After the accident of the Fukushima Daiichi Nuclear Power Station, radioactive cesium has been heterogeneously distributed in surface soil due to the existence of radioactive microparticles and clay minerals. Therefore, the selective removal of these microparticles will lead to the volume reduction of contaminated soil. The present study examines methods for selectively removing radioactive microparticles from soil. Also, in order to reduce the volume of contaminated soil, we search a possibility to practically apply the separation method that uses the difference in specific gravity of particles (heavy liquid separation method).
福島第一原子力発電所の事故では、放射性微粒子や粘土鉱物の存在により、放射性セシウムは 表層土壌において不均一に存在することが分かっている。このため、これらの粒子を選択的に取 り除くことで汚染土壌の減容に繋がると考えられる。本研究は、放射性微粒子を選択的に土壌か ら取り除く手法の検討や、土壌の減容を目的とした、粒子の比重の違いを利用した分離法（重液 分離法）の実用化の可能性について探る。
After the accident of the Fukushima Daiichi Nuclear Power Station, radioactive cesium has been heterogeneously distributed in surface soil due to the existence of radioactive microparticles and clay minerals. Therefore, the selective removal of these microparticles will lead to the volume reduction of contaminated soil. The present study examines methods for selectively removing radioactive microparticles from soil. Also, in order to reduce the volume of contaminated soil, we search a possibility to practically apply the separation method that uses the difference in specific gravity of particles (heavy liquid separation method).