CVT Associate, recent graduate Dr. Michael Hamel demonstrates 2-D visualization of gamma ray imaging at the University of Michigan’s Nuclear Engineering Laboratory. Two sources (hotspots) are shown in the image below. The instrument used to acquire these images is the Dual Particle Imager (image, bottom), developed by the DNNG group at the University of Michigan (led by Prof. Sara Pozzi). The imager is also capable of fast neutron imaging and energy spectroscopy.

Scientists, Igor Jovanovic and Kyle C. Hartig, are recognized in Scientific Reports for their work titled “Two-dimensional fluorescence spectroscopy of uranium isotopes in femtosecond laser ablation plumes”!

Read more here

Professor Sara Pozzi, CVT Director, was elected Fellow of the American Nuclear Society!

Professor Sara Pozzi was elected Fellow of the American Nuclear Society. The election to the rank of Fellow within the Society recognizes the contributions made to the advancement of nuclear science and technology through the years. It is the Society’s highest membership grade, to which a select group of professional associates have been elected. The selection comes as a result of nomination by peers, careful review by the Honors and Awards Committee, and election by the Society’s Board of Directors. Congratulations!

View Prof. Pozzi’s bio here. 

CVT leadership visits Defense Nuclear Nonproliferation’s Nonproliferation Research and Development (DNN R&D) team in Washington, DC

Above (left to right): Dr. Shaun Clarke (U. Michigan), Dr. Michael Cai (DNN R&D), and Prof. Sara Pozzi (U Michigan)

The CVT leadership took an opportunity to visit with DNN R&D sponsor representatives in Washington DC this spring. CVT progress was highlighted during this visit producing great feedback and collaboration. Explore our site to learn more about the CVT mission, personnel, and activities!

CVT researchers show that lasers can detect weapons-grade uranium from afar

Professor Igor Jovanovic, University of Michigan, (photo right) and Kyle Hartig (photo left), former CVT fellow, have shown that a technique often used to identify chemicals at a distance can also distinguish between ordinary uranium-238 and the fission-prone uranium-235. You can read the full article here at the Michigan News website.

The publication can be found on Nature publications here: http://www.nature.com/articles/srep43852


CVT students are recognized for their excellence!

Crystal Green (left) receives the Distinguished Leadership Award and Ciara Sivels (right) is honored with the Marian Sarah Parker Prize. Both students are Ph. D. candidates at the University of Michigan.

CVT students participate in an experimental campaign at ORNL

 ORNL Camaign-2017b

Three University of Michigan Ph.D. candidates (from left to right: Marc Ruch, Mark Norsworthy, Michael Hamel) traveled to Oak Ridge National Laboratory (ORNL) in January 2017 for a 3-day experimental campaign.  Dr. Paul Hausladen of the Nuclear Material Detection and Characterization Group hosted the students as they measured the response of EJ-309 liquid scintillator detectors to fast neutrons from an associated-particle D-T neutron generator.  The experiment was designed to isolate pulses created by neutrons scattering on carbon nuclei in the scintillator, building on previous work at ORNL conducted in the 1960s.

University of Michigan undergrads! Take advantage of this opportunity to learn from top research scientist in the field of nuclear nonproliferation and detection. Learn more about this fellowship opportunity here!2017-web-flier-undergradfellow

Click here to learn more about our 2017 Lab Scientist Fellowship opportunity! Applications are due Dec. 15, 2016.


Enjoy photos from the 2016 CVT Workshop here!

10/19/16 CVT Workshop at the Michigan League Ballroom.

The Princeton team hosts Lt. Gen. Frank Klotz!

Klotz views a zero knowledge protocol experiment.

(left to right: Lt. Gen. Frank Klots (Ret.) and Sebastien Phillippe, CVT Graduate Associate)

NNSA administrator Lt. Gen. Frank Klotz (Ret.) visited with CVT researchers at Princeton where they presented their work on zero-knowledge verification as part of CVT. He was shown the experiments and had an opportunity to run a DT neutron generator and perform radiography with our bubble detectors. Read more here: https://nnsa.energy.gov/blog/nnsa-administrator-visits-princeton-plasma-physics-laboratory

Crystal Green, CVT Graduate Associate at the University of Michigan, receives Women of Color STEM Conference Leadership Award!


