I do not know if the weapon is succefully done, if produce enough high energy neutrons or even exist because I did not understand the video because of language. (Most of it tells the technical basics, thats for sure.)
I want to add one thing for sure. There is no one type of radiation.
Considering the radiation as ionising radiation we have a few types.
First one is ionising electromagnetic radiation. That is the radiation more energetic than violet light. Most of UV band, X rays, Gamma rays and extremly eergetic cosmic gamma rays are at this scale. We can shield ourselves with a solid and protect ourselves. Ordinary glass is enough for UV, lead is effective for more energetic rays.
Ionising particle radiation is another problem. Beta and alpha radiation is not so serious if the material radiates outside your body. But they are very dangerous inside your body. (Looking at 100 microgram of pollonium 210 is not a problem but if you inject it your body I advise you to shoot yourself at the head in 48 hours. At least thats a better death.)
There are more types I can write but to keep things simple; tanks are protected against those and even that protection is just realtive protection. (Do not trust that protection anytime, at least I wouldn't)
Neutrons are totally a diffirent story. They reaaly do not interract with matter as much as particles like protons or photons do. It is hard to stop them. Generally materials include hidrojen and carbon used to shield them but you will need a really thick layer of water with organic matter dissolved in it. (like humic acids because they include a lot of H and C and easy to find and produce) I am talking about meters in every dimention for an effective shield. To do that you will need a very very big aquarium with wheels that will carry the tank. When you want to fire, you will need to extract the tank from aquarium. Not practical I think.
Radiation shields stop a definite amount of radiation. For example if your shield stops %90 of 2 MeV gamma rays and if there is enough gamma rays to kill you with %10 then your shield will not make a diffirence. If total photon flux is the same and shield is effective at that flux it is ok.(When %10 do not do short term harm) But with the same flux if there is 10 MeV gamma rays then you are done because your shield will stop less photons now and gamma rays will pass the shield like there is no shield.
With neutrons last scenario happens. A shield ptotecting you from electromagnetic radiation, alpha, beta and protecting you from radioactive material by blocking it so it do not get inside you have radiation shield for alpha, beta, EM radiation and nuclear fallout. If there is no much neutron radiation around it is ok for short term. At least you can fight for a time. If there is enough neutrons to penetrate, then you are done. Because there is no way to effectivly protect an armoured vehicle from high flux high energy neutrons without using a ship size aquarium. (And some koi fish if you use japanese tanks.
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