The absorption depth was a quality of some alloys, measured in particles per micron.

The osmium alloy found in Enterprise NX-01's catwalk had an absorption depth of at least twenty thousand particles per micron, according to Trip Tucker. In 2152, Doctor Phlox believed it to be adequate protection against the radiolytic isotopes present in a neutronic wavefront. (ENT: "The Catwalk")

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