Progress on securing weapons-usable nuclear materials around the globe has slowed in the past two years, ending a period of substantial improvement from 2012 to 2018, according to a new report from the Nuclear Threat Initiative (NTI), a nongovernmental organization based in Washington, DC. For a fifth straight time in their biennial nuclear security report, NTI researchers ranked Australia as the top country for the strength of its measures to protect weapons-usable materials. Receiving 93 of a possible 100 points on the Nuclear Security Index, Australia possesses 1–10 kg of highly enriched uranium (HEU), according to the International Panel on Fissile Materials (IPFM). That is well below the 25 kg that the NTI says is the minimum amount required to fashion a crude nuclear device.
Physics Today 10th Aug 2020 read more »