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Herman Anderson

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Deuterium is a hydrogen atom with an extra neutron

When hydrogen loses its electron, the following cations can be formed:

Hydron: general name referring to the positive ion of any hydrogen isotope (H+)
Proton: 1H+ (i.e. the cation of protium)
Deuteron: 2H+, D+
Triton: 3H+, T+
In addition, the ions produced by the reaction of these cations with water as well as their hydrates are called hydrogen ions:

Hydronium ion: H3O+
Zundel cation: H5O2+ (named for Georg Zundel)
Eigen cation: H9O4+ (named for Manfred Eigen)
Zundel cations and Eigen cations play an important role in proton diffusion according to the Grotthuss mechanism.

Neutron moderator
In nuclear engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235 or a similar fissile nuclide.

Commonly used moderators include regular (light) water (roughly 75% of the world's reactors)

This suggests that a few decimeters of water is pretty efficient at moderating fast neutrons down to room temperature, but a few meters are required to completely convert thermal neutrons into gamma rays due to capture on hydrogen (energy 2 MeV). A few meters of water is pretty efficient at turning gamma rays into heat.

Termal neutron capturing during electrolysis.

Potassium hydroxy mol has 20 neutron and 19 electrons and 19 protons.


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