Neutron and Gamma Measurements During a
Verification Experiment in Switzerland

In March 2023, the UN Institute of Disarmament Research held a verification experiment that included a mockup onsite inspection at a former military facility in Menzingen, Switzerland. The project was supported by the governments of Switzerland, Norway, and the Netherlands. Logistical support was provided by the Swiss Armed Forces. The experiment included a visit to the site by an inspection team, accompanied by the host team. Among other activities, radiation measurements were used to confirm the non-nuclear nature of items located inside the object of verification. In this paper, we discuss the gamma and neutron measurement systems used during the experiment and the inspection protocols followed to confirm the absence of nuclear weapons.