June 17, 2019 | International, Other Defence
X-rays and gamma rays have a wide range of applications including scanning suspicious maritime shipping containers for illicit materials, industrial inspection of materials and processes, and medical diagnostic and therapeutic procedures. Current technologies, however, are not ideal. X-rays produce a continuum of energies that limit their inspection and diagnostic performance, and gamma rays can only be produced at specific energies unique to a given radioactive isotope.
DARPA today announced its Gamma Ray Inspection Technology (GRIT) program. GRIT seeks novel approaches to achieve high-intensity, tunable, and narrow-bandwidth sources of gamma ray radiation in a compact, transportable form factor that would enable a wide range of national security, industrial, and medical applications. A Proposers Day webinar describing the goals of the program is scheduled for July 8, 2019.
“What we're trying to do in GRIT is transform the use of x-rays and gamma rays,” said Mark Wrobel, program manager in DARPA's Defense Sciences Office. “Current sources of gamma rays, like Cobalt-60 or Cesium-137, are not very flexible. They require special licenses to possess and only emit gamma rays at very specific energies. What we desire is a source of very high-energy photons that we can tune to match the application we need. This ranges from more effective detection of illicit cargo, to a more informative medical x-ray.”
GRIT aims to provide a source of tunable, pure x-rays and gamma rays from tens of keV (kilo-electron volts) up through over ten MeV (mega-electron volts). Currently, tunable and narrow bandwidth gamma ray sources only exist at highly specialized user facilities best suited for basic research and are not able to support broad practical applications. Shrinking these photon sources to a transportable system is a major goal and challenge of the GRIT program.
GRIT technology could make possible a range of new inspection and diagnostic protocols. In medical and industrial radiography, for example, GRIT could enable revealing specific elemental and material content, such as calcium in bones or specific metals in cargo. A typical x-ray only shows differences in density in the object being inspected – whether a piece of luggage at an airport, or an individual at a doctor's office. If successful, a GRIT x-ray source could be tuned to detect and quantify the concentration of specific elements of interest, such as the amount of calcium in a given bone x-ray, enabling radiologists to actually see bone composition.
Tuning energy between 10s of keV to over 100 hundred keV would allow detection of specific elements that might be of interest in characterizing novel materials and processes at micron scales. These techniques would be relevant to defense applications including non-destruction inspection of novel additively manufactured materials and alloys for their elemental composition.
At energy levels in the MeV range, gamma ray photons have high enough energy to actually interact with the nuclei of atoms. Whereas x-rays work by interacting with the shells of atoms, GRIT would be able to stimulate the nucleus of an atom to bring about an effect called nuclear resonance fluorescence, a sort of “fingerprint” that is unique to each isotope on the periodic table.
“With GRIT, you could probe and detect specific isotopes of interest by fine-tuning the photon energy to minimize background noise and take advantage of the nuclear resonance fluorescence phenomenon,” Wrobel said. “Those isotopes could be rare-earth elements of interest or special nuclear materials. To be able to definitively say, ‘Yes, there's highly enriched uranium in this object' and be able to characterize how much is present would be a significant leap forward over our current capabilities.”
DARPA is seeking expertise in a range of technologies on the GRIT program including advanced accelerator technology, high-energy laser systems, novel control systems, and new x-ray and gamma ray detector technology. To register for the GRIT Proposers Day webinar, visit: https://go.usa.gov/xmh28.
GRIT's focus on new, compact photon sources for inspection complements DARPA's Intense and Compact Neutron Sources (ICONS) program, which is developing compact neutron sources. The two technologies would work in tandem, yielding a very robust inspection capability.
Caption: The Gamma Ray Inspection Technology (GRIT) program seeks tunable gamma ray sources for a host of national security, industrial, and medical applications.
July 20, 2023 | International, Aerospace
Reliable Robotics, a Silicon Valley startup aiming to automate conventional fixed-wing planes, has received approval from the Federal Aviation Administration to proceed with its plan to test and certify fully automated aircraft systems, the company said on Thursday.
October 25, 2019 | International, Aerospace
By: Sebastian Sprenger COLOGNE, Germany — A European consortium has pitched the idea of grooming intelligent drone swarms to confuse, disable and destroy enemy air defenses. The proposal is part of the Preparatory Action on Defence Research effort by the European Union to improve collaboration on among member states. Under the heading “Emerging Game Changers,” EU officials asked companies earlier this year to submit ideas for “promising breakthrough technologies” in the field of artificial intelligence for defense applications. The idea behind “SEAD Swarm” is to create the necessary algorithms that would enable a mass of aerial drones to inspect the characteristics of air defense systems, distribute the information within the swarm and derive a plan of attack against weak points. Actions taken could include blinding radar sensors, overwhelming anti-aircraft fire with kamikaze-type tactics, or attacking sites with explosive or electronic-warfare payloads. The acronym SEAD is short for “suppression of enemy air defenses,” military platforms that often expose pilots of manned aircraft to significant risk of getting shot down. The proposed project comes in the wake of Finland designating advances in AI a key objective for its six-month term leading the Council of the European Union. The idea is backed by a consortium of 12 private companies, national research institutions and universities from six countries, with Finnish company Insta as the lead. A decision from European decision-makers on the award of an approximately $2 million grant to start the project is expected in the next few months. Consortium officials stress that nothing would be built during the initial phase of the project. Instead, the idea is to incubate the necessary “swarm logic” and learning algorithms in a simulation environment, where scenarios can be gamed out and quickly adapted, Ari Kosonen, a senior systems engineer at Insta, told Defense News. Letting the drone swarm and air defense systems battle it out in a controlled cyberspace environment would yield patterns of problem-solving that can continuously improve both the attackers' and the defenders' performance, Kosonen said. In addition, thinking through the idea on a purely theoretical level would allow proper consideration for ethical and legal questions that arise whenever AI is weaponized, he added. If adopted by the EU, the participating countries of Finland, Germany, Slovenia, Estonia, the Netherlands and Austria would detail military officials to an advisory board to help ensure the planned simulations reflect real-world combat situations. That includes resisting the urge of crafting scenarios that are too clear-cut in allowing judgments about when to apply force and when to stand down, said Christian Brandlhuber, a senior adviser at consortium member Reply AG in Munich. “Does this work in an environment where our situational awareness is less than perfect?” Therein lies the novelty of the SEAD Swarm idea, Brandlhuber argued: Working through the rules of engagement first, only later considering requirements and finally establish concrete acquisition plans could help bring AI-enabled military technology into the EU-wide defense conversation. “There were heated discussions in the consortium about how pronounced the legal and ethical side should be,” Brandlhuber said. Dicey situations could arise, for example, when drones are cut off from communicating with human decision-makers in the final phase of an attack, while the prerequisite is to have a person in the loop for pulling the trigger. “There is a lot of uncertainty in this,” Brandlhuber said, though he argued analysts should strive to understand the complexity that comes with combining drones and AI in a military context. “You can't determine any of this a-priori.” Notably, the consortium includes sensor and hardware manufacturers, like Diehl Defence of Germany and Milrem of Estonia, that could be tapped to build prototypes if the SEAD Swarm project is selected to go forward. https://www.defensenews.com/global/europe/2019/10/22/europeans-propose-siccing-self-learning-drone-swarms-on-air-defenses/
May 2, 2022 | International, C4ISR
'When we think about today's environment, it's less about the traditional arms race of the past, and it's more about the technology race of today and the future.'