Save the date for the upcoming 2016 CVT Workshop!

Workshop Flier

University of Michigan PhD Candidate and CVT Graduate Associate, Marc Ruch, is recognized for best student paper at this year’s ANS conference for Advances in Nuclear Nonproliferation Technology & Policy Conference.


left to right: Mateusz Monterial, CVT Graduate Associate, Marc Ruch, CVT Graduate Associate, Professor Sara Pozzi.

Nature Communications features an article titled, “A physical zero-knowledge object-comparison system for nuclear warhead verification.” The research was led by members of our CVT team including Sébastien PhilippeRobert J. GoldstonAlexander Glaser, & Francesco d’Errico.

Zero-knowledge proofs are mathematical cryptographic methods to demonstrate the validity of a claim while providing no further information beyond the claim itself. The possibility of using such proofs to process classified and other sensitive physical data has attracted attention, especially in the field of nuclear arms control. Here we demonstrate a non-electronic fast neutron differential radiography technique using superheated emulsion detectors that can confirm that two objects are identical without revealing their geometry or composition. Such a technique could form the basis of a verification system that could confirm the authenticity of nuclear weapons without sharing any secret design information. More broadly, by demonstrating a physical zero-knowledge proof that can compare physical properties of objects, this experiment opens the door to developing other such secure proof-systems for other applications.

read more here!

CVT Graduate Associate, Jayson Vavrek, is featured in an MIT NSE article on his efforts with turning particle detectors into weapons detectors.

Nuclear Science and Engineering PhD student Jayson Vavrek applies his particle physics to solve problems with nuclear weapons disarmament.

Department of Nuclear Science and Engineering (NSE) graduate student Jayson Vavrek got his start in high-energy particle physics, looking for the smallest forms of matter in the universe. Now at MIT, he uses the same tools and principles to verify nuclear weapons.

The system Vavrek is developing, along with his advisor Areg Danagoulian, Assistant Professor of NSE, is called physical cryptography.

read more here!

CVT Graduate Students win Fuel Cycle Research Awards!

CVT Graduate Students, Marc Paff and Marc Ruch, have won awards in the 2015 Innovations in Fuel Cycle Research Awards sponsored by the U.S. Department of Enercy, Office of Fuel Cycle Technologies. Both students are PhD candidates in the Nuclear Engineering and radiological Sciences department at the University of Michigan. 

Marc Paff, a Ph.D. student in Nuclear Engineering and Radiological Sciences, has been awarded a First Place prize in the Open Competition in the category of Material Protection, Control, and Accountancy. His award-winning research paper, “Organic Liquid Scintillation Detectors for On-The-Fly Neutron/Gamma Alarming and Radionuclide Identification in a Pedestrian Radiation Portal Monitor,” was published in the journal Nuclear Instruments and Methods in Physics in July 2015.

Marc Ruch, a Ph.D. student in Nuclear Engineering and Radiological Sciences, has been awarded a Second Place prize in the Open Competition in the category of Material Protection, Control, and Accountancy. His award-winning research paper, “Pulse Shape Discrimination Performance of Stilbene Coupled to Low-Noise Silicon Photomultipliers,” was published in the journal Nuclear Instruments and Methods in Physics in September 2015.

For more information on the Innovations in Fuel Cycle Research Awards program, visit http://www.fuelcycleinnovations.org.

Congratulations to Dr. Shaun Clarke, CVT Assistant Director, who received the 2016 INMM Early Career Award!


Dr. Shaun Clarke (center) is accompanied by Dr. Corey Hinderstein (INMM Vice President, left) and Dr. Larry Satkowiak (INMM President, right).

Researchers develop a ‘physical cryptography’ for secure and accurate accounting of the world’s nuclear arsenals

Verifiably reducing the number of nuclear weapons in the world will require more than international diplomacy; a scientific breakthrough is needed. To date, all nuclear arms control treaties have been limited in a peculiar way: Participants cannot determine that the warheads of other countries being counted are real.

Are You Radioactive?

