The Japan Radioisotope Association (日本アイソトープ協会) (JRIA) is the oldest and largest professional association related to radioisotope and radiation research in Japan. The JRIA was made into a public utility corporation by the government of Japan. Founded in 1951, the JRIA now has more than 3,500 members. The president is Akito Arima. The Nishina Memorial Cyclotron Center of JRIA is operated for cooperative research projects of all institutions in Japan. The Kaya Memorial Takizawa Laboratory of JRIA was established to treat all medical radioactive wastes.