How much liquid hydrogen to stop neutron radiation?

I have a spaceship that's powered by an efficient hydrogen fusion drive, but the drive outputs a large amount of dangerous neutron radiation as a side effect, and those neutrons are not captured and directed away from the ship by its magnetic nozzle. Fortunately, my research indicates that hydrogen-based compounds can efficiently block neutrons, and liquid hydrogen is certainly hydrogen-based, so I plan to have the ship use its own reserve fuel as radiation shielding.

Question: How deep would a container of liquid hydrogen have to be to reliably stop neutron radiation?

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How much liquid hydrogen to stop neutron radiation?

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