noun
subcritical nuclear experiment
Technical term used in nuclear non-proliferation and arms control contexts. Refers to experiments that stay below the threshold of a self-sustaining chain reaction.
臨界前核実験は核実験禁止条約の抜け穴として批判されることがある。
Subcritical nuclear experiments are sometimes criticized as a loophole in nuclear test ban treaties.
核実験 is a general term for any nuclear test, including full-scale explosions. 臨界前核実験 specifically refers to subcritical tests that do not produce a self-sustaining chain reaction.
Compound of 臨界 (criticality) + 前 (before, sub-) + 核 (nuclear) + 実験 (experiment). A modern technical term with no historical derivation beyond its components.