IEC 62484-2020 pdf free.Radiation protection instrumentation – Spectrometric radiation portal monitors (SRPMs) used for the detection and identification of illicit trafficking of radioactive material.
The detection zone is the area located adjacent to a single-sided detection assembly or between two or more detection assemblies where the measurement of radiation takes place (Figure 1). The size of the detection zone is based on the classification of use. If a monitor is used in two or more classifications, its detection zone shall be appropriate for each classification. The detection zone shall be of a size that ensures that all objects which could move through the detection zone are monitored. The manufacturer shall state the SRPM classification(s) for which the requirements stated in this document are met.
Operational conditions such as separation distance (distance between opposing detection assemblies), object speed, and background radiation should be considered when installing the monitor.
It Is important to be able to identify the object that caused an alarm. The alarm should be generated within a period of time to ensure that the object that caused an alarm can be identified. This is important if complex algorithms are in place that need a finite process time. It becomes more important if a constant stream of traffic is being monitored (e.g.. pedestrians).
4.1.2 Pedestrian monitor
Pedestrian SRPMs shall provide a detection zone to ensure that people are monitored. Pedestrian SRPMs may use a single detection assembly (single-sided) or multiple directly opposing detection assemblies (two-sided). lithe height is restricted by the SRPM frame, the top testing height of 2 m may be adjusted to allow test sources to pass through the detection zone.
4.1.3 Road vehicle monitor
Road vehicle monitors are divided into two types, large and small. Small road vehicle SRPMs typically monitor vehicles that are  2,5 m high. Large road vehicle SRPMs typically monitor vehicles that are typically > 2,5 m high. Both types shall be two-sided.
4.1.4 Rail vehicle monitor (includes rail transported containers)
Rail vehicle SRPMs shall be two-sided. Rail vehicle SRPMs should have the ability to identify an individual railcar that caused an alarm while monitoring an entire multi-car train.
4.1.5 Package (or conveyor) monitor
Package or conveyor SRPMs shall provide a detection zone to ensure that items moving through the detection zone are monitored. Package or conveyor SRPMs may use a single detection assembly or multiple detection assemblies with detectors across the top, bottom, and/or side(s) of the detection zone. The detection zone is located adjacent to a detection assembly for single sided conveyor SRPMs. For multiple detector conveyor SRPMs, the detection zone is located between the detection assemblies.
4.2 Physical configuration
SRPMs may be designed for use in weather controlled or non-controlled environments. The detection assemblies for road and rail vehicle monitoring may be subjected to vibration from the passing of heavy vehicles. Mounting techniques (I.e.. concrete pads) that are not addressed by this document shall be designed to minimize the transfer of vibration and shock conditions to the detection assemblies.
Controls and adjustments which affect calibration and alarm settings shall be designed to ensure access to them is limited to authorised persons.
Provisions shall be made to permit testing of visual and/or audible warning indicators without the use of radiation sources.IEC 62484 pdf download.