Japan Atomic Energy Research Institute

Yoshihide Komaki

Isao Kaetsu

Minoru Kumakura

Kenji Motojima

Kazuya Suzuki

Matae Iwasaki

Yasuji Sejima

Tsutomu Sakurai

Takashi Ohno

Katsuaki Ichiyanagi

Toshiyuki Itoh

Ryuji Arai

Hideo Kohyama

In order to make hard and soft contact lenses having a pore diameter and a pore density optimum for use as oxygen permeable contact lenses, the contact lens after molding is subjected to irradiation of a polyvalent heavy ion beam having a mass number of 2 to 100 (preferably 10 to 80) and an ion energy of 10M eV (preferably 50M eV) or higher, at an ion radiation density of 10 to 10.sup.9 ions/cm.sup.2 (preferably 10.sub.2 to 10.sub.5 ions/cm.sup.2) and thereafter ultrasonically etched (preferably at 10 to 50 MHz) at a temperature of 4 to 50.degree. C. (preferably 10.degree. to 30.degree. C.) in the presence of chloroacetic acid (preferably tricholoracetic acid).

Porous contact lens and method for making it

A novel process and an apparatus are herein disclosed for separating molybdenum-99 from irradiated uranium.

Volitilization process for separation of molybdenum-99 from irradiated

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Katsuta, Japan

Yoshihide Komaki