Shaun Clarke, CVT Assistant Director, with CVT students put on a workshop for middle school students and their families about the basics of radiation titled “Are you radioactive?”. Participants learn how to see and measure radiation, one of the most powerful and mysterious forces in the universe. Activities included building a radiation detector using everyday household objects to observe the natural radiation that is all around us.


Learn how to build your own Cloud Chamber!

2016 CVT Newsletter available here!

The CVT project has been making an impact in the field of nuclear non-proliferation! Find some highlights within this newsletter on ongoing projects, our award winning research team, and other notable accomplishments.

CVT Fellow, Ciara Sivels, has the winning poster for student competition at the UITI 2016 meeting. 


left to right: Matthew Marcath (CVT Student Associate), Professor Sara Pozzi (CVT Director), Shaun Clarke (CVT Assistant Director), Ciara Sivels (CVT Student Fellow), Michael Hamel (CVT Student Associate), Emily King (CVT Undergraduate Fellow), and Angela Di Fulvio (CVT Postdoc Fellow)

Elizabeth Hou, CVT Fellow, wins 1st place at the Michigan Institute for Computational Discovery and Engineering (MICDE) Poster Competition


The announcement and list of winners can be found here: 


Prof. Frank N. von Hippel in a NYT report

Professor Sara A. Pozzi is featured in “Celebrating Women in Physics” in this Elsevier Special Issue.

CVT_Workshop_2015-Oct16-01-PozziThis article features a compilation of  papers that have been authored by outstanding women scientists in high level Physics publications,  ranging across various disciplines, from Epitaxial growth of topological insulator Bi2Se3 film on Si(111) to the design of optimal light delivery system for co-registered transvaginal ultrasound and photoacoustic imaging of ovarian tissue. These articles were selected by the Editors of those respective publications.

Dr. Pozzi is being featured for her publication titled “MCNP-PoliMi: a Monte-Carlo code for correlation measurements“.

Read more here!

R. Scott Kemp receives prestigious Sloan Research Fellowship!

Awarded annually since 1955, the Sloan Research Fellowships are given to early-career scientists and scholars whose achievements and potential identify them as rising stars among the next generation of scientific leaders. This year’s recipients are drawn from 52 colleges and universities across the United States and Canada.

Read more here!

January 6 Explosion in North Korea

University of Michigan and other university scientists, part of the Consortium for Verification Technology (CVT), are studying the January 6, 2016 explosion in North Korea. The initial analysis of seismic signals performed by Paul Richards and Won-Young Kim at Columbia University’s Lamont-Doherty Earth Observatory found that this event is comparable in magnitude to those from the May 2009 and February 2013 nuclear weapons tests in North Korea (the October 2006 test is widely regarded as a fizzle). Richards and Kim are quoted in an article by CNBC. Other scientists have independently validated this conclusion. Regarding the North Korean claim that it has tested a thermonuclear weapon, CVT scientist Frank Von Hippel of Princeton says: “the seismic magnitude appears to be in the same range as the 2013 test, which was estimated to be of the order of 10 kilotons, it was not in the yield range that we usually associate with thermonuclear tests.” CVT scientist Alexander Glaser, also of Princeton, adds: “If radionuclides have been (or will be) vented from the underground test site, then nuclear forensic analysis may be able to substantiate or challenge North Korea’s claim about the nature of the device. “

CVT scientists Milton Garces (University of Hawaii) and John Lee (University of Michigan) are in the process of obtaining infrasound and radionuclide data, respectively, from the International Monitoring System. These data, together with the seismic data, will provide excellent research and educational opportunities for the faculty and students in the CVT.


