Radiation application technologies used for countermeasures against Fukushima Daiichi Nuclear Power Station accident

Radiation application technologies had contributed to countermeasures against Fukushima Daiichi Nuclear Power Station Accident. After the accident, such activities had been continued to assure the safety of damaged cores towards the settlement of the accident and countermeasures against radioactive materials discharged and diffused into the environment. As for recovery and removal of radioactive materials in the environment, development of cesium adsorbent using graft polymerization and trial of environmental restoration of agricultural land using plant breeding suitable for cesium absorption had been started. Database was available for evaluation of radiation resistance of polymer materials and equipments. Related with general-purpose cranes and robots used under high radiation environment, guideline of radiation life assessment of universal electric parts was proposed to limit total radiation doses. Radiation resistance of semiconductor devices of electric parts used for Quince robots was tested at cobalt 60 gamma-ray irradiation facility. Radiolysis of boiling pure water was tested under gamma-ray irradiation to clarify hydrogen generation mechanism. (T. Tanaka)