Doryokuro Kakunenryo Kaihatsu Jigyodan

Ngk Insulators, Inc.

Takao Akiyama

Yoshihiko Kurashima

Shunji Inoue

Yoichi Karita

Yoichi Miyamoto

Satoru Takani

Hideo Atsumo

A process for treating a radioactive waste, includes drying a radioactive waste containing a radioactive substance(s) and a sodium compound(s), to convert it into a dried material, heating the dried material to convert it into a molten salt, and subjecting the molten salt to electrolysis using the salt as an anolyte and .beta.-alumina as a sodium ion-permeable membrane. This process can recover metallic sodium or sodium hydroxide, each of extremely low radioactivity from a radioactive waste containing a radioactive substance(s) and a sodium compound(s), at a high purity at a high current efficiency.

Process for treatment of radioactive waste

A method and an apparatus for continuously measuring the hydrogen concentration in argon gas containing hydrogen and other impurities. The argon gas containing impurities is continuously passed through a high temperature metal getter to thereby remove impurities other than hydrogen from the argon gas and produce a two-component mixture of gases consisting of argon and hydrogen. The two-component gas is then continuously introduced to a thermal conductivity detector and the hydrogen concentration can be determined from the detected thermal conductivity.

Method and apparatus for continuously measuring hydrogen concentration

Growing community of inventors

Mito, Japan

Takao Akiyama