Source: Paul Richards and Won-Young Kim, Columbia University’s Lamont-Doherty Earth Observatory



The Consortium for Verification Technology (CVT) is funded by the Defense Nuclear Non-Proliferation Research and Development office (DNN R&D) of the U.S. Department of Energy National Nuclear Security Administration under award #DE-NA0002534. The CVT consists of thirteen leading universities and nine national laboratories, working together to provide the research and development and human capital needed to address technology and policy issues in treaty-compliance monitoring. The underlying issues include nuclear nonproliferation and safeguards in support of the mission of the NNSA’s Defense Nuclear Nonproliferation Research and Development office. The university partners to the consortium are University of Michigan (UM), Massachusetts Institute of Technology (MIT), Princeton University, Columbia University, North Carolina State University (NCSU), University of Hawaii (UH), Pennsylvania State University (PSU), Duke University, University of Wisconsin (UW), University of Florida (UF), Oregon State University (OSU), Yale University, and University of Illinois at Urbana-Champaign (UIUC). The university participants will execute research projects in collaboration with the DOE national laboratories, including Brookhaven National Laboratory (BNL), Los Alamos National Laboratory (LANL), Lawrence Livermore National Laboratory (LLNL), Sandia National Laboratory (SNL), Idaho National Laboratory (INL), Oak Ridge National Laboratory (ORNL), Pacific Northwest National Laboratory (PNNL), Lawrence Berkeley National Laboratory (LBNL), and Princeton Plasma Physics Laboratory (PPPL). 

MCNP/MCNPX – PoliMi Workshop, 2016

The Consortium for Verification Technology (CVT) and the Consortiu for Nonproliferation Enabling Capabilities (CNEC) are hosting the Seventh MCNPX-PoliMi Training Workshop at the University of Michigan campus Johnson Rooms on June 21, 22, & 23, 2016. Seating is Limited. Registration will be accepted on first-come-first serve basis.

For more workshop information, visit our workshop details page here: http://cvt.engin.umich.edu/mcnpx-polimi-workshop-2016/

REGISTER ONLINEhttps://www.regonline.com/mcnpxpolimiworkshop2016

IAEA safeguards inspector at a gas centrifuge uranium enrichment plant

In this video, we follow an IAEA safeguards inspector at a gas centrifuge uranium enrichment plant in the Netherlands. Uranium enrichment, a process in which the proportion of fissile U-235 isotopes is increased from 0.71% to up to 6% for industrial use, is an essential step in the preparation of nuclear fuel. However, the nuclear material and technology at enrichment plants can also be used to manufacture weapons grade uranium (over 85%). The IAEA verifies that all nuclear material and activities are declared by the State, and that no nuclear material is diverted from peaceful purposes.

In the film, the inspector explains and demonstrates how she collects samples, checks inventories, and verifies enrichment levels – all to ensure that material is not being diverted to nuclear weapons or other nuclear explosive devices. Inspectors, equipment, techniques and technologies are critical components of IAEA safeguards. 

Student Feature: Ruaridh Macdonald, CVT Associate

Ruaridh Macdonald

“Energy is incredibly fundamental to life,” MIT graduate student Ruaridh Macdonald says. “That’s why I keep studying it.”

This tenet has been the thread throughout Macdonald’s nearly eight years at MIT — first as an undergraduate, then as a master’s student, and now as a PhD student — all spent studying nuclear science and engineering. Though he has remained engaged in this one department, he’s participated in a variety of projects, first studying reactor design as he pursued his master’s degree and now working on a nuclear weapons verification project in the Laboratory for Nuclear Security and Policy.

Read more about Ruaridh’s journey here: http://web.mit.edu/nse/news/spotlights/2015/ruaridh-macdonald.html

CVT Workshop at the Campus Inn, Ann Arbor, October 15, 2105.

A two day conference held October 15-16th marked the end of the first year of the Consortium for Verification Technology, a project comprised of 13 universities and nine national labs tasked with analyzing nuclear nonproliferation efforts and improvements in nuclear monitoring and detection technologies.

Click here to read more about this year’s workshop and view photos from the event!

Congratulations to the 2015 American Nuclear Society (ANS) Student Design Competition winners!


Left to Right: Brianne Heisinger, Crystal Green, Jennifer Nguyen, Kyle Kondrat, Matthew Krupcale, Prof. Ron Gilgenbach

The winning team includes CVT students (Crystal Green, Jennifer Nguyen, and Matthew Krupcale) from the University of Michigan. Their project “Zero Knowledge Active Interrogation of Nuclear Warheads” won in the Graduate Category. 

CVT holds a successful workshop!

