nuclear and Industrial Facilities
At nuclear power plants, fuel processing facilities, and other installations handling radioactive materials, portal monitors are used to screen personnel, vehicles, and equipment leaving controlled zones. The objective is to ensure that no contaminated objects or materials leave the facility without authorisation.
Hospitals and Medical Institutions
Hospitals that perform nuclear medicine procedures — such as diagnostic imaging or cancer therapy — produce radioactive waste that must be carefully managed. Mini Portal Systems are commonly used at hospital waste exits to verify that only properly categorised waste leaves the controlled area.
Logistics and Warehousing
Large logistics hubs and distribution centres may use portal monitors as a general safety measure, particularly when handling goods from regions where radioactive contamination is a known concern. Screening incoming shipments protects workers, facilities, and downstream customers.
Our Portal Monitoring Solutions
Canberra Packard offers a complete range of radiation portal monitoring systems — from advanced spectroscopic identification portals to compact, entry-level monitors. Each system is designed for specific operational requirements, and all solutions are backed by decades of expertise in radiation detection technology.
SPIR-Ident™ — Spectroscopic Radiation Portal Monitors
Detect. Identify. Decide.
SPIR-Ident™ represents the most advanced tier of portal monitoring technology. Unlike conventional portal monitors that only detect elevated radiation levels, SPIR-Ident™ performs real-time radionuclide identification — a capability known as Detection-by-Identification.
This means operators receive not just an alarm, but actionable information about what type of radiation source triggered it. The result: fewer nuisance alarms, faster decision-making, and significantly improved operational efficiency.
Key capabilities:
- Real-time radionuclide identification during passage
- Alarms only for sources of actual interest — not for NORM or medical isotopes
- Available in gamma-only and gamma-neutron configurations
- Modular and scalable architecture for permanent or temporary deployment
- Central alarm station integration with alarm replay and video support
- Network-capable for large-scale, multi-portal installations
- Compliant with IAEA, IEC, and ANSI standards
| Available configurations: | ||
|---|---|---|
| Variant | Description | Typical Use |
| Pedestrian Portal | Screening of individuals and hand-carried items in high-traffic zones | Airports, government buildings, events |
| Modular Portal | Flexible integration into walls, poles, or existing portal frames | Vehicles, cargo, trains, customs checkpoints |
SPIR-Ident™ is the preferred choice for high-security environments where accurate threat identification — not just detection — is essential.
GammaEntry Evolution — Flexible and Cost-Efficient Portal Monitoring
For many industrial and commercial applications, full spectroscopic identification is not required. What matters is reliable, robust, and affordable radiation screening — and that is exactly what GammaEntry Evolution delivers.
This system is designed for organisations that need dependable portal monitoring without unnecessary complexity or cost. It is particularly effective in environments where vehicles, scrap loads, or waste containers need to be screened at moderate throughput.
Key capabilities:
- Dynamic measurement for vehicles in motion and static measurement for stationary inspection
- Continuous background monitoring with automatic threshold adjustment
- Simple, intuitive software interface with measurement history
- Automated system diagnostics and quality control
- Detector options: 12-litre or 25-litre plastic scintillators
- Optional features: cameras, traffic lights, single-sided configuration
SpectraGate Software — optional upgrade:
GammaEntry Evolution can be enhanced with SpectraGate, an advanced yet practical analysis software that adds:
- Basic spectrometric analysis capability
- Discrimination between natural and artificial radiation
- Differentiation between low-energy and high-energy gamma radiation
- Continuous background comparison for anomaly detection
This makes GammaEntry Evolution a highly versatile mid-range solution that can be tailored to a wide variety of use cases.
Typical applications:
- Scrap and waste monitoring at recycling plants
- Hospital radioactive waste control
- Radiation screening at industrial sites
- Logistics and vehicle checkpoint screening
Mini Portal Systems — Compact Monitoring for Controlled Environments
Mini Portal Systems provide an entry-level solution for facilities that require automatic radiation monitoring in a compact form factor. These systems are ideal where space is limited or where the primary screening targets are pedestrians and small waste containers.
Key capabilities:
- Dual plastic detectors with lead shielding for optimised sensitivity
- Fully automatic operation — both static and dynamic measurement modes
- Configurable alarm thresholds
- Local and remote display options
- Measurement history database for documentation and audit trails
Typical applications:
- Pedestrian screening in controlled areas (e.g., nuclear facility exits)
- Monitoring of carts and containers with radioactive waste
- Small-scale installations where space constraints apply
Mini Portal Systems are the right choice when reliable automated screening is needed without the footprint or cost of a full-scale portal installation.
How to Choose the Right Portal Monitor
Selecting the appropriate portal monitoring system depends on several factors. The following overview helps identify which solution category aligns with specific operational requirements.
| Portal Monitor Comparison | |||
|---|---|---|---|
| Feature | SPIR-Ident™ | GammaEntry Evolution | Mini Portal |
| Detection method | Spectroscopic (SRPM) | Gross-count (+ SpectraGate option) | Gross-count |
| Nuclide identification | Yes, real-time | Basic (with SpectraGate) | No |
| Gamma detection | Yes | Yes | Yes |
| Neutron detection | Optional | No | No |
| Screening targets | Pedestrians, vehicles, cargo, trains | Vehicles, waste, cargo | Pedestrians, small containers |
| Detector options | Modular configuration | 12 L / 25 L plastic scintillators | Dual plastic with lead shielding |
| NORM filtering | Yes | Limited | No |
| Software | Central alarm station | SpectraGate (optional) | Basic with measurement history |
| Video integration | Yes | Optional (cameras) | No |
| Network capable | Yes (multi-portal) | No | Local + remote display |
| Standards compliance | IAEA, IEC, ANSI | Industry standard | Industry standard |
| Installation type | Permanent or temporary | Flexible | Compact / fixed |
| Budget range | Premium | Mid-range | Entry-level |
For complex or high-security applications, SPIR-Ident™ is the clear recommendation. For cost-sensitive industrial monitoring, GammaEntry Evolution offers the best balance of performance and economy. For compact, space-constrained environments, Mini Portal Systems provide a reliable and affordable solution.
Why Choose Canberra Packard
Canberra Packard Central Europe has been a trusted name in radiation detection and measurement since 1987. With more than 80 employees operating from 10 offices across Central and Eastern Europe, the company offers a level of regional presence and hands-on expertise that few competitors can match.
What sets Canberra Packard apart:
- Deep expertise in radiation detection technologies spanning nearly four decades
- A comprehensive portal monitoring portfolio — from entry-level to spectroscopic high-end
- Proven reliability in some of the most demanding environments worldwide, including nuclear power plants, government institutions, and international organisations such as the European Commission and the World Health Organization
- Local teams with regulatory knowledge, technical skill, and a strong customer-first approach
- End-to-end support: consulting, system design, installation, commissioning, training, and long-term maintenance
Choosing Canberra Packard means choosing a partner — not just a supplier.