A nuclear test is carried out on an island in French Polynesia in 1971. Credit: CTBTO
By Tariq Rauf
VIENNA, Austria, Aug 7 2025 – On 16th July this year I was at the University of Chicago, attending a Nobel Laureate Assembly, and visited the site where at 15:25 PM local time on 2 December 1942, the nuclear physicist Enrico Fermi achieved the first self-sustaining atomic fission chain reaction.
Three years later, at precisely 5:30 PM on 16 July 1945, the nuclear age began with the detonation of the “Trinity” nuclear explosive device over the New Mexico desert.
At approximately 8:15 AM Hiroshima time on 6 August 1945, the US Air Force unleashed the “Little Boy”, a 9,700-pound uranium gun-type bomb, over the city. While no one will ever know for certain how many died as a result of the nuclear bombing of Hiroshima, it is estimated at least 70,000 people perished as a result of initial blast, heat and radiation effects.
Three days later, on 9 August 1945, at 11:02 AM, the US Air Force at an altitude of 1,650 feet detonated the plutonium device “Fat Man”, with an estimated explosive yield of 21,000 tonnes (kilotons), about 40 percent greater than that of the Hiroshima bomb. It is estimated that about 40,000 people perished initially, with 60,000 more injured.
By January 1946, the number of deaths in both Hiroshima and Nagasaki exceeded more than 150,000, with perhaps ultimately twice that number dead within the ensuing five years.
Between 16 July 1945 and 3 December 2017, it is estimated that 2,121 nuclear test detonations involving 2,476 nuclear explosive devices have been carried out by ten States – in chronological order: USA, USSR, UK, France, China, India, Israel/South Africa, Pakistan and North Korea.
Though the 1996 Comprehensive Nuclear Test-Ban Treaty (CTBT) prohibits all nuclear test detonations, in all environments, and has been signed to date by 187 States and ratified by 178, it still languishes having not entered into force.
In particular, entry-into-force depends on 44 named States to have ratified. Nine such States are holding up entry into force: alphabetically, China, Egypt, India, Iran, Israel, North Korea, Pakistan, Russia, and USA. Indonesia was the latest among this group of 44 States to have ratified in February 2012 – since then not a single State among the remaining nine has taken any steps to sign and/or ratify the CTBT, placing its future in doubt.
While the CTBT prohibits all nuclear testing once in force, nevertheless it has created a powerful global norm against further nuclear test detonations. On the other hand, all nine current nuclear-armed States are modernizing their nuclear explosive devices (warheads), in one way or another, and their nuclear weapon engineers and scientists direly would like to resume some limited explosive testing to validate new designs and certify older existing ones.
Only the CTBT stands in their way. Were any one of the nine nuclear-armed States to resume nuclear test detonations, it is quite probable that others would follow. Though not confirmed, it is speculated that pressure to test nuclear devices likely is strongest in India, followed by Russia, China, North Korea, Pakistan and the United States.
The United States and Russia both have advanced technical programmes utilizing quantum computing for advanced simulation and testing to non-explosively certify existing nuclear warheads for safety and reliability, and validate new designs. Nonetheless, nuclear warhead designers ideally would like to detonate new designs for certification, safety and reliability.
In conclusion, the moratorium on nuclear test detonations is hanging by a slender thread in these troubled times of exacerbated tensions between the United States versus China and Russia, India versus China and Pakistan, and North Korea in the Korean Peninsula. Were there to be “friendly” nuclear proliferation by States such as Germany, Poland, or South Korea; or new nuclear States to emerge such as Iran and Taiwan (China), the spectre of nuclear explosive testing once again could arise.
We are living in lawless times internationally, of might over right; it remains a perilous challenge to sustain existing global nuclear arms control and disarmament norms including those against nuclear test detonations.
The views expressed in this article are personal comments by Tariq Rauf, former Head of Verification and Security Policy at the Vienna-based International Atomic Energy Agency (IAEA).
IPS UN Bureau
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