So, what was it? It was suggested by several commentators that an arms depot that had been hit contained the Depleted Uranium (DU) weapons sent by the UK to the Ukraine for use in the British Challenger tanks as anti-tank penetrators. That the explosion was one involving the burning of the DU in the fireball. Since I am a scientific authority on Uranium and its health effects, but have also examined its dispersion and behaviour in the environment, I will comment on what I believe happened, and why it is important. I was a member of the UK government Ministry of Defence Depleted Uranium Oversight Board (DUOB) in 2000-2005, and also the UK government Committee Examining Radiation Risk from Internal Emitters (CERRIE) 2000-2004. I am Scientific Secretary of the European Committee on Radiation Risk (ECRR) which is an independent NGO that provides advice on risk from ionising radiation.

What you need to know is that Uranium 238, when it decays with its alpha emission, turns into Thorium-234 and Protoactinium-234m which then turns into Uranium 234. Thorium 234 is a beta and gamma emitter delivering 6% of its decay energy as a gamma ray. Thus, large clouds of DU particulate aerosol will be detectable by gamma detectors.

When I visited Iraq with Al Jazeera in 2000 I went to the south and examined the corpses of the tanks that had been hit by DU in the first Gulf War. Some of the A-10 DU penetrators were still lying around. They gave off an intense gamma ray signal, and the holes in the tanks were highly gamma ray active. So much for only an alpha emitter.
I am a yachtsman: examination of the UK metereological weather pressure maps tell us that at the time, and for days after the explosion, there was an anticyclone to the North of the explosion site and winds were weak but from the South East blowing North Westerly around the high-pressure area. So, the plume would move towards Poland. If the winds were about 5km/h they would reach any Poland detectors 250 km away on the 15th.

Ukraine’s Depleted Uranium Blast: Europe on Brink of ‘Environmental Disaster’ | The Most Revolutionary Act