VT Nuclear Education – Freon and the Hohlraum


by Ian Greenhalgh with Jeff Smith

melted alumnium radiator
The remains of a car in Tianjin. Note the completely melted aluminium radiator.

One of the key pieces of evidence that allowed the experts at VT to identify the aftermath of nuclear explosions in Tianjin was the presence of large numbers of cars that had been burned out in a manner which could not have been caused by any conventional fire, but rather, is the result of radiation.

In our article Confirmation – Tianjin Was Nuked we briefly covered the incineration of the radiators and cooling systems of the cars and mentioned that this was due to the presence of freon gas in the cooling systems and when stuck by the radiation of a nuclear blast, this Freon acted like the secondary core of a classic hydrogen bomb.

In this article, we give you the technical information to better understand what happens when a nuclear explosion irradiates a modern car. We believe that it is important to get this information into the public domain as it will arm people with the knowledge to be able to identify the use of nuclear weapons in future and maybe this will make it harder for those that use them to get away with it.

The Hohlraum. How Freon is imploded in a car air conditioning system by a neutron bomb.

After a neutron and/or a classical fission bomb is detonated the expanding neutron/x-ray radiation field emitted from the device will eventually strike any object within its radiation field pattern. If any sealed container that is filled with a hydrogen based fissionable fuel such as Freon or Propane is placed within close enough proximity of the blast it will act as a black body radiation case. This radiation case or what is called a Hohlraum in nuclear physics will act as a secondary fusion container compressing and fusing the internally confined hydrogen fuel and it will ignition it producing a low level fusion reaction.

The cars air conditioning system acts as a radiation case and the envelope of a secondary ignition system. If the metal casing of the cars cooling system is (acting as the pusher/tamper) made of heavy materials opaque to x-rays, and the remaining space within the radiation case (the hohlraum) is filled with light-weight materials transparent to x-rays; such as freon,as the primary fissions, large amounts of x-rays are radiated ahead of the blast and instantaneously fill the hohlraum with x-rays. Radiation trapped within the hohlraum rapidly reaches its equilibrium black-body spectrum and turns the hohlraum into a hot plasma.

The radiation-driven thermalization insures that this plasma has very uniform pressure and temperature so that its effects on the casing are the same from all sides; the plasma re-radiates longer wavelength x-rays that are absorbed by the surface of the metal casing; the surface of the secondary (the pusher/tamper acting as the cars radiator) is heated to the point where it vaporizes and material is ejected from it; the material ablated from the pusher/tamper causes by reaction produces a pressure which pushes the tamper inwards, imploding the freon to very high densities.

A crucial idea in Teller-Ulam method of nuclear fusion is the use of a radiation-heated low density plasma as a buffer to create very uniform driving conditions to compress the secondary equally and simultaneously form all sides. The role of the buffer (freon)is then played by thermalized blackbody radiation. The advantage of the low density filling (Freon) gas is that it allows energy from the primary blast to be stored as plasma thermal energy, which may later be re-released to the secondary to drive an ablation process. This is important as the primary (the neutron bomb) is a time-varying radiation source with a time dependence which is not optimum for adiabatic compression. Moreover, since the x-ray pulse from the primary is of relatively short duration, energy storage allows longer-sustained compression of the fusion fuel to a higher compression level.

A remarkable thing about the Teller-Ulam method is that the resulting compression mechanism is very simple and effective, even though it is based on a
very complex radiation transport process. In order to prove that radiation-driven ablative compression can be used to compress a small amount of fusion fuel such as Freon gas in a cars cooling system, some estimate of the ablation pressure is required. Such an estimate is provided by the observation that, in first approximation, the exploding boundary layer at the surface of the pusher is a plasma whose temperature is determined by the hohlraum temperature and whose density is equal to the pusher density.

To compress a deuterium based fuel to 300 times its solid density requires a pressure of 150 TPa (1500 megabars). If the pusher is made of heavy metal such as stainless steel, we find that the corresponding hohlraum temperature has to be only on the order of 0.4 keV. to achieve compression.

The hohlraum temperature needed to drive ablative compression is therefore on the order of 0.2 to 2 keV. This is lower than the maximum temperature of a fission explosion, which can therefore be used as the energy source for that purpose. Moreover, this temperature range is compatible with a hohlraum filling made of a low-density low-Z material such as freon.

Because of the intense neutron background resulting from the explosion of the primary weapon a fission / fusion chain reaction starts in the hohlraum as soon as it becomes critical. Hence, when the newly transformed thermonuclear fuel is imploded to its maximum density. It will then provide, in the form of x-rays, neutrons and additional compression from within, a large amount of energy sufficient to insure that ignition of the Freon will start.

