放ほう射しゃ性せい降こう下か物ぶつ

noun

radioactive fallout

Technical term used in nuclear physics, environmental science, and disaster contexts. Refers to radioactive particles that fall to the ground after a nuclear explosion or accident.

• 放ほう射しゃ性せい降こう下か物ぶつの拡かく散さんを予よ測そくするシミュレーションが行おこなわれた。

  A simulation was conducted to predict the spread of radioactive fallout.

• 原げん発ぱつ事じ故こ後ご、広こう範はん囲いで放ほう射しゃ性せい降こう下か物ぶつが検けん出しゅつされた。

  After the nuclear accident, radioactive fallout was detected over a wide area.