[zaarn]

Neutron radiation is in fact ionizing radiation.

It is much more dangerous than other types, as it readily passes most materials, yet dosage is absorbed. Absorbed neutrons cause particles to (almost always) become radioactive, which causes havoc as those new radioactive particles decay.

The other common types of radiation (alpha, beta and gamma) do not cause things to become radioactive (usually), instead they are a threat if the actually radioactive material accumulates as dust on your skin (for example).

Neutron radiation is much more dangerous because it seeds radioactivity deep in the body, so you can't clean it off by washing or waiting for the absorbed particles to be flushed back out of the body naturally within a few days.