Heating of the fuel to thermonuclear ignition is achieved during compression by hydrodynamic conversion of kinetic energy into thermal energy. For instance, the concept relies on the formation of a hot spot in the center of the imploding fuel where the decelerating motion of the material is converted into heat. If the temperature is high enough, the hot spot ignites and initiates a thermonuclear burn wave that propagates to the outer cold fuel layers. In the case of DF, This is what the Freon eventually turns into. The hot spot ignition temperature is about 10 keV. To obtain such high central temperatures, the implosion has to be very symmetric and the time-dependence of the ablation pressure has to have a very precise profile in order for compression to be adiabatic. But in the other hydrodynamic mode, volume ignition, it is much less demanding. In effect, provided radiation flux is high and fast enough,

The minimum thermal compression of the secondary can be estimated by supposing that the time-integrated neutron flux is equal to the fusion neutron flux crossing the compressed fuel boundary, plus the (n, 2n) and fast-fission neutron fluxes produced by these neutrons in the casing, assuming that all non-fusion neutrons are produced in a narrow layer at a radius equal to the compressed deuterium radius. Since the number of neutrons is given by the yield, and the flux by reference, the compressed deuterium radius is equal to about 2.7 cm. In cylindrical geometry, this corresponds to a geometrical compression factor (30/2.7)2 ≈ 120, i.e., a compression of the freon gas to a density about 100 times higher than its normal density.

The minimum required yield of a primary weapon needed to ignite the hydrogen based fuel is determined by the energy required to compress the secondary by a given factor. For compression factors of 300, i.e., ρD = 53 the adiabatic compression energies are about 3’000 MJ/kg,in total. The typical energy content of a chemical explosive is 5 MJ/kg. Hence,the minimum radiation energy required to ignite the Freon is equivalent to the energy of about 0.6 kt of high explosives at a given distance of less than 1,000 meters distance. Assuming that the conversion of primary energy into hohlraum plasma energy is 10% or better.

This means that any small nuclear device greater than about 1kt in explosive power will produce enough radiation energy to ignite almost any hydrogen base gas such as freon, propane, butane etc. that is stored in a proper high density metal container or radiator system and can be split into H2 or deuterium fuel.

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Ian Greenhalgh

Ian Greenhalgh is a photographer and historian with a particular interest in military history and the real causes of conflicts.

His studies in history and background in the media industry have given him a keen insight into the use of mass media as a creator of conflict in the modern world.

His favored areas of study include state sponsored terrorism, media manufactured reality and the role of intelligence services in manipulation of populations and the perception of events.

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  1. After Chelyabinsk Yoichi Shimatsu ran an article stating that the US had a space battleship armed with titanium “Rids of God”. I cannot lightly dismiss Mr. Shimatsu. Take a look at the Russian intercept of that event on youtube.After Tianjin he tojd the story of a ‘procyron – a Tesla style EM bomb that made no sound and vaporized a Japanese car carrier in Norway in 1995. Interesting read
    The world’s most prolific bombers are obviously Zion..

  2. What are these untouched, shiny cars in the background of the picture? Is the car park used by some people as soon after the blast?

  3. A further thought on my comment: Toyota had car destroyed by this blast. I believe other car makers had some of the destroyed cars. These car companies carry insurance, insurance that covers shipments and storage. Virtually all commercial property and casualty policies exclude damages caused by nuclear bombs. The insurance companies and their re-insurers are likely world wide, Lloyds, American, and maybe some European insurers. What will the underwriters do when presented with claims for these losses?

    • It might be significant that Tianjin is only 90 miles from Beijing, the Chinese capitol. Can we expect the rulers there not to insist on learning the perpetrator of this blast, and react?

  4. I don’t believe that rectangular plate with the hole in it was part of the radiator. Doesn’t change why the cars burned.

    I am wondering why that car is almost not there and on each side you can still see something that looks like a car. Acura’s NSX was all aluminum, maybe the car in the picture was also.

  5. Dmitri was initially told of a buried nuke by the Soviet government. Since that time, however, and prior to his imprisonment, we have all shared information.

    Long story here of cooperation and science winning out over Truther type agonizing self aggrandizement.

    • The steel top plate of the radiator is lying on the ground, it has a hole in it on the left side. The rest of the radiator is aluminium and coper and has been turned into white-grey ash.

  6. Thanks to VT and Dmitri Khalezov we now know there were tons of freon in the twin towers and those strangely burnt parked cars were due to the event having been Nucular ( Bush you hear ?).

    • Apparently to the United Nazion the 9/11 was a non-event.
      At least the US Government had an official ‘9/11 Commission’ to engage in critical ommission of the event but the UN had none whatsoever, as if it never happened.

    • Actually what Dimitri says in “911thology” is a bit different. Of course the destruction of the towers was nuclear, but according to him it was made with deeply buried, big (150 kt) thermonuclear devices (something that was part of a built-in demolition mechanism, NOT a “terrorist nuke”). In this case radiation is almost absent at ground level.

      According to him strangely burned cars were “faked” immediately after the destruction by secret services, because there were 2 levels of “explanation” (all of them lies) prepared by the government : one for the soccer-mum that we all know, with box-cutter muslim terrorists and kerosene fires triggering the “pancake-collapse” of the towers, and another one for “high-ranking” people where it was allowed to “understand” that those terrorists had indeed real “mini-nukes” and that the towers collapsed because of the nukes.

      Each of these “explanations” were made to prevent people thinking about the real thing : it was their own government who decided to destroy the Twin Towers (and, after that, WTC7) thanks to the nuclear built-in demolition mechanism (although, according to Khalezov, that silly decision was made in the panic to prevent a much greater disaster).

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