An extreame disposition method for low-level radioactive wastes using supercritical water (3)

Wataru Sugiyama, Tomoo Yamamura, Ki Chul Park, Hiroshi Tomiyasu, Yoshinobu Shiokawa, Hidetsugu Okada, Yuji Sugita

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Disposition of low-level radioactive wastes has been performed in supercritical water with RuO2 as a catalyst without the addition of any oxidizing materials. These wastes arose from nuclear power plants etc., constituting of nonflammable organic materials, such as fire resistant sheeting and rubber gloves. We investigated the distribution behavior of iron and cobalt attached to nonflammable organic materials, in solid, liquid and gas phases during the decomposition of this method. The distributions of these elements under various conditions (initial amounts) were determined by using their radioisotopes as simulated low-level radioactive wastes in order to ease the detection of trace amounts of elements even in solid and gas phases. Iron and cobalt were found only in the solid phase when non-radioactive iron hydroxide was added as a precipitation reagent before the supercritical-water reaction.

Original languageEnglish
Pages (from-to)448-453
Number of pages6
JournalProgress in Nuclear Energy
Issue number1-4
Publication statusPublished - 2005 Jul


  • Disposition
  • Low-level radioactive wastes
  • Radiometric analysis
  • Recovery of radioactivity as solids
  • Supercritical water

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Safety, Risk, Reliability and Quality
  • Energy Engineering and Power Technology
  • Waste Management and Disposal


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