CVT Workshop at the Campus Inn, Ann Arbor, October 15, 2105.

Above: Attendees at the 2015 CVT Workshop pose for a group photo on October 15, 2015.

The Consortium for Verification Technology held a very successful annual workshop on October 15th and 16th, 2015 at the Dahlmann Campus Inn in Ann Arbor, Michigan. The workshop was attended by 84 participants consisting of 47 professionals and 37 students. 36 talks and 21 posters were presented during the duration of the workshop. Of the 57 presentations, 16 talks and 17 posters were presented by CVT student and postdoctoral fellows and associates.

An interactive agenda provides pdf versions of the presentation material displayed at the workshop which can be accessed by clicking on the presentation title listed on the site here:

Sara Pozzi on Moving into the Ford Reactor Space

CVT Chief Scientist, Professor David Wehe, organized a two-day radiation detection and measurement short course.Wehe-RadiationDetection-02c

David Wehe teaches a Radiation Detection Short Course at the IEEE Nuclear Science Symposium, November 2015.

CVT Associate is a 2015 Young Mind Finalist!


Emily King, CVT Undergraduate Fellow at the University of Michigan, is selected as a 2015 Young Mind Awards Finalist! Emily’s video submission can be viewed on her profile page linked here

You can learn more about the Young Mind Awards by visiting their website: http://www.youngmindawards.com/



CVT Associate is recognized for outstanding internship work at PNNL


CVT Associate, Pin-Yu Chen, receives recognition for his outstanding work during a 2015 summer internship at PNNL. Pin-Yu is a student at the University of Michigan, Ann Arbor. Read more about his research at the lab here: http://www.pnnl.gov/science/highlights/highlight.asp?id=4103

See our OPPORTUNITIES page for information on our CVT/National Laboratory Collaboration program!

The CVT universities invite national laboratory scientists to spend time on campus researching with CVT faculty and students and participate in activities such as

  • serving on graduate student thesis committees,
  • teaching a short course on a topic of interest to verification technology and policy, or
  • presenting invited seminars and lectures.

The CVT will support up to 4 national laboratory scientists to spend up to two weeks researching at CVT universities in collaboration with faculty and students. Support includes transportation, lodging, and meal/incidentals expenses. A brief report will be submitted at the end of the appointment.

CVT fellows and faculty at 2015 DAF experiments

DAF 2015 Team

From left to right:  Jonathan Mueller (NCSU PostDoc), Michael Hamel (Michigan PhD student) , Prof. Sara Pozzi (Michigan), Kyle Polack (Michigan PhD student), Prof. John Mattingly (NCSU), David Goodman, (Michigan PhD student), Jason Newby (ORNL), Prof. Zhong He (Michigan), Michael Streicher (Michigan PhD student)

The Consortium for Verification Technology was successful in organizing the first university-led radiation measurement campaign at the Device Assembly Facility at the Nevada National Security Site. The goal of the experiments was to characterize the performance of three unique radiation imaging systems in the presence of large quantities of special nuclear material including 4.5 kg of weapons  grade plutonium and 13 kg of highly enriched uranium. The systems included a dual-particle scatter camera and a photon scatter and coded-aperture camera from the University of Michigan. The third imaging system was a coded-aperture neutron imaging system being developed at Oak Ridge National Laboratory. The week-long experiments provided excellent benchmark data and operational experience for each imaging system with sources that are not typically accessible to researchers. Four University of Michigan students took part in the experiments. 

CVT students earn recognition for design work from ANS!


Scientists write letter to President Obama in support of the recent Iran Nuclear Deal

Twenty-nine of the nation’s top scientists wrote to President Obama on Saturday in support of the deal, which calls for Iran to curb its nuclear program and allow inspections in return for an end to sanctions. You can read the letter herein.

CVT Associate Matthew Marcath is recognized as an  2015 Innovations in Fuel Cycle Research Award Winner! See the announcement here.

Photo Memories from UITI 2015!


