**About the Editors**

## **Shinji Tokonami**

Professor Shinji Tokonami is director of the Institute of Radiation Emergency Medicine, Hirosaki University, Japan. He specializes in radiation measurement and dose assessment. In 1995, Dr. Tokonami earned his Ph.D. in engineering from Waseda University. Throughout his career he has been involved with radiation research at Waseda University, the National Institute of Radiological Sciences, and Hirosaki University. In addition, he is a member of several International Organizations for Standards'committees regarding radon and radiation measurements. Dr. Tokonami also developed multiple measurement techniques and equipment related to his field. In particular, he established a passive measurement technique for detecting radon-222 and radon-220. This discriminative measurement technique for radon isotopes was published as ISO 16641.

#### **Ikuo Kashiwakura**

Professor Ikuo Kashiwakrua is the Vice President of Hirosaki University, Japan and is in charge of radiation emergency medicine-related activities. In addition, his specialty is radiation biology, especially on radiation's effects on the differentiation and proliferation of hematopoietic stem cells and the development of radiomitigative protocols. Dr. Kashiwakura earned his Ph.D. in Pharmacology from Hokkaido Pharmaceutical University School of Pharmacy. Throughout his career he has been involved with radiation education and research at Hokkaido Pharmaceutical University School of Pharmacy and Hirosaki University for about 40 years. Meanwhile, he served as a program officer of the Science Center for Science Systems established within JSPS for three years (2009–2011). Currently, his research is focusing on the development of radiomitigative protocols utilizing domestically approved pharmaceutical drugs.
