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Homeland Security

n-Defender series detectors are a new high performing neutron radiation detection product line specifically designed for security monitoring applications, with an emphasis on reliability, accuracy, and ease of use. These include the n-Defender Portal (PTI-110-NDM or PTI-101-NDM), the n-Defender Maritime (PTI-116-NDM), and the n -Defender Vehicle (PTI-119-VMD).The new n-Defender family of detection products represents a leap forward in the nuclear weapons detection market.  Developed for fixed, mobile, and portable radiation detection applications, n-Defender is designed to provide users with the most sensitive nuclear weapons and materials detection capability while at the same time ensuring a cost effective, high reliability product.

Preserving the basic advantages that made the 3He tube the dominant technology in the harsh security environment, n-Defender provides significant advantages over competitive neutron detectors for installations in fixed portal monitoring systems at ports and borders, mobile search systems for land and maritime missions, and portable radiation instruments such as backpacks and handhelds.  All n-Defender products utilize the powerful wire avalanche method of signal generation providing total immunity to temperature extremes, tolerance to harsh handling, and by far the best longevity in the field. Utilizing the patented boron-coated straw (BCS) technology, the n-Defender systems provide a simple and easily-deployed solution that provides users and instrument manufacturers with superior neutron detection with little to no modifications to their existing systems.

The n-Defender family of neutron detectors have been developed to leverage shared manufacturing, materials, and personnel resources.  All n-Defender modules utilize the same basic components, and can be resized quickly to support unlimited large variety of modules and solutions.

Portal DetectorMaritime Detector    Vehicle Mounted Detector


Neutron Science

Proportional Technologies, Inc.'s BCS technology is now offered in conveniently sealed packages that are readily scalable to replace position sensitive 3He tubes in neutron science instruments. Additionally, electronics for high rate & high resolution imaging are also available. Ongoing testing at national laboratories have shown that BCS detectors, like the 7-detector imaging panel pictured below, are equal to the task of replacing 3He detectors with minimal maintenance, reduced cost, and greater versatility.

Neutron imaging panel     Neuron imaging panel nat'l lab testing



Compact Neutron Detectors

PTI is pushing the limits in the size of neutron detection. Unlike 3He detectors, BCS detectors can operate at detector sizes smaller than 0.5" diameter tubes while remaining highly sensitive to thermal neutrons. PTI has developed pocket sized and hand-held personal radiation detectors that can be paired with a cell phone or tablet via Bluetooth for easy readout. PTI continues to advance the BCS technology by introducing the star straw detector - a 1" diameter detector with efficiency equivalent of a 3-atm 3He detector.

Personal radiation detector Star Straw Detector  Hand-held neutron detector   




Our portable Fission Meter and Multiplicity Counter offer solutions for the detection of fission neutron sources contained in illicit radioactive material. PTI also offers a BCS detector with extremely fast die-away times, compatible with active interrogation. Finally, PTI has developed a directional neutron detector, capable of mobile and real-time determination of the direction of a neutron source relative to the detector.


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