CTBTO presentation by Paul Richards, “A Seismic Event in North Korea on 12 May 2010 – Claims, supporting evidence, and some discussion for a CTBT-relevant event”, June 2015

The University and Industry Technical Interchange (UITI), June 2 – 4, 2015

The University and Industry Technical Interchange 2015 (UITI 2015) review meeting is an opportunity to showcase the Office of Defense Nuclear Nonproliferation Research and Development’s (DNN R&D) funded research projects from universities, small businesses (SBIR & STTR), and their laboratory partners to the broader nuclear security and nonproliferation community. Consortium for Nuclear Science and Security, consortium for Verification Technology and consortium for Nonproliferation Enabling Capabilities will also be well represented. UITI is an unclassified venue for stakeholders within the community to engage sponsored researchers, as well as a forum to stimulate collaboration, technology transfer and integration. 50 technical presentations 100 posters from a variety of disciplines will be presented including:
radiation detection, advanced materials, remote sensing, safeguards and simulations, algorithms and modeling. In addition, the Department of Energy (DOE) National Laboratories will each provide an overview poster of their DNN R&D sponsored research programs. Representatives from U.S. government agencies involved in nuclear security and non-proliferation will be in attendance.

University of Michigan DNNG students and researchers present their research to Anne Harrington during a lab tour

AHarrington-All Students

Anne Harrington is Deputy Administrator for Defense Nuclear Nonproliferation for the National Nuclear Security Administration.

The University of Michigan welcomes Anne Harrington, Deputy Administrator for Defense Nuclear Nonproliferation National Nuclear Security Administration

event image

Anne will present her talk titled, “Policy and Technology: Can They Work Together to Miinimize Future Security Risks?”

View Dr. Lazar Supic’s video on “Enhancing gamma-ray detection and imaging characteristics in HPGe double-sides strip detectors employing signal decomposition algorithms” presented at the University of Michigan on March 9th, 2015

Professor Sara Pozzi visits LBNL

On February 3rd, 2015, Dr. Sara Pozzi presented her research on Scintillators for Nuclear Nonproliferation and Nuclear Physics Studies at a seminar at the Lawrence Berkeley National Lab.

Undergraduate Students at the University of Michigan learn detection techniques.


View Dr. Vogt’s presentation on “Detailed Modeling of Fission”

Ramona_Vogt-Photo-squareRamona Vogt

While there have been intense recent efforts to improve upon fission theory, this talk focuses on achieving the best possible phenomenological understanding of fission.

View Dr. Richards’ presentation on “Seismic Monitoring for Hundreds of Earthquakes per day and for the occasional nuclear explosion.”

paul_richards-Photo-squarePaul Richards

Paul conducts research on the theory of seismic wave propagation, the physics of earthquakes, the interior structure of the earth, and the application of seismological methods to explosion and earthquake monitoring. 

Memorable Moments from the CVT Kick-off Workshop

CVT Kick-off Workshop a Success!! 

The Consortium for Verification Technology held a very successful Kickoff Workshop on October 16 and 17 at the Campus Inn in Ann Arbor, MI. A total of 58 representatives from 13 collaborating universities and 9 national laboratories were present, including 10 CVT fellows (PhD students and post-doctoral researchers). Four representatives from DOE NNSA were also in attendance. The participants are internationally recognized leaders in the field of nuclear nonproliferation and safeguards. The workshop agenda included 26 oral presentation from faculty participants, 9 presentations on the national laboratory capabilities, and 10 poster presentations from the CVT fellows. The CVT is led by Professor Sara Pozzi from University of Michigan and represents a 25 M$/5 year investment by DOE to address the pressing needs in nuclear treaty verification and develop the next generation of experts in this field.



The Consortium for Verification Technology (CVT), consists of thirteen leading universities and nine national laboratories, working together to provide the research and development and human capital needed to address technology and policy issues in treaty-compliance monitoring. (read more)


pozzi-leadershipThe institutions and key personnel selected for this effort have a record of excellence in the areas of interest to the CVT. These researchers and educators are fully committed to the development of the next-generation of nuclear science professionals.

We selected a diverse group of professors, at various stages in their careers, leading research groups in geographically distributed, large and small departments. (read more) 

NNSA_LogoWe gratefully acknowledge the Department of Energy, National Nuclear Security Administration, NA-22, for funding the Consortium for Verification Technology!